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The Effects Of Intermolecular Forces On Polymer Rheology Ii Hydrogen Bonding Above Tg
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Book Synopsis The Effects of Intermolecular Forces on Polymer Rheology, II. Hydrogen Bonding Above Tg by : Edward P. Otocka
Download or read book The Effects of Intermolecular Forces on Polymer Rheology, II. Hydrogen Bonding Above Tg written by Edward P. Otocka and published by . This book was released on 1966 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of three butadiene/methacrylic acid copolymers and three butadiene/2-methyl-5-vinyl pyridine copolymers were evaluated for Young's modulus and stress relaxation modulus between -75C and +75C. Corresponding members of the acidic and basic copolymer series were stoichiometrically combined to provide an intermolecularly hydrogen bonded material which was tested in the same manner. Comparison between the observed modulustemperature curves for the mixed material and the average of the parent materials' modulus-temperature curve reveals a regular, temperature dependent increase in Young's modulus above Tg. Below Tg the rate of increase decreases. The stress relaxation curves of the acidic, basic and mixed copolymers were normalized with respect to Tg. The curves were then differentiated to provide relaxation spectrum curves. The comparison of the average relaxation spectrum curves for the parent materials with that obtained for the mixed material shows depression of short time relaxation mechanisms. Infrared investigations of the hydrogen bond absorptions in stretched films are also discussed. (Author).
Book Synopsis The Effects of Intermolecular Forces on Polymer Rheology, III. Ionic Forces Above Tg by : Edward P. Otacka
Download or read book The Effects of Intermolecular Forces on Polymer Rheology, III. Ionic Forces Above Tg written by Edward P. Otacka and published by . This book was released on 1966 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: In an effort to determine the effects of ionic interactions on the physical properties of polymers, two series of butadiene copolymers were tested for stress strain and stress relaxation behavior. The first group of copolymers were those of butadiene and methacrylic acid which were converted to their anionic form by titration with LiOCH3. The second series were copolymers with 2-methyl, 5-vinyl pyridine which were reacted with CH3I to form the polycations. Finally stoichiometric mixed polysalts were prepared by mixing solutions of the oppositely charged polyions. The modulus-temperature currves of the various materials showed relatively stable plateau values over moderate temperature spans. Both the pyridinium copolymers and the mixed polysalts showed sharp decreases in modulus over a narrow temperature range. This unusual behavior was confirmed in the stress relaxation tests, being manifested as a rapid increase in the shift factors and E(visc), the activation energy for viscous flow. The patterns indicate a transition of one form or another but whether it is indicative of the onset of ionic interchange is not clear. (Author).
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1966 with total page 1506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government-wide Index to Federal Research & Development Reports by :
Download or read book Government-wide Index to Federal Research & Development Reports written by and published by . This book was released on 1966-06 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rheology of Miscible Polymer Blends with Hydrogen Bonding by : Zhiyi Yang
Download or read book Rheology of Miscible Polymer Blends with Hydrogen Bonding written by Zhiyi Yang and published by . This book was released on 2007 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Poly(4-vinylphenol) (PVPh) was blended with four different polymers: poly(vinyl methyl ether) (PVME), poly(vinyl acetate) (PVAc), poly(2-vinylpyridine) (P2VP), and poly(4-vinylpyridine) (P4VP) by solvent casting. The miscibility of these four PVPh-based blend systems was investigated using differential scanning calorimetry (DSC) and the composition-dependent glass transition temperature (Tg) was predicted by a thermodynamic theory. The hydrogen bonds between phenolic group in PVPh and either group, carbonyl group or pyridine group was confirmed by Fourier transform infrared (FTIR) spectroscopy. The fraction of hydrogen bonds was calculated by the Coleman-Graf-Painter association model. Linear dynamic viscoelasticity of four PVPh-based miscible polymer blends with hydrogen bonding was investigated. Emphasis was placed on investigating how the linear