TY - JOUR
T1 - Phase transformation and thermomechanical characteristics of stretched polyvinylidene fluoride
AU - Chang, Wen Yang
AU - Fang, Te Hua
AU - Liu, Shu Yuan
AU - Lin, Yu Cheng
N1 - Funding Information:
The test facilities and resources for this study are supported from the Ministry of Economic Affairs to fund environment construction project of Taiwan government.
PY - 2008/5/15
Y1 - 2008/5/15
N2 - Phase transformation and thermomechanical characteristics of the polyvinylidene fluoride (PVDF) are investigated using a microtesting machine and a thermomechanical analyzer. The phase transformation from the α- to β-phase of the PVDF resulted from increased PVDF chain length caused by the stretching procedure. The results show that the phase transformation changed due to increased stretching ratios with smaller changes for stretching ratios over 4. Young's modulus along the stretching direction was higher than that along the transverse of stretching. The thermomechanical curve variation can be divided into two parts: one part is a gradual slope before about 50 °C, and the other is similar to exponential growth. Thermomechanical change, thermal elongation, and expansion greatly influence the stretching ratios of 5 in the stretching direction. The higher stretching ratio easily causes the shrink influence of the material due to the higher cohesion of the amorphous regions. Therefore, the observed results can provide useful information to optimize for piezoelectric or pyroelectric PVDF applications.
AB - Phase transformation and thermomechanical characteristics of the polyvinylidene fluoride (PVDF) are investigated using a microtesting machine and a thermomechanical analyzer. The phase transformation from the α- to β-phase of the PVDF resulted from increased PVDF chain length caused by the stretching procedure. The results show that the phase transformation changed due to increased stretching ratios with smaller changes for stretching ratios over 4. Young's modulus along the stretching direction was higher than that along the transverse of stretching. The thermomechanical curve variation can be divided into two parts: one part is a gradual slope before about 50 °C, and the other is similar to exponential growth. Thermomechanical change, thermal elongation, and expansion greatly influence the stretching ratios of 5 in the stretching direction. The higher stretching ratio easily causes the shrink influence of the material due to the higher cohesion of the amorphous regions. Therefore, the observed results can provide useful information to optimize for piezoelectric or pyroelectric PVDF applications.
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U2 - 10.1016/j.msea.2007.07.042
DO - 10.1016/j.msea.2007.07.042
M3 - Article
AN - SCOPUS:41149136826
SN - 0921-5093
VL - 480
SP - 477
EP - 482
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 1-2
ER -