界面增强型PVDF/PET膜的制备及性能

doi:10.16085/j.issn.1000-6613.2018-0996

化工进展 ›› 2019, Vol. 38 ›› Issue (03): 1461-1467.DOI: 10.16085/j.issn.1000-6613.2018-0996

界面增强型PVDF/PET膜的制备及性能

王志英(),韩承志,宁素素,杨振生,李春利()

河北工业大学化工学院，化学过程集成与资源利用节能国家地方联合工程实验室，天津 300130

收稿日期:2018-05-14 修回日期:2018-12-03 出版日期:2019-03-05 发布日期:2019-03-05
通讯作者: 李春利
作者简介:王志英（1977—），女，博士，副教授，主要从事膜分离技术方向的研究。E-mail：ctstwzy@163.com。|李春利，教授，博士生导师，主要研究方向为化工分离过程。E-mail：ctstlcl@hebut.edu.cn。
基金资助:
河北省高等学校科学技术研究重点项目(ZD2015107)

Preparation and properties of interface enhanced PVDF/PET membrane

Zhiying WANG(),Chengzhi HAN,Susu NING,Zhensheng YANG,Chunli LI()

School of Chemical Engineering, Hebei University of Technology, National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization, Tianjin 300130, China

Received:2018-05-14 Revised:2018-12-03 Online:2019-03-05 Published:2019-03-05
Contact: Chunli LI

摘要/Abstract

摘要：

通过对支撑材料进行表面改性处理和浸入凝胶法制备了界面增强型聚偏氟乙烯/聚对苯二甲酸乙二醇酯（PVDF/PET）超滤膜。用电导率在线测量法确定了硅烷偶联剂 3-氨丙基三乙氧基硅烷（KH550）水解液的制备条件，考察了改性处理条件对PVDF/PET膜的界面性能和力学性能的影响。通过180°剥离试验测试PVDF膜与支撑层间的剥离强度，用扫描电镜观察PET无纺布及PVDF膜破坏底面的微观形貌，用傅里叶红外光谱仪表征PET表面化学组成。结果表明，水解液中KH550用量较少时（≤3%），处理时间延长，PVDF/PET间的剥离强度增大，水解液中KH550用量较多时（>3%），处理时间延长，PVDF/PET间的剥离强度先增大后减小；PVDF/PET膜的拉伸强度随水解液中KH550用量的增加或处理时间的延长先增大后略减小。改性前后PVDF/PET膜的分离与透过性能对比表明，PET表面改性后，PVDF膜的牛血清白蛋白（BSA）截留率几乎不受影响，水通量略增。

关键词: 聚偏氟乙烯, 聚对苯二甲酸乙二醇酯, 界面, 超滤膜, 性能

Abstract:

An interface-enhanced PVDF/PET ultrafiltration membrane was successfully prepared by immersion precipitation using a surface modified PET nonwoven as support material. The preparation conditions of the silane coupling agent KH550 (3-aminopropyltriethoxysilane) hydrolyzate were obtained via on-line conductivity measurement. The effects of the modification conditions on the interfacial and mechanical properties of the PVDF/PET membrane were investigated in this work. The peel strength, surface micro-morphology and chemical composition of the prepared membrane were characterized by the 180°-peel test, SEM and FTIR, respectively. When KH550 content in the hydrolysate was less than 3%, the peel strength between the PVDF and PET increased with increasing treatment time. While KH550 content in the hydrolysate was higher than 3%, the peel strength between PVDF and PET increased firstly and then decreased slightly with increasing treatment time. Furthermore, with increasing KH550 concentration or treatment time, the tensile strength of PVDF / PET membrane showed a “volcanic” trend. The separation and permeation test results indicated that the rejection of bovine serum albumin (BSA) in PVDF membrane was almost constant and the water flux increased slightly after modification the PET surface.

Key words: polyvinylidene fluoride, polyethylene terephthalate, interface, ultrafiltration membranes, properties

中图分类号:

王志英,韩承志,宁素素,杨振生,李春利. 界面增强型PVDF/PET膜的制备及性能[J]. 化工进展, 2019, 38(03): 1461-1467.

Zhiying WANG,Chengzhi HAN,Susu NING,Zhensheng YANG,Chunli LI. Preparation and properties of interface enhanced PVDF/PET membrane[J]. Chemical Industry and Engineering Progress, 2019, 38(03): 1461-1467.

图/表 8

图1 不同用量KH550的水解液电导率随时间的变化

图2 PET纤维表面、PVDF膜剥离面及膜断面的SEM图

图3 硅烷偶联剂KH550改性PET过程示意图

图4 KH550改性处理前后PET无纺布的红外谱图

图5 改性处理前后PET表面电子能谱分析

图6 KH550改性处理对PVDF/PET膜剥离强度的影响

图7 PET表面改性对PVDF/PET膜力学性能的影响

表1 PVDF/PET膜的分离性能

KH550用量	膜厚/mm	孔隙率/%	纯水通量 /L·m^-2·h^-1	BSA截留率 /%
0	0.47	74.2	1371	94.3
1%	0.54	73.8	1480	95.4
2%	0.47	74.5	1371	95.5
3%	0.47	73.7	1398	94.6
4%	0.50	73.8	1426	95.2
5%	0.44	74.9	1645	96.3
6%	0.48	74.0	1590	95.8
A^[16]	—	83	314	95
B^[17]	—	80.26	240.23	95.78
C^[18]	—	72.8	452	45

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界面增强型PVDF/PET膜的制备及性能

Preparation and properties of interface enhanced PVDF/PET membrane

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