dynamic viscoelasticity of miscible polymer blends with specific interactive might be different from that of miscible polymer blends without specific interaction. We have found that an application of time-temperature superposition (TTS) to the PVPh-based miscible blends with intermolecular hydrogen bonding is warranted even when the difference in the component glass transition temperatures is as large as about 200°C, with TTS fails for miscible polymer blends without specific interactions. On the basis of such an observation, we have concluded that hydrogen bonding suppressed concentration fluctuations in PVPh-based miscible blends. It has been found that both the intra-association (self-association) of the phyenoxy hydroxyl groups in PVPh and inter-association (intermolecular interactions) between the constituent components have a profound influence on the frequency dependence of dynamic moduli in the terminal region of the PVPh-based miscible blend systems investigated. Hydrogenated functional polynorbornenes (HFPNBs) were synthesized and they were used to investigate the miscibility and rheology of HFPNB-based miscible blends with hydrogen bonding. Specifically, functional norborneses with carboxylic ( -COOH) group of hydroxyl ( -OH) group were first synthesized and then they were polymerized, via ring-opening metathesis polymerization followed by hydrogenation, to obtain HFPNBs, HPNBCOOH and HPNBOH. Subsequently, the miscibility of binary blends consisting of (1) HPBNCOOH and polycarbonate (PC), (2) HPBNCOOH and poly(2-vinylpyridine) (P2VP), and (3) HPBNOH and PC was investigated using DSC and FTIR spectroscopy. It has been found that both PC/HPBNCOOH and P2VP/HPBNCOOH blend systems exhibit a broad, single glass transition over the entire blend compositions as determined by DSC, indicating that the respective blend systems are miscible, and they form hydrogen bonds as determined by FTIR spectroscopy. On the other hand, PC/HPBNOH blends were found to exhibit two glass transition temperatures, indicating that the blends are not miscible. The dynamic oscillatory shear rheometry has shown than reduced log G' versus log a(T) plots, and also log G' versus log G" plots of PC/HPBNCOOH and P2VP/HPBNCOOH blend systems are independent of temperature. We have concluded that an application of TTS to the miscible polymer blends with hydrogen bonding is warranted although the difference in component glass transition temperatures is as large as 91 °C for the PC/HPNBCOOH blend system."--Abstract.
Book Synopsis Chemorheology of Polymers by : Peter J. Halley
Download or read book Chemorheology of Polymers written by Peter J. Halley and published by Cambridge University Press. This book was released on 2009-05-28 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the dynamics of reactive polymer processes allows scientists to create new, high-value, high-performance polymers. This book is an indispensable resource for researchers and practitioners working in this area. It includes coverage of thermoplastics, thermoset and reactive polymers, together with practical industrial processes and modern chemorheological models and tools.
Book Synopsis Engineering with Rigid PVC by : I. Luis Gomez
Download or read book Engineering with Rigid PVC written by I. Luis Gomez and published by Routledge. This book was released on 2017-11-22 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive, long-needed reference provides the thorough understanding required tomodify and manipulate rigid PVC's thermal/shear sensitivity and rheological properties, helpingyou utilize rigid PVC most effectively in manufacturing applications as diverse as pipes,house siding, bottles , window frames, and packaging films.With complete, up-to-the-minute coverage in one convenient source, Engineering with RigidPVC encompasses rheological principles, resin properties, and additive modification, as wellas polymer preparation, melt processing, and forming techniques ... major conversion operationsand their manufacturing applications-including actual commercial formulations andprocesses .. . quality control procedures necessary to monitor compounding processes ...aspects of processability critical for product development and improvement .. . and muchmore.International in scope, this time- and money-saver is an eseential daily resource for all professionalsinvolved in Engineering with Rigid PVC, including plastics engineers, polymer chemists,process engineers, and plastics processors and technicians. Furthermore, the volume isideal for training programs and professional seminars, and is an outstanding supplement forstudents in polymer chemistry , materials science , and plastics engineering.
