Titanium Complexes Based on Aminodiol Ligand for Ring Opening Polymerization of Cyclic Esters

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (781 download)

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Book Synopsis Titanium Complexes Based on Aminodiol Ligand for Ring Opening Polymerization of Cyclic Esters by : Dakshinamoorthy Deivasagayam

Download or read book Titanium Complexes Based on Aminodiol Ligand for Ring Opening Polymerization of Cyclic Esters written by Dakshinamoorthy Deivasagayam and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of titanium isopropoxides complexes coordinated by enantiopure, racemic, meso and diastereomeric aminodiol ligands have been prepared and characterized by spectroscopic techniques. The complexes were tested as initiators for the ring opening polymerization (ROP) of cyclic esters such as L/rac-lactide, caprolactone, butyrolactone and trimethylene carbonate via coordination-insertion mechanism. In lactide polymerizations, all complexes showed significant activity both in solution at 70°C and in bulk at 130°C with a good control. The complex derived from rac-aminodiol ligand gave partially heterotactic polylactide in ROP of rac-lactide, whereas all other complexes yielded atactic polylactides. For caprolactone polymerizations, all complexes were found to be effective initiators under both solution and bulk conditions (up to 60% monomer conversion was reached within 10 min in bulk condition at 70°C), again with good control. Kinetic studies of ROP of lactides and caprolactone in solution conditions have been investigated and showed a first kinetic order in monomer. Significant activities were also observed for (ROP) of butyrolactone and trimethylene carbonate. Block copolymers of caprolactone and lactides were successfully synthesized with these catalytic systems by sequential polymerization techniques. The complexes were also tested as initiators for the production of random copolymers containing caprolactone and lactides and a reverse order of reactivity was observed between lactide and caprolactone compared to homopolymerization.

Mono(cyclopentadienyl)titanium Complexes as Initiators for Living Ring-opening Polymerization of Lactones

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ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.:/5 (8 download)

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Book Synopsis Mono(cyclopentadienyl)titanium Complexes as Initiators for Living Ring-opening Polymerization of Lactones by : Il'ya L. Rushkin

Download or read book Mono(cyclopentadienyl)titanium Complexes as Initiators for Living Ring-opening Polymerization of Lactones written by Il'ya L. Rushkin and published by . This book was released on 1993 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Improvement in Titanium Complexes Supported by Schiff Bases in Ring-opening Polymerization of Cyclic Esters: ONO-tridentate Schiff Bases

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (15 download)

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Book Synopsis Improvement in Titanium Complexes Supported by Schiff Bases in Ring-opening Polymerization of Cyclic Esters: ONO-tridentate Schiff Bases by :

Download or read book Improvement in Titanium Complexes Supported by Schiff Bases in Ring-opening Polymerization of Cyclic Esters: ONO-tridentate Schiff Bases written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Science and Principles of Biodegradable and Bioresorbable Medical Polymers

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Publisher : Woodhead Publishing
ISBN 13 : 0081003935
Total Pages : 478 pages
Book Rating : 4.0/5 (81 download)

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Book Synopsis Science and Principles of Biodegradable and Bioresorbable Medical Polymers by : Xiang Cheng Zhang

Download or read book Science and Principles of Biodegradable and Bioresorbable Medical Polymers written by Xiang Cheng Zhang and published by Woodhead Publishing. This book was released on 2016-09-22 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Science and Principles of Biodegradable and Bioresorbable Medical Polymers: Materials and Properties provides a practical guide to the use of biodegradable and bioresorbable polymers for study, research, and applications within medicine. Fundamentals of the basic principles and science behind the use of biodegradable polymers in advanced research and in medical and pharmaceutical applications are presented, as are important new concepts and principles covering materials, properties, and computer modeling, providing the reader with useful tools that will aid their own research, product design, and development. Supported by practical application examples, the scope and contents of the book provide researchers with an important reference and knowledge-based educational and training aid on the basics and fundamentals of these important medical polymers. Provides a practical guide to the fundamentals, synthesis, and processing of bioresorbable polymers in medicine Contains comprehensive coverage of material properties, including unique insights into modeling degradation Written by an eclectic mix of international authors with experience in academia and industry

