纺织学报 ›› 2019, Vol. 40 ›› Issue (8): 20-26.doi: 10.13475/j.fzxb.20180903107

• 纤维材料 •    下一篇

编织管增强型聚乳酸中空纤维膜结构及其性能

萧传敏1,2, 肖长发1,2(), 张泰2, 王新亚1,2   

  1. 1.天津工业大学 材料科学与工程学院, 天津 300387
    2.天津工业大学 省部级共建分离膜与膜过程国家重点实验室, 天津 300387
  • 收稿日期:2018-09-13 修回日期:2019-03-10 出版日期:2019-08-15 发布日期:2019-08-16
  • 通讯作者: 肖长发
  • 作者简介:萧传敏(1994—),女,硕士生。主要研究方向为聚乳酸微孔膜。
  • 基金资助:
    国家自然科学基金项目(51673149)

Structure and properties of braided tube reinforced polylactic acid hollow fiber membranes

XIAO Chuanmin1,2, XIAO Changfa1,2(), ZHANG Tai2, WANG Xinya1,2   

  1. 1. School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China
    2. State Key Laboratory of Separation Membrane and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China
  • Received:2018-09-13 Revised:2019-03-10 Online:2019-08-15 Published:2019-08-16
  • Contact: XIAO Changfa

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摘要：

为制备兼具高强度、高分离精度的聚乳酸(PLA)中空纤维膜,采用同心圆复合纺丝技术,分别制备了PLA同质编织管与聚对苯二甲酸乙二醇酯(PET)异质编织管增强型PLA中空纤维膜。考察聚乙二醇(PEG)相对分子质量对PLA增强膜结构和性能的影响,并通过物理反冲洗、超声水浴振荡实验研究了同质、异质编织管表面分离层与增强体界面结合性能。结果表明:随PEG相对分子质量的增大,纤维膜的表面孔径逐渐减小,渗透通量先增大后减小,牛血清蛋白截留率先增大后保持稳定,添加PEG相对分子质量为10 000的增强膜的渗透通量最大且分离效果最佳;增强膜与同质编织管的界面结合性能明显优于异质的。

关键词: 聚乳酸, 聚乙二醇, 编织管增强体, 中空纤维膜, 界面结合

Abstract:

In order to prepare polylactic acid (PLA) hollow fiber membranes with high strength and high separation precision, homogenous and heterogeneous braided tube reinforced PLA hollow fiber membranes were prepared by concentric circular spinning technique. The influences of polyethylene glycol (PEG) molecular weight on the structure and properties of the homogenous reinforced membranes were investigated. Moreover, the influences of homogenous and heterogeneous braided tubes on the interfacial bonding properties were also studied by physically back washing and ultrasonically water bathing shaking.The results show that with the increase of the PEG molecular weight, the surface pores size of the membranes decreases. In addition, the permeate flux of the membranes increases firstly and then decreases, and the bovine serum albumin rejection ratio increases first and then stabilizes with the increase of the PEG molecular weight. It is also found that the interface adhesion between homogeneous braid tube and PLA hollow fiber membranes are better than the heterogeneous ones.

Key words: polylactic acid, polyethylene glycol, braided tube reinforcement, hollow fiber membrane, interfacial bonding

中图分类号: 

  • TQ028.8

图1

增强型PLA中空纤维膜纺丝流程"

表1

增强型PLA中空纤维膜组成"

试样
编号		 PLA质量
分数/%		 PEG相对
分子质量		 PEG质量
分数/%		 NMP质量
分数/%		 编织管
种类
M0 18 — — 82 PLA
M1 18 400 5 77 PLA
M2 18 2 000 5 77 PLA
M3 18 10 000 5 77 PLA
M4 18 20 000 5 77 PLA
M5 18 10 000 5 77 PET

图2

纯水通量仪装置示意图"

图3

PEG相对分子质量对铸膜液剪切黏度的影响"

图4

PEG相对分子质量对同质增强型PLA中空纤维膜结构的影响"

表2

增强型PLA中空纤维膜厚度和直径测试结果"

试样编号 内径 外径 分离层厚度
M0 0.81 2.026 0.118
M1 0.81 2.004 0.107
M2 0.81 1.986 0.098
M3 0.81 1.978 0.094
M4 0.81 1.970 0.090

图5

PEG相对分子质量对同质增强型PLA中空纤维膜孔隙率和水接触角的影响"

图6

PEG相对分子质量对同质增强型PLA中空纤维膜渗透通量和截留率的影响"

图7

同质增强型PLA中空纤维膜的应力-应变曲线"

图8

同质与异质增强型PLA中空纤维膜的横截面结构"

图9

超声波水浴振荡处理对同质与异质增强型PLA中空纤维膜孔径分布的影响"

图10

超声波水浴振荡处理对增强型PLA中空纤维膜纯水通量和截留率的影响"

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