摘要
以邻苯二甲酸二辛酯(DBP)和己二酸二辛酯(DOA)组成混合稀释剂,采用热致相分离法(TIPS)制备了聚偏氟乙烯(PVDF)平板膜。通过冷场发射扫描电子显微镜观察所得膜形貌,采用差示扫描量热仪测试膜热力学性能,并对其渗透性能及力学性能进行测试表征。研究了稀释剂配比与聚合物浓度对PVDF平板膜结构和性能的影响。结果表明,PVDF/DBP/DOA体系成膜过程以S-L分相为主,呈典型的球晶结构。随PVDF浓度和混合稀释剂中DOA比例增加,膜横截面球晶结构尺寸及球晶结构晶粒间空隙均变小,同时膜表面孔隙率减小,致密度增加。此外,混合稀释剂中DOA比例增加,能够改善膜的力学性能,但会减小膜的纯水通量。
Poly（vinylidene fluoride） （PVDF） flat membranes were prepared via thermally induced phase separation （TIPS） process using mixed diluent of dibutyl phthalate （DBP） and dioctyl adipate （DOA）. The properties and structure of the porous membrane were characterized by field emission scanning electron microscope （FESEM）, porosity, flux test, contact angle test, mechanical properties test and differential scanning calorimetry （DSC）. The effects of PVDF concentration and mixed diluent composition on the structure and properties of the membranes were investigated. The results show that PVDF/DBP/DOA systems in the membrane formation process are mainly S-L phase separation, which show spherulites structure. With increase of the PVDF concentration and DOA ratio in mixed diluent, the size of membrane cross-sectional spherulites structure reduces, the membrane surface porosity is reduced and the density is increased. In addition, as the DOA ratio in mixed diluent increases, the mechanical properties change better, but the flux decreases.
作者
刘海亮
王世乾
肖长发
刘振
Hailiang Liu, Shiqian Wang, Changfa Xiao, Zhen Liu(State Key Laboratory of Separation Membrane and Membrane Processes/National Center for International Joint Research on Separation Membranes, School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2018年第3期161-167,共7页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(51603146)
天津市科技计划项目(课题)(15PTSYJC00240)
关键词
聚偏氟乙烯
热致相分离法
混合稀释剂
平板膜
poly（vinytidene fluoride）
thermally induced phase separation
mixed diluent
flat-sheet membrane
