α to β Phase Transformation and Microestructural Changes of PVDF Films Induced by Uniaxial Stretch
α to β Phase Transformation and Microestructural Changes of PVDF Films Induced by Uniaxial Stretch
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DOI：
10.1080/00222340902837527
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发表时间：
2009-01-01
影响因子：
1.4
通讯作者：
Lanceros-Mendez, S.
中科院分区：
文献类型：
--
作者：
Sencadas, V.;Gregorio, R., Jr.;Lanceros-Mendez, S.
研究了在不同温度下通过拉伸工艺向聚偏氟乙烯（PVDF）的相变。原-PVDF样品在不同温度下以拉伸比为1 ~ 5进行单轴拉伸。用红外光谱、扫描电镜和差示扫描量热法对拉伸后的样品进行了表征。在80C和拉伸比为5时，样品中-相含量达到最大值，但仍为原始相的20%。在相变过程中，观察到聚合物链的取向。拉伸过程也影响了聚合物的结晶度。样品的轮询也改善了-相转换。
The phase transformation from to poly(vinylidene fluoride) (PVDF) through a stretching process at different temperatures was investigated. Samples of originally -PVDF were stretched uniaxially at different temperatures at draw ratios from 1 to 5. The stretched samples were studied and characterized by infrared spectroscopy, scanning electron microscopy, and differential scanning calorimetry. The maximum -phase content was achieved at 80C and a stretch ratio of 5, but the samples still showed 20% of the original -phase. Accompanying the phase transformation, an orientation of the polymer chains was observed. The stretching process also influenced the degree of crystallinity of the polymer. Poling of the samples also improves the - to -phase transformation.