Biometal Catalyzed Ring-opening Polymerization of Cyclic Esters

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (85 download)

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Book Synopsis Biometal Catalyzed Ring-opening Polymerization of Cyclic Esters by : Osit Karroonnirun

Download or read book Biometal Catalyzed Ring-opening Polymerization of Cyclic Esters written by Osit Karroonnirun and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Biodegradable polyesters represent a class of extremely useful polymeric materials for many applications. Among these polyesters, the biodegradable and biocompatible, polylactide is very promising for many applications in both medical and industrial areas. Other biodegradable polymers such as polytrimethylene carbonate, polybutyrolactone, polyvalerolactone, and polycaprolactone can be blended or copolymerized with polylactide to fine tune the properties to fit the needs for their applications. The properties of these polymers and copolymers depend upon the tacticity of the polymers which can be directly controlled by the catalysts used for polymer production. Therefore, it has been of great interest to develop new selective catalytic systems for the ring-opening polymerization of lactide and other cyclic monomers. This dissertation focuses on developing new zinc and aluminum complexes and studying their selectivity and reactivity of these complexes for the ring-opening polymerization of lactide and other cyclic monomers, i.e. trimethylene carbonate, beta-butyrolactone, delta-valerolactone, and epsilon-caprolactone. Herein, aspects of the ring-opening polymerization of lactide and other cyclic monomers utilizing novel zinc and aluminum complexes will be discussed in detail. In the process for the ring-opening polymerization of lactide, chiral zinc half-salen complexes derived from natural amino acids have shown to be very active catalysts for producing polymers with high molecular weight and narrow polydispersities at ambient temperature. The chiral zinc complexes were found to catalyze rac-lactide to heterotactic polylactides with Pr values ranging from 0.68-0.89, depending on the catalyst and reaction temperature employed during the polymerization process. The reactivities of the various catalysts were greatly affected by substituents on the Schiff base ligands, with sterically bulky substituents being rate-enhancing. Furthermore, a series of both chiral and achiral aluminium half-salen complexes have been synthesized and characterized. These aluminum complexes all showed moderate selectivity to the ring-opening polymerization of rac-lactide to produce isotactic polylactide with Pm value up to 0.82 in toluene at 70 degrees C. Moreover, some of the studied aluminum complexes displayed epimerization of rac-lactide to meso-lactide during the polymerization process. Kinetic studies for the ring-opening polymerization of lactide utilizing these zinc and aluminum complexes are included in this dissertation. Along with these studies, the copolymerization of lactide with epsilon-caprolactone and delta-valerolactone will also be presented.

Ti(IV) and Zr(IV) Schiff Base 1,2-diolate Complexes for Ring-opening Polymerization of Cyclic Esters

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ISBN 13 :
Total Pages : 46 pages
Book Rating : 4.:/5 (131 download)

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Book Synopsis Ti(IV) and Zr(IV) Schiff Base 1,2-diolate Complexes for Ring-opening Polymerization of Cyclic Esters by : Anna Makar-Limanov

Download or read book Ti(IV) and Zr(IV) Schiff Base 1,2-diolate Complexes for Ring-opening Polymerization of Cyclic Esters written by Anna Makar-Limanov and published by . This book was released on 2020 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Studies of the Ring-opening Polymerization of Cyclic Ethers and Esters by Coordinate Catalysis

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ISBN 13 :
Total Pages : 376 pages
Book Rating : 4.3/5 ( download)

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Book Synopsis Studies of the Ring-opening Polymerization of Cyclic Ethers and Esters by Coordinate Catalysis by : Diana Navarro-Llobet

