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Dissertation -Zhichen Zhao v2.0.pdf (10.33 MB)

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Understanding melt-deformation effect on mechanical behavior of polymer glasses

Zhao, Zhichen
http://rave.ohiolink.edu/etdc/view?acc_num=akron1555001830982788

Abstract Details

2019, Doctor of Philosophy, University of Akron, Polymer Science.
Polymer glasses play a key role in manufacture and industrial field in terms of their mechanical properties. Despite tremendous efforts in the past on exploring the mechanical instabilities of polymer glasses, it remains vague and under debate regarding the approach to improve mechanical properties of polymeric glass, the molecular origin of stress and the nature of the brittle- ductile transition. In this dissertation, we investigate the effects of melt deformation on mechanical behavior of polymer glasses in two separate ways. In first project, we apply planar extension in melt state to induce anisotropic network structure. Such a pre-deformed sample is predicted to show anisotropic deformation or fracture depending the direction of compression. The observed mechanical responses extends our theoretical understanding of glassy polymer under large deformation. Specifically, these experimental findings illustrate the explicit role of chain networking in compression and support the idea that the lateral chain networking resists the transverse expansion. In second project, in terms of tensile responses, we examine how and why retractive stress could show up during annealing of melt-deformed sample in its glassy state. Melt stretching may have produced non-negligible distortions at the bond level as well as a reduction of energy barrier, resulting in a rejuvenated glassy state.
Shi-Qing Wang (Advisor)
134 p.
Polymers
polymer glasses

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Citations

  • Zhao, Z. (2019). Understanding melt-deformation effect on mechanical behavior of polymer glasses [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1555001830982788

    APA Style (7th edition)

  • Zhao, Zhichen. Understanding melt-deformation effect on mechanical behavior of polymer glasses. 2019. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1555001830982788.

    MLA Style (8th edition)

  • Zhao, Zhichen. "Understanding melt-deformation effect on mechanical behavior of polymer glasses." Doctoral dissertation, University of Akron, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1555001830982788

    Chicago Manual of Style (17th edition)

akron1555001830982788
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© 2019, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.