摘要
为解决聚乙烯醇(PVA)直接成膜后易在水中发生溶胀甚至溶解的问题,叙述了通过溶液共混、化学交联等对PVA膜的力学性能、抗水性能进行改性,引入纳米粒子、对底膜进行亲水性预处理以提高复合膜的水通量,以及利用PVA分子链上的羟基进行交联反应以提高复合膜的截留性能的方法。认为选用阴离子表面活性剂可在水中发生解离形成阴离子基团,有效增大基膜表面的亲水性,有助于PVA均匀牢固地附着在基膜上。通过降低功能层的厚度进而减少水通过的阻力,以获得更大的水通量;利用超支化聚酯高度支化的三维结构,与PVA铸膜液共混以提高PVA复合膜分离性能,是非常有潜力的发展方向。
To solve the problems of polyvinyl alcohol（PVA） which is easy to expand and even dissolve in water after film formation directly. The mechanical properties and water resistance of PVA films were modified by solution blending and chemical crosslinking. The hydrophilic pretreatment of the substrate membrane with nanoparticles was carried out to improve the water flux of the composite membrane. The interlinking reaction of the hydroxyl group on the molecular chain of PVA was also used to improve the retention property of the composite membrane. Anion group would be formed by anionic surfactant dissociation in water, which enhanced the hydrophilia of basement membrane surface and contributed to PVA attached to the basement membrane firmly. The water resistance reduced with the decrease of the thickness of functional layer, so as to obtain greater water flux. The 3 d structure of hyperbranched polyester was mixed with PVA casting solution to improve the separation performance of PVA composite membrane, which is a potential development direction.
作者
郭淼
王书浩
周勇
高从堦
GUO Miao;WANG Shuhao;ZHOU Yong;GAO Congjie(Ocean College,Zhejiang University of Technolog)
出处
《水处理技术》
CAS
CSCD
北大核心
2018年第10期1-5,共5页
Technology of Water Treatment
基金
国家重点研发计划项目(2016YFC0401508)
关键词
聚乙烯醇膜改性
力学性能
抗水性能
水通量
抗污染
超支化
PVA membrane modification
mechanical property
water resistance
water flux
anti-pollution
hyperbranched
