研究拉伸流动场诱导PVDF/BaTiO3流延膜结晶行为研究  

Study on Crystallization Behavior of PVDF/BaTiO3 Membrane Induced by Tensile Flow Field

作　　者：宫蕾[1] GONG Lei(College of Environment and Chemical Engineering,Dalian University,Dalian 116622,China)

机构地区：[1]大连大学环境与化学工程学院,辽宁大连116622

出　　处：《塑料科技》2020年第1期19-23,共5页Plastics Science and Technology

摘　　要：利用挤出流延过程中的拉伸应力场对聚偏氟乙烯/钛酸钡(PVDF/BaTiO3)复合材料进行原位非等温拉伸试验,研究了拉伸比及BaTiO3用量对PVDF/BaTiO3流延膜结晶结构和介电性能的影响。广角X射线衍射结果表明,PVDF/BaTiO3复合膜的取向程度明显大于纯PVDF。X射线小角衍射结果显示:对于纯PVDF,第二个散射峰的强度随拉伸的进行而不断提高,在拉伸比为1.5时,其强度明显超过第一个散射峰;加入BaTiO3后,第一个散射峰的强度比纯PVDF明显提高,而第二个散射峰的强度也随拉伸比的提高而增强。复合膜的组成相同时,其介电常数随拉伸比的提高而减小,而介电损耗随拉伸比的提高而增大。The crystal structure and oriented structure of polyvinylidene fluoride(PVDF) have significant effects on the properties of PVDF-related functional materials. In this paper, the in-situ nonisothermal stretching of PVDF/BaTiO3 membrane was carried out by the tensile stress field during extrusion casting. The effects of stretching ratio and BaTiO3 content on the crystal structure and dielectric properties of PVDF/BaTiO3 membrane were investigated. The WAXD results showed that the PVDF/BaTiO3 membrane held higher orientation than pure PVDF. The SAXS results demonstrated that for pure PVDF, the intensity of the second scattering peak increased with stretching, and significantly exceeded the intensity of the first scattering peak at a stretching ratio of 1.5. After adding BaTiO3, the intensity of the first scattering peak was significantly higher than that of pure PVDF, and the intensity of the second scattering peak also enhanced with the increase of the stretching ratio. When the composition of the composite membrane is the same, the dielectric constant decreases and the dielectric loss increases with the increase of stretching ratio.

关 键 词：聚偏氟乙烯 钛酸钡 拉伸 结晶 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]