球晶(高分子物理)
材料科学
相(物质)
光学显微镜
Crystal(编程语言)
变形(气象学)
复合材料
压电
极限抗拉强度
结晶学
扫描电子显微镜
聚合物
化学
有机化学
计算机科学
程序设计语言
作者
Li Li,Mingqiu Zhang,Min Zhi Rong,Wenhong Ruan
出处
期刊:RSC Advances
[The Royal Society of Chemistry]
日期:2014-01-01
卷期号:4 (8): 3938-3943
被引量:267
摘要
Poly(vinylidene fluoride) (PVDF) has excellent pyro- and piezoelectric properties which are related to the β-crystal of PVDF. Most of the β-crystal of PVDF can be transformed from the α-crystal by mechanical stretching. The effects of stretching conditions on the transformation from α to β phase of PVDF were studied in this paper. In addition, changes of crystalline structure of PVDF during the stretching process were observed in situ under an optical tensile stress microscopy tester, and the samples after being stretched were investigated using a 3D digital microscope and an infrared microscope. The results show that stretching temperature (Ts) and drawing ratio (λ) are critical to the transformation from α-crystal to β-crystal of PVDF. The Ts around 100 °C and λ above 3 is recommended. The in situ observation indicates that the deformation of crystalline structure began from the middle of α-spherulite and extended to another spherulite, and caused the large-scale transformation. Scanning results of infrared microspectroscopic and 3D digital microscopy revealed that α phase of PVDF would change into β phase with the deformation of the spherulite, and the distribution of the different crystalline phase in PVDF after being stretched was also given. It is believed that this work is instructive and meaningful to studies on phase transformation and production of the piezoelectric film of PVDF.
科研通智能强力驱动
Strongly Powered by AbleSci AI