Download or read book Strain induced Crystallization of Polyethylene written by Wai-Shing Yung and published by . This book was released on 1987 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strain induced Crystallization of Crosslinked Polyethylene written by Wai-Shing Yung and published by . This book was released on 1991 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The kinetics of strain-induced crystallization of ultra high molecular weight polyethylene (UHMWPE) in both the dry and swollen states have been studied using a digital imaging technique coupled with dynamometry. Polymer fibers obtained by spinning a gel of polyethylene in paraffin oil were lightly crosslinked with dicumyl peroxide to provide samples with different amounts of chemical crosslinks and physical trapped entanglements. For experiments in the dry state, the sample was surrounded by silicon oil while in the swollen state experiments the sample was swollen in xylene. Samples were drawn to different draw ratios (1.2 $leq$ $alpha$ $leq$ 1.7) at elevated temperatures and then quenched to the crystallization temperature. The birefringence and retractive force of the sample during crystallization were measured and converted to volume fraction crystallinity. An Avrami analysis indicated that in both the dry and swollen states the crystallization followed a heterogenous nucleation with one-dimensional linear growth mechanism regardless of draw ratio and degree of undercooling. The crystal growth rate exhibited a normal exponential decay with the degree of undercooling as predicted by theories. The size of the critical growth nucleus is found to increase exponentially with the concentration of chemical crosslinks while the concentration of physical entanglements was held constant. In the limit of zero chemical crosslink concentration, the size of the critical growth nucleus falls between the range of 5 to 8 A for different physical entanglement concentrations. It is concluded that when the concentration of chemical crosslinks is low, their role in aiding the orientation and crystallization is indistinguishable from that of physical entanglements. Furthermore, there may exist a threshold of entanglement concentration which is needed to preserve the structure formed by the orienting force so that crystallization can take place.

Download or read book Structure and Properties of Oriented Polymers written by I. Ward and published by Springer Science & Business Media. This book was released on 2013-12-14 with total page 515 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has become increasingly evident that there is much to begained from a detailed understanding of the structure and properties of polymers in the oriented state. This book reftects the growth of interest in this area of polymer scienceand attempts to give the reader an up to date viewofthe present position. The individual chapters are for the most part self contained, and cover a very wide range of topics. It is intended that each of them should serve the dual purpose of an expository introduction to the subject and a topical review of recent research. It is inevitable that there will be differences of style and approach in the contributions from the different authors. No atternpt has been made to moderate these differences, as they serve to illustrate the diversity of approaches required to give the reader a balanced view of the subject. I should like to thank the contributors for their endeavours, and especially for their patience in accepting modifications and corrections which make for consistency in the book as a whole. 1 am particularly indebted to Professor Leslie Holliday who originally approached me with the proposition that such a book would be a worthwhile venture and to the publishers who have given me every assistance in making its progress as painless as possible.

Download or read book Visualization of the Evolution of a Continuous Crystalline Phase in Uniaxially Drawn Polyethylene written by Jean Marie Brady and published by . This book was released on 1987 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Polymer Structure and Property Studies in Elongational Rheology Spherulite Deformation and Biaxial Strain Induced Crystallization written by Brandt Kennedy Carter and published by . This book was released on 1986 with total page 1372 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stress Induced Crystallization in Cross linked Polyethylene written by Virgil Vester Vickroy and published by . This book was released on 1965 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Kinetics of Straininduced Crystallization of Polymers During Flow written by G. S. Y. Yeh and published by . This book was released on 1982 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results from experimental studies of strain-crystallized polyethylenes, prepared in a simple shear couette rheometer, indicate a substantial increase in nucleation rate, a decrease in long period, as well as an increase in melting temperature with increasing shear. The changes appear to have the same thermodynamic origin in the reduction of the amount of melt entropy, Delta S', just prior to crystallization according to a strain-induced crystallization theory by Yeh and Hong. Consequently from the measured nucleation rate one can predict what the decrease in long period or the increase in melting temperature should be for a given strain-crystallized polyethylene. For example, the measured melting temperatures are indeed shown to be comparable to those predicted from nucleation rate measurements.

