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Controlling Polymer Network Topology
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Book Synopsis Controlling Polymer Network Topology by : Yuwei Gu (Ph.D.)
Download or read book Controlling Polymer Network Topology written by Yuwei Gu (Ph.D.) and published by . This book was released on 2019 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 1: Introduction to Polymer Network Topology on a (Macro)Molecular Level Polymer network topology, comprising the ways in which strands and junctions are connected in polymer networks, plays a critical role in dictating many material properties. Here we discuss classical challenges in the field and review existing strategies to characterize and manipulate polymer network topology from a (macro)molecular level. Chapter 2: Semibatch Monomer Addition as a General Method to Tune and Enhance the Mechanics of Polymer Networks via Loop-defect Control In this chapter we introduce semibatch monomer addition as a general strategy to reduce/control an important topological feature at short length scale-primary loops, thus providing materials with tunable and significantly improved mechanical properties without changing their composition. Chapter 3: Leaving Groups as Traceless Topological Modifiers for Controlling Topological Structure in Chemically Identical Polymer Networks Here we report "traceless topological modification" as a general approach to control an important long length-scale topological feature-junction distribution. Using self-assembled structures as templates that are not themselves incorporated into the network, our method enables us to synthesize truly topologically isomeric networks with drastically different macroscopic properties. Chapter 4: Photoswitching Topology in Polymer Networks with Metal-Organic Cages as Crosslinks Based on our works in Chapter 2 and Chapter 3, we further explored topology as the central design principle to create novel functional materials. In this chapter we introduce topology switching via cooperative self-assembly as a design principle to reversibly alter multiple network properties simultaneously and enable the preparation of one material that can exist in multiple topological states. Chapter 5: Living Additive Manufacturing: Transformation of Parent Gels into Diversely Functionalized Daughter Gels Made Possible by Visible Light Photoredox Catalysis Our ability to control polymer network topology has been further enhanced by developing living additive manufacturing as an effective strategy to expand the original topology of parent networks in a photo-growth fashion. This approach enables us to transform the mechanical/physical properties of parent networks post-synthetically. Chapter 6: polyMOF Nanoparticles: Dual Roles of a Multivalent polyMOF Ligand in Size Control and Surface Functionalization Here we present a novel approach to synthesizing well defined metal-organic framework nanoparticles (MOF NPs), where the size control and surface functionalization of MOF-5 NPs were simultaneously achieved using multivalent polyMOF ligands.
Book Synopsis Advancing Reversible Shape Memory by Tuning the Polymer Network Architecture by :
Download or read book Advancing Reversible Shape Memory by Tuning the Polymer Network Architecture written by and published by . This book was released on 2016 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because of counteraction of a chemical network and a crystalline scaffold, semicrystalline polymer networks exhibit a peculiar behavior--reversible shape memory (RSM), which occurs naturally without applying any external force and particular structural design. There are three RSM properties: (i) range of reversible strain, (ii) rate of strain recovery, and (iii) decay of reversibility with time, which can be improved by tuning the architecture of the polymer network. Different types of poly(octylene adipate) networks were synthesized, allowing for control of cross-link density and network topology, including randomly cross-linked network by free-radical polymerization, thiol-ene clicked network with enhanced mesh uniformity, and loose network with deliberately incorporated dangling chains. It is shown that the RSM properties are controlled by average cross-link density and crystal size, whereas topology of a network greatly affects its extensibility. In conclusion, we have achieved 80% maximum reversible range, 15% minimal decrease in reversibility, and fast strain recovery rate up to 0.05 K-1, i.e., ca. 5% per 10 s at a cooling rate of 5 K/min.
Book Synopsis Control of Network Topology in Photopolymer Networks for Additive Manufacturing by : Ke Qin (Scientist in chemistry)
Download or read book Control of Network Topology in Photopolymer Networks for Additive Manufacturing written by Ke Qin (Scientist in chemistry) and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 1. The introduction provides an overview of additive manufacturing as well as the material systems and photochemical processes that enable additive manufacturing. An emphasis is placed on work done to regulate free radical polymerization via addition-fragmentation chain transfer (AFCT) and reversible addition-fragmentation chain transfer (RAFT), and their applications in photopolymer networks to improve material properties and introduce novel functional materials to additive manufacturing.
