Morphology of membranes formed by the isothermal precipitation of polyamide solutions from water/formic acid systems
Morphology of membranes formed by the isothermal precipitation of polyamide solutions from water/formic acid systems
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DOI：
10.1002/app.21545
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发表时间：
2005-05-05
影响因子：
3
通讯作者：
Cheng, LP
中科院分区：
文献类型：
--
作者：
Shih, CH;Gryte, CC;Cheng, LP
通过将聚酰胺溶液直接等温浸入甲酸/水浴中来制备膜。结晶聚己内酰胺均聚物、尼龙6以及尼龙6、尼龙66和尼龙610的大部分非晶态三元共聚物从溶液中沉淀出来，在膜的顶部和底部表面以及横截面上形成复杂的形态。三元共聚物膜表现出液-液相分离过程的特征。根据溶液和浴的条件，尼龙6沉淀形成膜，表现出结晶或液-液相分离的优势。通过从含有高浓度非溶剂的溶液中沉淀到含有高浓度甲酸的浴中，形成无皮尼龙6 0 微孔膜。 (c) 2005 年 Wiley 期刊公司。
Membranes were prepared by the direct and isothermal immersion of polyamide solutions in a formic acid/water bath. A crystalline polycaprolactam homopolymer, nylon 6, and a largely amorphous terpolymer of nylon 6, nylon 66, and nylon 610 were precipitated from Solutions to form complex morphologies on the top and bottom Surfaces and cross sections of the membranes. Terpolymer membranes exhibited the characteristics of a liquid-liquid phase-separation process. According to the conditions of the solution and bath, nylon 6 precipitated to form membranes that showed dominance of crystallization or liquid-liquid phase separation. By precipitation from a solution containing a high concentration of a nonsolvent into a bath containing a hi-h concentration of formic acid, skinless nylon 6 0 microporous membranes were formed. (c) 2005 Wiley Periodicals, Inc.