文章摘要
热致相分离法聚偏氟乙烯多孔膜制备及微结构调控
Preparation and Microstructure Control of Thermally Induced Phase Separation Poly(vinylidene fluoride) Porous Membrane
  
DOI:10.16865/j.cnki.1000-7555.2018.03.028
中文关键词: 聚偏氟乙烯  热致相分离法  混合稀释剂  平板膜
英文关键词: poly(vinylidene fluoride)  thermally induced phase separation  mixed diluent  flat-sheet membrane
基金项目: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)
作者单位
刘海亮,王世乾,肖长发,刘 振 天津工业大学 省部共建分离膜与膜过程国家重点实验室/分离膜科学与技术国家级国际合作研究中心 材料科学与工程学院,天津 300387 
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中文摘要:
      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。
英文摘要:
      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.
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