Book Synopsis Topological Polymer Chemistry by : Yasuyuki Tezuka
Download or read book Topological Polymer Chemistry written by Yasuyuki Tezuka and published by Springer Nature. This book was released on 2022-02-25 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive description of topological polymers, an emerging research area in polymer science and polymer materials engineering. The precision polymer topology designing is critical to realizing the unique polymer properties and functions leading to their eventual applications. The prominent contributors are led by Principal Editor Yasuyuki Tezuka and Co-Editor Tetsuo Deguchi. Important ongoing achievements and anticipated breakthroughs in topological polymers are presented with an emphasis on the spectacular diversification of polymer constructions. The book serves readers collectively to acquire comprehensive insights over exciting innovations ongoing in topological polymer chemistry, encompassing topological geometry analysis, classification, physical characterization by simulation and the eventual chemical syntheses, with the supplementary focus on the polymer folding, invoked with the ongoing breakthrough of the precision AI prediction of protein folding. The current revolutionary developments in synthetic approaches specifically for single cyclic (ring) polymers and the topology-directed properties/functions uncovered thereby are outlined as a showcase example. This book is especially beneficial to academic personnel in universities and to researchers working in relevant institutions and companies. Although the level of the book is advanced, it can serve as a good reference book for graduate students and postdocs as a source of valuable knowledge of cutting-edge topics and progress in polymer chemistry.
Book Synopsis Controlled and Living Polymerizations by : Krzysztof Matyjaszewski
Download or read book Controlled and Living Polymerizations written by Krzysztof Matyjaszewski and published by John Wiley & Sons. This book was released on 2009-09-28 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by a highly prestigious and knowledgeable team of top scientists in the field, this book provides an overview of the current status of controlled/living polymerization, combining the synthetic, mechanistic and application-oriented aspects. From the contents: * Anionic Vinyl Polymerization * Carbocationic Polymerization * Radical Polymerization * Coordinative Polymerization of Olefins * Ring-Opening Polymerization of Heterocycles * Ring-Opening Metathesis Polymerization * Macromolecular Architectures * Complex Functional Macromolecules * Synthesis of Block and Graft Copolymers * Bulk and Solution Structures of Block Copolymers * Industrial Applications While some of the material is based on chapters taken from the four-volume work "Macromolecular Engineering", it is completely updated and rewritten to reflect the focus of this monograph. Must-have knowledge for polymer and organic chemists, plastics technologists, materials scientists and chemical engineers.
Book Synopsis Physics of Polymer Gels by : Takamasa Sakai
Download or read book Physics of Polymer Gels written by Takamasa Sakai and published by John Wiley & Sons. This book was released on 2020-04-20 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explains the correlation between the physical properties and structure of polymer gels This book elucidates in detail the physics of polymer gels and reviews their unique properties that make them attractive for innumerable applications. Geared towards experienced researchers and entrants to the field, it covers rubber elasticity, swelling and shrinking, deformation and fracture of as well as mass transport in polymer gels, enabling the readers to purposefully design polymer gels fit for specific purposes. Divided into two parts, Physics of Polymer Gels starts by explaining the statistical mechanics and scaling of a polymer chains, and that of polymer solutions. It then introduces the structure of polymer gels and explains the rubber elasticity, which predicts the solid-like nature of polymer gels. Next, it describes swelling/deswelling, which can be understood by combining the rubber elasticity and the osmotic pressure of a polymer solution. Large deformation and fracture, and the diffusion of substances in polymer gels, which are essential for practical applications, are also introduced. The last half of the book contains the authors' experimental results using Tetra-PEG gels and provides readers with the opportunity to examine and compare it with the first half in order to understand how to utilize the models to experiments. This title: * Is the first book dedicated to the physics of polymer gels * Describes in detail the properties of polymer gels and their underlying physics, facilitating the development of novel, polymer gel-based applications * Serves as a reference for all relevant polymer gel properties and their underlying physics * Provides a unified treatment of the subject, explaining the physical properties of polymer gels within a common nomenclature framework Physics of Polymer Gels is a must-have book for experienced researchers, such as polymer chemists, materials scientists, organic chemists, physical chemists, and solid-state physicists, as well as for newcomers to the field.
Book Synopsis Structural Modeling of Dynamic Polymer Networks by : Eric Allen Alt
Download or read book Structural Modeling of Dynamic Polymer Networks written by Eric Allen Alt and published by . This book was released on 2019 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer network based gels are an important class of materials with a wide range of applications. Dynamic polymer networks, which crosslink via the formation of reversible bonds, in particular have great potential as stimuli responsive, mechanically tunable, and self-healing materials. Many important emergent properties of these materials, such as mechanical strength, are mediated by their underlying network structure, which can be characterized by the network topology and spatial distribution of nodes. Therefore, unlocking the full potential of these materials through rational design requires an understanding of how network structure arises as a function of network-forming precursor design. Because the bonds that crosslink dynamic polymer networks are reversible, stresses initially present or otherwise induced in these systems can be relieved through network rearrangement. As such, given sufficient time to relax, the network structure is determined by equilibrium thermodynamics. This work presents a thermodynamic formalism which characterizes the free energy of a network in terms of node positional, network topological, and polymer conformational entropies. Through this lens, and aided by numerical calculations and simulations of model networks, we show how the free energy landscape with respect to density relates to factors which can be readily controlled through precursor design, such as polymer length and node size. Additionally, Monte Carlo simulations of explicit networks reveal that thermodynamic relaxation can give rise to spatial heterogeneity in the arrangement of network nodes. In the last chapter we use the tools developed in the earlier chapters to explore how these same design parameters influence the topological statistics of equilibrium networks. In addition to showing how internode connectivity increases with polymer length and system density, we find that inhomogeneity due to spatial relaxation can also lead to greater network connectivity. Finally, we explore the weakening of network topologies due to substitution of polymer-linked node forming components with topologically non-functional counterparts, finding that larger nodes fare better than their smaller counterparts in maintaining network connectivity when these substitutions are made.
Book Synopsis Hypercrosslinked Polymeric Networks and Adsorbing Materials by : Vadim Davankov
Download or read book Hypercrosslinked Polymeric Networks and Adsorbing Materials written by Vadim Davankov and published by Elsevier. This book was released on 2010-10-06 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hypercrosslinked network polymers present a new class of polymeric materials with very wide application possibilities, including adsorption technology, ion exchange, HPLC, analytical chemistry, nanotechnology (nanocomposites), medical polymers - First book describing the theory, practice of preparation and use of polymeric adsorbing materials with the emphasis on new hypercrosslinked polystyrene-type polymers - Written by the originators of the concept of hypercrosslinked polymers - Complex phenomena are explained by appealing to common sense, analogies and well-known effects, rather than complex mathematical treatment and computer modelling - Reviews many Russian, German and even Czech language publications - Contains numerous experimental data in the form of Figures and Tables
Download or read book Polymer Networks written by R.F. Stepto and published by Springer. This book was released on 1997-12-31 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by an international team of authors with a strong emphasis on the underlying chemistry, this book forms a timely, concise, and accessible evaluation of the fundamentals of polymer network formation, structure, and properties, and how these three aspects are interrelated.
Book Synopsis Controlled Release of Bioactive Materials by : Richard Baker
Download or read book Controlled Release of Bioactive Materials written by Richard Baker and published by Elsevier. This book was released on 2012-12-02 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Controlled Release of Bioactive Materials is a collection papers that deal with the study of controlled release applications in drugs and other pharmacological products and processes. The text covers topics such as the theory and practice of controlled drug delivery from bioerodible polymers, biodegradable drug delivery systems from aliphatic polyesters, and the applications of osmotic drug delivery. Also covered are topics such as the application of polymers for the sustained release of macromolecules, controlled transdermal delivery, and the use of hydrogel devices for the controlled release of steroid hormones. The book is recommended for pharmacologists and doctors who would like to know more about advancements in the field of controlled release applications and its uses in healthcare, especially in pharmacology.
Book Synopsis Effect of Network Structure/Topology on Mechanical Properties of Crosslinked Polymers by : Majid Sharifi
Download or read book Effect of Network Structure/Topology on Mechanical Properties of Crosslinked Polymers written by Majid Sharifi and published by . This book was released on 2015 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interest in epoxy thermosetting polymers is widespread (e.g. Boeing 787 Dreamliner, windmill blades, automobiles, coatings, adhesives, etc.), and a demand still exists for improving toughness of these materials without degrading advantageous properties such as strength, modulus, and Tg. This study introduces novel approaches for improving the intrinsic mechanical characteristics of these polymers. The designed synthetic techniques focus on developing polymer materials with the same overall compositions but varying in network topologies, with distinct topological features in the size range of 5-50 nm, measured by SAXS and SEM. It was found that without altering chemical structure, the network topology of a dense thermoset can be engineered such that, under mechanical deformation, nano-cavities open and dissipate energy before rupturing covalent bonds, producing a tougher material without sacrificing strength, modulus, and even glass transition temperature. Modified structures also revealed higher resistance to fracture than the corresponding control structures. The major fracture mechanism responsible for the increased energy dissipation was found to be nano-cavitation. SEM images from the fracture surfaces showed clear cavities on the modified samples whereas none were seen on the fracture surface of the control samples. Overall, it was demonstrated that network topology can be used to tailor thermal and mechanical properties of thermosetting polymers. The experimental methodologies in this dissertation can directly and economically be applied to design polymeric materials with improved properties for desired applications. Although topology-based toughening was investigated on epoxy-amine polymers, the concept can be extended to most thermoset chemistries and perhaps to other brittle network forming materials.
