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

Mingyu, Yuan
http://rave.ohiolink.edu/etdc/view?acc_num=akron1554896306986192

Abstract Details

2019, Master of Science, University of Akron, Polymer Science.
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.
Shi-Qing Wang (Advisor)
Mesfin Tsige (Other)
49 p.
Polymers

Recommended Citations

Citations

  • Mingyu, Y. (2019). Investigation Structure-property Relationship and Origin of Stresses in Deformation of Glassy Polymers via Stress Relaxation [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1554896306986192

    APA Style (7th edition)

  • Mingyu, Yuan. Investigation Structure-property Relationship and Origin of Stresses in Deformation of Glassy Polymers via Stress Relaxation. 2019. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1554896306986192.

    MLA Style (8th edition)

  • Mingyu, Yuan. "Investigation Structure-property Relationship and Origin of Stresses in Deformation of Glassy Polymers via Stress Relaxation." Master's thesis, University of Akron, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1554896306986192

    Chicago Manual of Style (17th edition)

akron1554896306986192
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This open access ETD is published by University of Akron and OhioLINK.