Download or read book Studies of the Ring-opening Polymerization of Cyclic Ethers and Esters by Coordinate Catalysis written by Diana Navarro-Llobet and published by . This book was released on 2002 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Macromolecular Engineering

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Publisher : Elsevier
ISBN 13 : 0128232579
Total Pages : 310 pages
Book Rating : 4.1/5 (282 download)

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Book Synopsis Macromolecular Engineering by : Alex Lubnin

Download or read book Macromolecular Engineering written by Alex Lubnin and published by Elsevier. This book was released on 2021-02-09 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Macromolecular Engineering: Design, Synthesis and Application of Polymers explores the role of macromolecular engineering in the development of polymer systems with engineered structures that offer the desired combination of properties for advanced applications. This book is organized into sections covering theory and principles, science and technology, architectures and technologies, and applications, with an emphasis on the latest advances in techniques, materials, properties, and end uses – and including recently commercialized, or soon to be commercialized, designed polymer systems. The chapters are contributed by a group of leading figures who are actively researching in the field. This is an invaluable resource for researchers and scientists interested in polymer synthesis and design, across the fields of polymer chemistry, polymer science, plastics engineering, and materials science and engineering. In industry, this book supports engineers, R&D, and scientists working on polymer design for application areas such as biomedical and healthcare, automotive and aerospace, construction and consumer goods. Presents the theory, principles, architectures, technologies, and latest advances in macromolecular engineering for polymer design and synthesis Explains polymer design for cutting-edge applications areas, including coatings, automotive, industrial, household and medical uses Approaches several novel materials, such as polyisobutylene (PIB), polyamide-based polyurethanes, and aliphatic polyesters

Polynuclear Titanium Complexes for the Ring-opening Polymerisation of Lactide

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis Polynuclear Titanium Complexes for the Ring-opening Polymerisation of Lactide by : Jean-Marie Eugène Pascal Cols

Download or read book Polynuclear Titanium Complexes for the Ring-opening Polymerisation of Lactide written by Jean-Marie Eugène Pascal Cols and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Syntheses and Characterizations of Monomeric Amidinate Tin(II) Complexes for Ring-opening Polymerization of Cyclic Esters

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ISBN 13 :
Total Pages : 166 pages
Book Rating : 4.:/5 (816 download)

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Book Synopsis Syntheses and Characterizations of Monomeric Amidinate Tin(II) Complexes for Ring-opening Polymerization of Cyclic Esters by : Chatyapha Pongchan-o

Download or read book Syntheses and Characterizations of Monomeric Amidinate Tin(II) Complexes for Ring-opening Polymerization of Cyclic Esters written by Chatyapha Pongchan-o and published by . This book was released on 2009 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Synthesis of Al and Zn Complexes, and Their Catalytic Activity Toward the Ring-opening Polymerization of Cyclic Esters

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ISBN 13 :
Total Pages : 338 pages
Book Rating : 4.:/5 (995 download)

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Book Synopsis Synthesis of Al and Zn Complexes, and Their Catalytic Activity Toward the Ring-opening Polymerization of Cyclic Esters by : K. Bakthavachalam

Download or read book Synthesis of Al and Zn Complexes, and Their Catalytic Activity Toward the Ring-opening Polymerization of Cyclic Esters written by K. Bakthavachalam and published by . This book was released on 2014 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Synthesis and Characterization of Dimethylbismuth and -indium Phenoxy-imine Complexes as Potential Catalysts for the Ring Opening Polymerization of Cyclic Esters

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ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (128 download)

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Book Synopsis Synthesis and Characterization of Dimethylbismuth and -indium Phenoxy-imine Complexes as Potential Catalysts for the Ring Opening Polymerization of Cyclic Esters by : Kathleen Morrison

Download or read book Synthesis and Characterization of Dimethylbismuth and -indium Phenoxy-imine Complexes as Potential Catalysts for the Ring Opening Polymerization of Cyclic Esters written by Kathleen Morrison and published by . This book was released on 2019 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Ring-opening Polymerization

