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Molecular Mobility in Deforming Polymer Glasses

2021-10-15 Science
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Release : 2021-10-15
Genre : Science
Kind : eBook
Book Rating : 590/5 ( reviews)

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Book Synopsis Molecular Mobility in Deforming Polymer Glasses by : Nikhil Padhye

Download or read book Molecular Mobility in Deforming Polymer Glasses written by Nikhil Padhye. This book was released on 2021-10-15. Available in PDF, EPUB and Kindle. Book excerpt: This book bridges disparate fields in an exploration of the phenomena and applications surrounding molecular mobility in glassy materials experiencing inelastic deformation. The subjects of plastic deformation and polymer motion/interdiffusion currently belong to the two different fields of continuum mechanics and polymer physics, respectively. However, molecular motion associated with plastic deformation is a key ingredient to gain fundamental understanding, both at the macroscopic and microscopic level. This short monograph provides necessary background in the aforementioned fields before addressing the topic of molecular mobility accompanied by macroscopic inelastic deformation in an accessible and easy-to-understand manner. A new phenomenon of solid-state deformation-induced bonding in polymers is discussed in detail, along with some broad implications in several manufacturing sectors. Open questions pertaining to mechanisms, mechanics, and modeling of deformation-induced bonding in polymers are presented. The book’s clear language and careful explanations will speak to readers of diverse backgrounds.

Polymer Glasses

2016-12-12 Science
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Release : 2016-12-12
Genre : Science
Kind : eBook
Book Rating : 135/5 ( reviews)

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Book Synopsis Polymer Glasses by : Connie B. Roth

Download or read book Polymer Glasses written by Connie B. Roth. This book was released on 2016-12-12. Available in PDF, EPUB and Kindle. Book excerpt: "the present book will be of great value for both newcomers to the field and mature active researchers by serving as a coherent and timely introduction to some of the modern approaches, ideas, results, emerging understanding, and many open questions in this fascinating field of polymer glasses, supercooled liquids, and thin films" –Kenneth S. Schweizer, Morris Professor of Materials Science & Engineering, University of Illinois at Urbana-Champaign (from the Foreword) This book provides a timely and comprehensive overview of molecular level insights into polymer glasses in confined geometries and under deformation. Polymer glasses have become ubiquitous to our daily life, from the polycarbonate eyeglass lenses on the end of our nose to large acrylic glass panes holding water in aquarium tanks, with advantages over glass in that they are lightweight and easy to manufacture, while remaining transparent and rigid. The contents include an introduction to the field, as well as state of the art investigations. Chapters delve into studies of commonalities across different types of glass formers (polymers, small molecules, colloids, and granular materials), which have enabled microscopic and molecular level frameworks to be developed. The authors show how glass formers are modeled across different systems, thereby leading to treatments for polymer glasses with first-principle based approaches and molecular level detail. Readers across disciplines will benefit from this topical overview summarizing the key areas of polymer glasses, alongside an introduction to the main principles and approaches.

Investigation of Segmental Dynamics in Polymer Glasses During Constant Strain Rate Deformation

2014
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Release : 2014
Genre :
Kind : eBook
Book Rating : /5 ( reviews)

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Book Synopsis Investigation of Segmental Dynamics in Polymer Glasses During Constant Strain Rate Deformation by :

Download or read book Investigation of Segmental Dynamics in Polymer Glasses During Constant Strain Rate Deformation written by . This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: We have used optical measurements of dye reorientation to investigate the molecular dynamics of polymer glasses during deformation. In our work we have developed new instrumentation to perform constant strain rate deformations of polymer glasses while simultaneously measuring segmental mobility. By expanding our deformation protocols from creep and recovery to constant strain rate we have found that our molecular mobility measurement is more closely relevant to the theories, models, and simulations that the polymer glass deformation community is developing. We found that mobility was enhanced during deformation up to the yield point by a factor of 40 to 160 compared to the undeformed glass. In the postyield regime, this enhancement of mobility remained constant during the deformation. Finally, we found that high strain rates lead to higher postyield mobility, and that the mobility was correlated with the local strain rate as we have found previously with creep deformation experiments. The experimental features of the mobility enhancement, and its correlation with strain rate, are compared to computer simulations and theoretical models. This work significantly increases our understanding of molecular mobility during different types of deformations and shows the generalities of the measurement across many different systems. We have now found that the correlation of mobility and local strain rate is extremely robust across temperatures, types of deformations (postyield), and polymer glasses. We have also determined that a decrease in dynamic heterogeneity is a result of the deformation being applied to the polymer glass. By finding these generalities across different polymer glasses under different deformations, we can help provide the tools to create more accurate predictive models and simulations of polymer glass deformation.

Polymer Glasses

2016-12-12 Science
Download Polymer Glasses PDF Online Free

Author :
Release : 2016-12-12
Genre : Science
Kind : eBook
Book Rating : 143/5 ( reviews)

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Book Synopsis Polymer Glasses by : Connie B. Roth

Download or read book Polymer Glasses written by Connie B. Roth. This book was released on 2016-12-12. Available in PDF, EPUB and Kindle. Book excerpt: "the present book will be of great value for both newcomers to the field and mature active researchers by serving as a coherent and timely introduction to some of the modern approaches, ideas, results, emerging understanding, and many open questions in this fascinating field of polymer glasses, supercooled liquids, and thin films" –Kenneth S. Schweizer, Morris Professor of Materials Science & Engineering, University of Illinois at Urbana-Champaign (from the Foreword) This book provides a timely and comprehensive overview of molecular level insights into polymer glasses in confined geometries and under deformation. Polymer glasses have become ubiquitous to our daily life, from the polycarbonate eyeglass lenses on the end of our nose to large acrylic glass panes holding water in aquarium tanks, with advantages over glass in that they are lightweight and easy to manufacture, while remaining transparent and rigid. The contents include an introduction to the field, as well as state of the art investigations. Chapters delve into studies of commonalities across different types of glass formers (polymers, small molecules, colloids, and granular materials), which have enabled microscopic and molecular level frameworks to be developed. The authors show how glass formers are modeled across different systems, thereby leading to treatments for polymer glasses with first-principle based approaches and molecular level detail. Readers across disciplines will benefit from this topical overview summarizing the key areas of polymer glasses, alongside an introduction to the main principles and approaches.

Relaxation in Physical and Mechanical Behavior of Polymers

2019-01-30 Science
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Release : 2019-01-30
Genre : Science
Kind : eBook
Book Rating : 736/5 ( reviews)

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Book Synopsis Relaxation in Physical and Mechanical Behavior of Polymers by : Maxim Arzhakov

Download or read book Relaxation in Physical and Mechanical Behavior of Polymers written by Maxim Arzhakov. This book was released on 2019-01-30. Available in PDF, EPUB and Kindle. Book excerpt: Explores the nature of relaxation phenomena in polymers on the basis of time-temperature equivalence. Its role in the physical and mechanical behavior of polymers materials and fundamentals of thermoplastics processing are discussed. Four appendixes detail thermo-mechanical methods to study relaxation in polymers, structure of both amorphous and semi-crystalline polymers, and unified approach to describe deformation of polymeric materials.

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