Book Synopsis Handbook of Polymer Synthesis by : Hans R. Kricheldorf
Download or read book Handbook of Polymer Synthesis written by Hans R. Kricheldorf and published by CRC Press. This book was released on 2004-11-27 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt: An in-depth review of important preparative methods for the synthesis and chemical modification of polymers, this authoritative second edition examines the advantages and limitations of various polymerization applications and procedures. It features new approaches and innovative strategies from the most prominent industry and academic laboratories,
Book Synopsis Advanced Control of Chemical Processes 1994 by : D. Bonvin
Download or read book Advanced Control of Chemical Processes 1994 written by D. Bonvin and published by Elsevier. This book was released on 2014-05-23 with total page 561 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication brings together the latest research findings in the key area of chemical process control; including dynamic modelling and simulation - modelling and model validation for application in linear and nonlinear model-based control: nonlinear model-based predictive control and optimization - to facilitate constrained real-time optimization of chemical processes; statistical control techniques - major developments in the statistical interpretation of measured data to guide future research; knowledge-based v model-based control - the integration of theoretical aspects of control and optimization theory with more recent developments in artificial intelligence and computer science.
Book Synopsis Synthesis Parameters of Chemically and Structurally Tailorable Macromolecular Grafted-Through Polymer Networks by : Jessica Ann Weaver
Download or read book Synthesis Parameters of Chemically and Structurally Tailorable Macromolecular Grafted-Through Polymer Networks written by Jessica Ann Weaver and published by . This book was released on 2021 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer networks have enormous potential for solving many materials engineering challenges in fields such as biomedicine, soft electronics, actuation, and additive-manufacturing. Application-relevant networks, however, are still hindered by poor performance, requiring strength enhancing modifications, or by a limited set of molecular-level dials to control network microstructure for tailored properties and function. For these key reasons, new synthetic approaches are an ongoing need in polymer network engineering, especially those which can impart multi-scale control of structure and architecture, along with, additional parameters for enhancing and controlling physiochemical properties. Macromolecular polymer networks (MPNs), or polymer networks derived themselves from macroscale polymeric building blocks, are a relatively new class of material desired for their high degree of chemical and structural tailorability. In this dissertation, three completely new macromolecular polymer networks possessing enhanced structural tailorability were synthesized and systematically studied to determine the effects of these structures on morphology, viscoelasticity, and thermal behavior. Overall, this knowledge was used to assess the effectiveness of newly applied grafting-through approaches in macroscale polymer network design.
Book Synopsis The Polysiloxanes by : James E. Mark
Download or read book The Polysiloxanes written by James E. Mark and published by Oxford University Press. This book was released on 2015-03-11 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polysiloxanes are the most studied inorganic and semi-inorganic polymers because of their many medical and commercial uses. The Si-O backbone endows polysiloxanes with intriguing properties: the strength of the Si-O bond imparts considerable thermal stability, and the nature of the bonding imparts low surface free energy. Prostheses, artificial organs, objects for facial reconstruction, vitreous substitutes in the eyes, and tubing take advantage of the stability and pliability of polysiloxanes. Artificial skin, contact lenses, and drug delivery systems utilize their high permeability. Such biomedical applications have led to biocompatibility studies on the interactions of polysiloxanes with proteins, and there has been interest in modifying these materials to improve their suitability for general biomedical application. Polysiloxanes examines novel aspects of polysiloxane science and engineering, including properties, work in progress, and important unsolved problems. The volume, with ten comprehensive chapters, examines the history, preparation and analysis, synthesis, characterization, and applications of these polymeric materials.
Book Synopsis Biopolymer Electrolytes by : Sudhakar Y N
Download or read book Biopolymer Electrolytes written by Sudhakar Y N and published by Elsevier. This book was released on 2018-06-09 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biopolymer Electrolytes: Fundamentals and Applications in Energy Storage provides the core fundamentals and applications for polyelectrolytes and their properties with a focus on biopolymer electrolytes. Increasing global energy and environmental challenges demand clean and sustainable energy sources to support the modern society. One of the feasible technologies is to use green energy and green materials in devices. Biopolymer electrolytes are one such green material and, hence, have enormous application potential in devices such as electrochemical cells and fuel cells. - Features a stable of case studies throughout the book that underscore key concepts and applications - Provides the core fundamentals and applications for polyelectrolytes and their properties - Weaves the subject of biopolymer electrolytes across a broad range of disciplines, including chemistry, chemical engineering, materials science, environmental science, and pharmaceutical science
Book Synopsis Controlling Topology, Dynamics and Function of Polymer Brushes Via Post-polymerization Modification by : Piotr Mocny
Download or read book Controlling Topology, Dynamics and Function of Polymer Brushes Via Post-polymerization Modification written by Piotr Mocny and published by . This book was released on 2019 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mots-clés de l'auteur: surface-initiated controlled radical polymerization (SI-CRP) ; surface-initiated atom transfer radical polymerization (SI-ATRP) ; polymer brushes ; post-polymerization modification ; loop polymer brushes ; reversible crosslinks ; nanoparticles ; hybrids ; nanocomposites ; hydrogen evolution reaction (HER).