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ISBN 13 :
Total Pages : 632 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Ring-opening Polymerization by : Kenneth John Ivin

Download or read book Ring-opening Polymerization written by Kenneth John Ivin and published by . This book was released on 1984 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Metallic Catalysts for Ring Opening Polymerization of Cyclic Esters and Related Compounds

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Publisher : Mohammed Abdul Sattar
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.2/5 (243 download)

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Book Synopsis Metallic Catalysts for Ring Opening Polymerization of Cyclic Esters and Related Compounds by : Isha Jain

Download or read book Metallic Catalysts for Ring Opening Polymerization of Cyclic Esters and Related Compounds written by Isha Jain and published by Mohammed Abdul Sattar. This book was released on 2024-03-24 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers are extremely useful materials that have become an irreplaceable component of modern life. Synthetic polymers exhibit a multitude of applications in medicine, agriculture, packaging, and textile industries. Synthetic polymers like poly(ethylene) (PE), poly(propylene) (PP) and poly(styrene) (PS), poly (vinyl chloride) (PVC), poly (ethylene terephthalate) (PET), poly (urethane) (PU), etc. are obtained from petroleum-based sources and cover 90% of total synthesized plastics. A recent report revealed that global plastic production has increased from 270 million metric tons in the year 2010 to 370 million metric tons in 2020. The annual production volumes are expected to increase further in the coming years, approximately 590 million metric tons by the year 2050. Due to the non-biodegradability of synthetic polymers, each year post-consumer plastics generate huge waste which is diverted to landfills or the natural environment. These are pervasive and persistent in the environment and cause ecological and health risks at a global scale. In the recent past, a lot of scientific research efforts are devoted to replace non- biodegradable petroleum-based resources with renewable biodegradable polymers, and the polymer industry has witnessed remarkable progress. The bioplastics are rapidly gaining commercial interest globally, which is indicated by the up-trend in the market size which rose up to USD 13.11 billion in 2022 and expected to hit USD 46.1 billion by 2030. Estimated annual growth rate (CAGR) is expected to retain a value of 17.02% from 2022 to 2030. Among the various classes of biodegradable polymers, aliphatic polyesters are of leading interest since hydrolytic or enzymatic cleavage yields hydroxy carboxylic acids which can be metabolized to produce water and carbon dioxide as degradation products without formation of any toxic side product. For example, PLA (polylactide) is an attractive renewable alternative to the petro-based polymers, it decomposes in biological environments or in the presence of microorganisms to H20, C02 and humus to soil.

Polymer Science: A Comprehensive Reference

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Publisher : Newnes
ISBN 13 : 0080878628
Total Pages : 7752 pages
Book Rating : 4.0/5 (88 download)

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Book Synopsis Polymer Science: A Comprehensive Reference by :

