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The Study of Mechanical Responses in Both Uniaxial Extension and Compression of Polymer Glasses
Başlık:
The Study of Mechanical Responses in Both Uniaxial Extension and Compression of Polymer Glasses
Yazar:
Lin, Panpan, author.
ISBN:
9780438091160
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (151 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Advisors: Shi-Qing Wang Committee members: Stephen Z. D. Cheng; Toshikazu Miyoshi; David Simmons; Mesfin Tsige.
Özet:
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.
Notlar:
School code: 0003
Tüzel Kişi Ek Girişi:
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(686991.1) | 686991-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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