Investigation Structure-property Relationship and Origin of Stresses in Deformation of Glassy Polymers via Stress Relaxation

Investigation Structure-property Relationship and Origin of Stresses in Deformation of Glassy Polymers via Stress Relaxation

Bibliographic Details
Main Author: Mingyu, Yuan
Language:English
Published: University of Akron / OhioLINK 2019
Subjects:
Polymers
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=akron1554896306986192
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-akron15548963069861922021-08-03T07:10:08Z Investigation Structure-property Relationship and Origin of Stresses in Deformation of Glassy Polymers via Stress Relaxation Mingyu, Yuan Polymers Glassy polymers are an important class of polymeric materials. Understanding their mechanical properties, for example, the origin of stresses in large deformation is of great practical interest. Intrachain retraction forces of load-bearing-strands in melt deformation is widely regarded as a dominant contribution to stress growth1, but for polymer glasses, it is far less clear. Previous experiments show that tensile stress vanished on alpha time scales after pre-yield deformation of glassy polymers while staying high after postyield deformation and relaxes on much longer time scales2. Such behavior suggests that the post-yield stress contains a significant contribution from chain networking.In this work, we investigated whether large deformation can suppress segmental relaxation or not by performing superimposed step strain tests in both extension and compression. In addition, compression relaxation tests under different temperatures and rates were carried out to explore temperature/rate dependences of the relaxation dynamics. Also, to further examine how structure-property relationship controls the mechanical response, stress relaxation behaviors of pure poly (methyl methacrylate) (PMMA) and core-shell structure PMMA were compared. 2019-06-21 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1554896306986192 http://rave.ohiolink.edu/etdc/view?acc_num=akron1554896306986192 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Polymers
spellingShingle Polymers
Mingyu, Yuan
Investigation Structure-property Relationship and Origin of Stresses in Deformation of Glassy Polymers via Stress Relaxation
author Mingyu, Yuan
author_facet Mingyu, Yuan
author_sort Mingyu, Yuan
title Investigation Structure-property Relationship and Origin of Stresses in Deformation of Glassy Polymers via Stress Relaxation
title_short Investigation Structure-property Relationship and Origin of Stresses in Deformation of Glassy Polymers via Stress Relaxation
title_full Investigation Structure-property Relationship and Origin of Stresses in Deformation of Glassy Polymers via Stress Relaxation
title_fullStr Investigation Structure-property Relationship and Origin of Stresses in Deformation of Glassy Polymers via Stress Relaxation
title_full_unstemmed Investigation Structure-property Relationship and Origin of Stresses in Deformation of Glassy Polymers via Stress Relaxation
title_sort investigation structure-property relationship and origin of stresses in deformation of glassy polymers via stress relaxation
publisher University of Akron / OhioLINK
publishDate 2019
url http://rave.ohiolink.edu/etdc/view?acc_num=akron1554896306986192
work_keys_str_mv AT mingyuyuan investigationstructurepropertyrelationshipandoriginofstressesindeformationofglassypolymersviastressrelaxation
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