α to β Phase Transformation and Microestructural Changes of PVDF Films Induced by Uniaxial Stretch

被引：519

作者：

Sencadas, V. ^{[1
]}

Gregorio, R., Jr. ^{[2
]}

Lanceros-Mendez, S. ^{[1
]}

机构：

[1] Univ Minho, Dept Fis, P-4710058 Braga, Portugal

[2] Univ Fed Sao Carlos, Dept Mat Engn, Sao Paulo, Brazil

来源：

JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS | 2009年 / 48卷 / 03期

基金：

巴西圣保罗研究基金会;

关键词：

ferroelectrics; mechanical properties; phase transformation; polymers; PVDF; stretching; POLY(VINYLIDENE FLUORIDE); CRYSTALLINE PHASE; TEMPERATURE; MORPHOLOGY; POLYMERS; FTIR;

D O I：

10.1080/00222340902837527

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

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.

引用

页码：514 / 525

页数：12

共 25 条

[1] Poled polymers for sensors and photonic applications [J].