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The study of mechanical responses in both uniaxial extension and compression of polymer glasses

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2016, Doctor of Philosophy, University of Akron, Polymer Science.
The study of polymer glasses is an important subject in research on polymeric materials. Although a lot of efforts have been made in the past several decades, there is still no satisfactory understanding at a molecular level to explain many nonlinear mechanical responses. For example, what determines the mechanical strength in polymer glasses? Why some polymers can be ductile but the others behave in a brittle manner? In this work, we carried out a series of experiments to study the mechanical responses in both uniaxial extension and compression in an effort to collect more phenomenology. By combining the mechanical measurements with in situ temperature reading, significant buildup of internal energy was observed to take place during large deformation. Elastic yielding experiments were then carried out to elucidate the intra-segmental nature of such internal energy. Inter-segmental interactions were also found to contribute to the stored internal energy. Upon exposure to gamma irradiation, chain network is demonstrated to be essential to preserve chain tension and produce elastic yielding. In addition, we also studied the crazing behavior of polymer glasses. Specifically, it is shown that mechanical rejuvenation through either milling or twisting, suppresses crazing in extension of PC. Crazing re-surfaces upon annealing of the mechanically-rejuvenated PC. A tentative proposal is made to offer an explanation.
Shi-Qing Wang, Dr. (Advisor)
Mesfin Tsige, Dr. (Committee Chair)
Stephen Z.D. Cheng, Dr. (Committee Member)
Toshikazu Miyoshi, Dr. (Committee Member)
David Simmons, Dr. (Committee Member)
153 p.

Recommended Citations

Citations

  • Lin, P. (2016). The study of mechanical responses in both uniaxial extension and compression of polymer glasses [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1459947697

    APA Style (7th edition)

  • Lin, Panpan. The study of mechanical responses in both uniaxial extension and compression of polymer glasses. 2016. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1459947697.

    MLA Style (8th edition)

  • Lin, Panpan. "The study of mechanical responses in both uniaxial extension and compression of polymer glasses." Doctoral dissertation, University of Akron, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1459947697

    Chicago Manual of Style (17th edition)