Download or read book Pressure Induced Crystallization in Polyethylene written by S. Matsuoka and published by . This book was released on 1959 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Flow Induced Crystallization of Polymers written by Gaetano Guerra and published by Wiley-VCH. This book was released on 2002-12-20 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: In polymer processing, the molecular orientation induced by flow has a significant effect on the crystallization kinetics and final morphology of the polymer produced. The impact on processing operations and object properties is extremely important and recently scientific and technological researchers have begun to quanitify these effects. The international conference 'Flow-Induced Crystallization of Polymers', held in October 2001 in Salerno, Italy, was timely and well attended. An interdisciplinary approach was taken and presentations were made on topics ranging from real-time measurement, through modelling, to final morphology and properties of polymers. Invited and other selected contributions from the conference are collected here, in this volume of Macromolecular Symposia

Download or read book The Physics of Deformation and Fracture of Polymers written by A. S. Argon and published by Cambridge University Press. This book was released on 2013-03-07 with total page 535 pages. Available in PDF, EPUB and Kindle. Book excerpt: A physical, mechanism-based presentation of the plasticity and fracture of polymers, covering industrial scale applications through to nanoscale biofluidic devices.

Download or read book The Stress induced Crystallization of Cross linked Polyethylene written by Timothy Wesley Bornemann and published by . This book was released on 1977 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modern Polyesters written by John Scheirs and published by John Wiley & Sons. This book was released on 2005-09-01 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of the family of polyester polymers which comprise an important group of plastics that span the range of commodity polymers to engineering resins. It describes the preparation, properties and applications of polyesters. Readers will also find details on polyester-based elastomers, biodegradable aliphatic polyester, liquid crystal polyesters and unsaturated polyesters for glass-reinforced composites. Presents an overview of the most recent developments. Explores synthesis, catalysts, processes, properties and applications. Looks at emerging polyester materials as well as existing ones. Written by foremost experts from both academia and industry, ensuring that both fundamentals and practical applications are covered.

Download or read book Handbook of Thermoplastic Polyesters written by Stoyko Fakirov and published by Wiley-VCH Verlag GmbH. This book was released on 2002 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book covers current knowledge on all aspects of polyester synthesis, structure, properties (chemical, physical and application relevant) and recycling. The most important technical polyesters are presented in detailed chapters, homogeneous polymers as well as copolymers, blends and high-performance reinforced polyester materials are discussed. This book is directed to chemists, physicists and engineers working in research, development and application of polymers.

Download or read book Solidification Processes in Polymers written by Jan-Fredrik Jansson and published by Springer. This book was released on 1992 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is devoted to solidification of polymers in general; crystalline, liquid crystalline, and amorphous polymers, including oriented polymers and the effects of pressure and processing are discussed. A distinguished international group of authors has contributed to the volume.

Download or read book Polymer Crystallization II written by Finizia Auriemma and published by Springer. This book was released on 2016-12-21 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series Advances in Polymer Science presents critical reviews of the present and future trends in polymer and biopolymer science. It covers all areas of research in polymer and biopolymer science including chemistry, physical chemistry, physics, material science. The thematic volumes are addressed to scientists, whether at universities or in industry, who wish to keep abreast of the important advances in the covered topics. Advances in Polymer Science enjoys a longstanding tradition and good reputation in its community. Each volume is dedicated to a current topic, and each review critically surveys one aspect of that topic, to place it within the context of the volume. The volumes typically summarize the significant developments of the last 5 to 10 years and discuss them critically, presenting selected examples, explaining and illustrating the important principles, and bringing together many important references of primary literature. On that basis, future research directions in the area can be discussed. Advances in Polymer Science volumes thus are important references for every polymer scientist, as well as for other scientists interested in polymer science - as an introduction to a neighboring field, or as a compilation of detailed information for the specialist. Review articles for the individual volumes are invited by the volume editors. Single contributions can be specially commissioned. Readership: Polymer scientists, or scientists in related fields interested in polymer and biopolymer science, at universities or in industry, graduate students

Download or read book Extensional Flow Induced Crystallization of Polyethylene written by Anthony Joseph McHugh and published by . This book was released on 1972 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book String induced Crystallization of Polyethylene from Decalin a Good Solvent written by Michael Cooper and published by . This book was released on 1971 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: