Deformation and fracture behavior of high‐energy electron irradiated poly(vinylidene fluoride‐trifluorethylene) ferroelectric copolymer films under uniaxial tension |
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| Authors: | F Fang W Yang M Z Zhang Z Wang |
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| Institution: | 1. Failure Mechanics Laboratory, School of Aerospace, Tsinghua University, Beijing 100084, ChinaFailure Mechanics Laboratory, School of Aerospace, Tsinghua University, Beijing 100084, China;2. Failure Mechanics Laboratory, School of Aerospace, Tsinghua University, Beijing 100084, China;3. Zhejiang University, Hangzhou 310027, China |
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| Abstract: | The deformation and fracture behavior under uniaxial tension were characterized for high‐energy irradiated poly(vinylidene fluoride‐trifluorethylene) (P(VDF‐TrFE)) 68/32 mol % copolymer films. The results show that the stress–strain behavior of the irradiated copolymer films exhibits ductile polymeric behavior, with its fracture strain being more than five times of that of the nonirradiated ones but of much lower maximum strength. X‐ray diffraction (XRD) analysis and scanning electron microscope (SEM) observation are carried out to examine the microstructure and morphology changes caused by the uniaxial tension. It is demonstrated that the tensile mechanical field reintroduces the polar β‐phase that was previously lost through irradiation. It is suggested that the conformational change from the nonpolar phase to the polar β‐phase during the uniaxial tension, as well as the low crystallinity and loosely packed molecular chain structure, mainly contribute to the observed stress–strain behavior for the irradiated copolymer films. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 2563–2567, 2007 |
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| Keywords: | films fracture irradiation uniaxial |
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