Book Synopsis U.S. Government Research & Development Reports by :
Download or read book U.S. Government Research & Development Reports written by and published by . This book was released on 1966-05-10 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Intermolecular Forces on the Rheology of Polymers I: Effects Below the Glass Temperature by : Edward P. Otocka
Download or read book The Effects of Intermolecular Forces on the Rheology of Polymers I: Effects Below the Glass Temperature written by Edward P. Otocka and published by . This book was released on 1964 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two series of styrene copolymers were prepared, containing, respectively, acidic and basic comonomers. The mechanical properties of these copolymers were determined for several temperatures below T sub g. Stoichiometric mixtures of these acidic and basic copolymers were studied over the same temperature range, and their mechanical properties compared to those of the parent materials. It was found that the stoichiometric mixtures showed increased modulus, tensile strength and relaxation times. The increases can be related to functional group content and temperature through simple equations. (Author).
Book Synopsis Bibliography of Scientific and Industrial Reports by :
Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1966 with total page 1258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1966 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Encyclopedia of Agrophysics by : Jan Gliński
Download or read book Encyclopedia of Agrophysics written by Jan Gliński and published by Springer Science & Business Media. This book was released on 2011-06-07 with total page 1075 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Encyclopedia of Agrophysics will provide up-to-date information on the physical properties and processes affecting the quality of the environment and plant production. It will be a "first-up" volume which will nicely complement the recently published Encyclopedia of Soil Science, (November 2007) which was published in the same series. In a single authoritative volume a collection of about 250 informative articles and ca 400 glossary terms covering all aspects of agrophysics will be presented. The authors will be renowned specialists in various aspects in agrophysics from a wide variety of countries. Agrophysics is important both for research and practical use not only in agriculture, but also in areas like environmental science, land reclamation, food processing etc. Agrophysics is a relatively new interdisciplinary field closely related to Agrochemistry, Agrobiology, Agroclimatology and Agroecology. Nowadays it has been fully accepted as an agricultural and environmental discipline. As such this Encyclopedia volume will be an indispensable working tool for scientists and practitioners from different disciplines, like agriculture, soil science, geosciences, environmental science, geography, and engineering.
Book Synopsis Berichte der Deutschen Rheologischen Gesellschaft e.V. mit Dokumentation Rheologie by : Deutsche Rheologische Gesellschaft
Download or read book Berichte der Deutschen Rheologischen Gesellschaft e.V. mit Dokumentation Rheologie written by Deutsche Rheologische Gesellschaft and published by . This book was released on 1969 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrogen Bonded Polymers by : Wolfgang Binder
Download or read book Hydrogen Bonded Polymers written by Wolfgang Binder and published by Springer Science & Business Media. This book was released on 2007-03-16 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: Control of polymeric structure is among the most important endeavours of modern macromolecular science. In particular, tailoring the positioning and strength of intermolecular forces within macromolecules by synthetic methods and thus gaining structural control over the final polymeric materials has become feasible, resulting in the field of supramolecular polymer science. Besides other intermolecular forces, hydrogen bonds are unique intermolecular forces enabling the tuning of material properties via self-assembly processes over a wide range of interactions strength ranging from several kJmol to several tens of kJmol . Central for the formation of these structures are precursor molecules of small molecular weight (usually lower than 10 000), which can assemble in solid or solution to aggregates of defined geometry.
Download or read book Engineered Materials Abstracts written by and published by . This book was released on 1991-03 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unconventional Nanopatterning Techniques and Applications by : John A. Rogers
Download or read book Unconventional Nanopatterning Techniques and Applications written by John A. Rogers and published by John Wiley & Sons. This book was released on 2008-11-13 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: Patterning or lithography is at the core of modern science and technology and cuts across all disciplines. With the emergence of nanotechnology, conventional methods based on electron beam lithography and extreme ultraviolet photolithography have become prohibitively expensive. As a result, a number of simple and unconventional methods have been introduced, beginning first with research demonstrations in the mid 1990s. This book focuses on these unconventional patterning techniques and their applications to optics, organic devices, electronic devices, biological devices, and fluidics.
