摘要
<正> 聚偏氟乙烯(PVF_2)的多晶型、压电和热电性引起人们关注。一般认为PVF_2有α、β、γ、δ4种晶相,另有报道存在一ε相。其中具有压电和热电性的β相最为重要。通常从PVF_2熔体只能获得α相。为了获得β相结晶,人们尝试过很多方法。本文研究拉伸过程中PVF_2结构和晶相的变化。PVF_2为Polysciences产品,MW 1.4×10~5。经熔体拉伸制成厚50nm的取向膜。仪器为H-600型透射电镜,工作电压100kV。以及Alpha Cenfauri付利叶变换红外光谱仪。
Deformation process and phase transition of the oriented films of poly(vinylidene fluoride) (PVF_2) have been investigated by electron microscopy,electron diffraction and FTIR. The films prepared by a melt drawn technique contain highly oriented larnellae, which predominantly consist of a phase. During the course of stretching the fibrillar crystals are formed,accompanied by a α→β phase transition. Increasing deformation temperature is of no advantage to the α→β phase transition.
出处
《应用化学》
CAS
CSCD
北大核心
1993年第2期115-116,共2页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金
关键词
聚偏氟乙烯
晶相
取向薄膜
拉伸
poly(vinylidene fluoride) ,morphology,crystal phase