Crystallization behavior of PVDF in PVDF-DMP system via thermally induced phase separation

被引:98
作者
Gu, Minghao
Zhang, Jun [1 ]
Wang, Xiaolin
Ma, Wenzhong
机构
[1] Nanjing Technol Univ, Coll Mat Sci & Engn, Nanjing 210009, Peoples R China
[2] Tsing Hua Univ, Dept Chem Engn, Beijing 100084, Peoples R China
关键词
crystallization behavior; thermally induced phase separation; PVDF; DMP; spherulite; crystal structure;
D O I
10.1002/app.24531
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 crystallization behavior of PVDF (poly (vinylidene) fluoride) in PVDF-dimethylphthalate(DMP) system was investigated in the liquid-liquid (L-L) phase separation region, solid-liquid (S-L) phase separation region and different quenching conditions via thermally induced phase separation (TIPS). Differential scanning calorimetry (DSC) indicated the crystallinity of PVDF in PVDF-DMP system increased in the early stage of phase separation and polymer-rich phase crystallized completely in the late stage of phase separation. The scanning electron microscopy (SEM) showed the different quenching temperatures had effects on the spherulite size of polymer rich phase and the ultimate membrane structure in the different phase separation regions. The wide angle Xray diffraction (WAXD) was used to quantify the crystal structure of PVDF in PVDF-DMP system. The alpha-phase PVDF was obtained when the system quenched to different temperatures above 40 degrees C, and the area of diffraction peaks changed when quenching temperatures changed. While the P-phase PVDF was formed when PVDF-DMP system was quenched form liquid nitrogen and crystallized for 24 h in 25 degrees C water bath. (c) 2006 Wiley Periodicals, Inc.
引用
收藏
页码:3714 / 3719
页数:6
相关论文
共 21 条
[1]   PIEZOELECTRICITY AND PYROELECTRICITY IN POLYVINYLIDENE FLUORIDE - MODEL [J].
BROADHURST, MG ;
DAVIS, GT ;
MCKINNEY, JE ;
COLLINS, RE .
JOURNAL OF APPLIED PHYSICS, 1978, 49 (10) :4992-4997
[2]   The effects of diluent molecular weight on the structure of thermally-induced phase separation membrane [J].
Cha, BJ ;
Char, K ;
Kim, JJ ;
Kim, SS ;
Kim, CK .
JOURNAL OF MEMBRANE SCIENCE, 1995, 108 (03) :219-229
[3]  
CHENG Y, 1990, CHIN J APPL CHEM, V7, P60
[4]   Kinetics of thermally induced phase separation in a crystallizable polymer solution [J].
Graham, PD ;
McHugh, AJ .
MACROMOLECULES, 1998, 31 (08) :2565-2568
[5]  
GREGORIO R, 1994, J POLYM SCI POL PHYS, V32, P859, DOI 10.1002/polb.1994.090320509
[6]   Formation of poly(vinylidene fluoride) (PVDF) membranes via thermally induced phase separation [J].
Gu, Minghao ;
Zhang, Jun ;
Wang, Xiaolin ;
Tao, Haijun ;
Ge, Litian .
DESALINATION, 2006, 192 (1-3) :160-167
[7]  
Hu J. C., 2002, XRAY DIFFRACTION MAC, P89
[8]  
JYOTSANA L, 1991, MACROMOLECULES, V24, P290
[9]  
KIM S, 1994, J MEMBRANE SCI, V64, P13
[10]   MICROPOROUS MEMBRANE FORMATION VIA THERMALLY INDUCED PHASE-SEPARATION .1. SOLID LIQUID-PHASE SEPARATION [J].
LLOYD, DR ;
KINZER, KE ;
TSENG, HS .
JOURNAL OF MEMBRANE SCIENCE, 1990, 52 (03) :239-261