Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (8): 20-26.doi: 10.13475/j.fzxb.20180903107

• Fiber Materials •     Next Articles

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 E-mail:xiaochangfa@163.com

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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

CLC Number: 

  • TQ028.8

Fig.1

Spinning process of reinforced PLA hollow fiber membranes"

Tab.1

Composition of reinforced PLA hollow fiber membranes"

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

Fig.2

Pure water flux meter device schematic"

Fig.3

Effect of PEG molecular weight on shear viscosity of casting solution"

Fig.4

Effect of PEG molecular weight on structure of reinforced PLA hollow fiber membranes. (a) Cross-section; (b) Cross-section local enlargement; (c) Surface"

Tab.2

Test results of thickness and diameter of reinforced PLA hollow fiber membranesmm"

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

Fig.5

Effect of PEG molecular weight on porosity and contact angle of reinforced PLA hollow fiber membranes"

Fig.6

Effect of PEG molecular weight on permeate flux(a) and BSA rejection(b) ratio of reinforced PLA hollow fiber membranes"

Fig.7

Stress-strain curves of reinforced PLA hollow fiber membranes"

Fig.8

Cross-section structure of homogeneous (a) and heterogeneous (b) reinforced PLA hollow fiber membranes"

Fig.9

Effect of ultrasonic water bath oscillation on pore size distribution of homogeneous and heterogeneous reinforced PLA hollow fiber membranes"

Fig.10

Effect of ultrasonic water bath oscillation on pure water flux (a) and BSA rejection ratio (b) of reinforced PLA hollow fiber membranes"

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