Download or read book Polymer Science: A Comprehensive Reference written by and published by Newnes. This book was released on 2012-12-05 with total page 7752 pages. Available in PDF, EPUB and Kindle. Book excerpt: The progress in polymer science is revealed in the chapters of Polymer Science: A Comprehensive Reference, Ten Volume Set. In Volume 1, this is reflected in the improved understanding of the properties of polymers in solution, in bulk and in confined situations such as in thin films. Volume 2 addresses new characterization techniques, such as high resolution optical microscopy, scanning probe microscopy and other procedures for surface and interface characterization. Volume 3 presents the great progress achieved in precise synthetic polymerization techniques for vinyl monomers to control macromolecular architecture: the development of metallocene and post-metallocene catalysis for olefin polymerization, new ionic polymerization procedures, and atom transfer radical polymerization, nitroxide mediated polymerization, and reversible addition-fragmentation chain transfer systems as the most often used controlled/living radical polymerization methods. Volume 4 is devoted to kinetics, mechanisms and applications of ring opening polymerization of heterocyclic monomers and cycloolefins (ROMP), as well as to various less common polymerization techniques. Polycondensation and non-chain polymerizations, including dendrimer synthesis and various "click" procedures, are covered in Volume 5. Volume 6 focuses on several aspects of controlled macromolecular architectures and soft nano-objects including hybrids and bioconjugates. Many of the achievements would have not been possible without new characterization techniques like AFM that allowed direct imaging of single molecules and nano-objects with a precision available only recently. An entirely new aspect in polymer science is based on the combination of bottom-up methods such as polymer synthesis and molecularly programmed self-assembly with top-down structuring such as lithography and surface templating, as presented in Volume 7. It encompasses polymer and nanoparticle assembly in bulk and under confined conditions or influenced by an external field, including thin films, inorganic-organic hybrids, or nanofibers. Volume 8 expands these concepts focusing on applications in advanced technologies, e.g. in electronic industry and centers on combination with top down approach and functional properties like conductivity. Another type of functionality that is of rapidly increasing importance in polymer science is introduced in volume 9. It deals with various aspects of polymers in biology and medicine, including the response of living cells and tissue to the contact with biofunctional particles and surfaces. The last volume is devoted to the scope and potential provided by environmentally benign and green polymers, as well as energy-related polymers. They discuss new technologies needed for a sustainable economy in our world of limited resources. Provides broad and in-depth coverage of all aspects of polymer science from synthesis/polymerization, properties, and characterization methods and techniques to nanostructures, sustainability and energy, and biomedical uses of polymers Provides a definitive source for those entering or researching in this area by integrating the multidisciplinary aspects of the science into one unique, up-to-date reference work Electronic version has complete cross-referencing and multi-media components Volume editors are world experts in their field (including a Nobel Prize winner)

Synthesis, Characterization and Oxidation of New Divalent Lanthanide Bis(phenolate) Complexes and Their Applications in the Ring Opening Polymerization of Cyclic Esters

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ISBN 13 :
Total Pages : 272 pages
Book Rating : 4.:/5 (694 download)

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Book Synopsis Synthesis, Characterization and Oxidation of New Divalent Lanthanide Bis(phenolate) Complexes and Their Applications in the Ring Opening Polymerization of Cyclic Esters by : Divine Timah Dugah

Download or read book Synthesis, Characterization and Oxidation of New Divalent Lanthanide Bis(phenolate) Complexes and Their Applications in the Ring Opening Polymerization of Cyclic Esters written by Divine Timah Dugah and published by . This book was released on 2009 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Synthesis of New Titanium Complexes Bearing a Bidentate Monoanionic Inversely-Polarized Phosphaalkene-Enolate Ligand and Their Activity in Olefin Polymerization

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (136 download)

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Book Synopsis Synthesis of New Titanium Complexes Bearing a Bidentate Monoanionic Inversely-Polarized Phosphaalkene-Enolate Ligand and Their Activity in Olefin Polymerization by : Matthew Alexander Wiebe

Download or read book Synthesis of New Titanium Complexes Bearing a Bidentate Monoanionic Inversely-Polarized Phosphaalkene-Enolate Ligand and Their Activity in Olefin Polymerization written by Matthew Alexander Wiebe and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis and characterization of several inversely-polarized phosphaalkenes, including the first ring-expanded inversely-polarized hydrido-phosphaalkene and imidazolidine-based inversely-polarized phosphaalkene-enolate ligand precursors, are herein reported. Coordination of the imidazolidine-based ligands to titanium was studied. Minimal decomposition (6%) of the isolated complex occurred over several days at 60 C. The titanium complexes were explored computationally where it was revealed that there is evidence for the phosphorus atom of the bound ligand to donate an additional pair of electrons to Ti, resulting in a large stabilization of 18.2 kcal mol1. Furthermore, the titanium complex has activity up to 5.64 kgPE mol1Ti h1 in the polymerization of ethylene with little decomposition of the active species over several hours. The polymer produced was high-density polyethylene with an average molecular weight of 17.6 kDa and a Tm of 131 C.