Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (07): 8-12.doi: 10.13475/j.fzxb.20180709706

• Fiber Materials • Previous Articles     Next Articles

Influence of cooling temperature on structure and properties of polyvinylidene fluoride/ultrahigh-molecular-weight polyethylene blends hollow fiber membrane

LI Nana1, LU Qingchen2, YIN Weiwei2, XIAO Changfa1   

  1. 1. State Key Laboratory of Separation Membrane and Membranes Processes, Tianjin Polytechnic University, Tianjin 300387, China
    2. School of Textile Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China
  • Received:2018-07-31 Revised:2019-04-08 Online:2019-07-15 Published:2019-07-25

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Abstract:

In order to solve the problem of hard synchronous increase strength and permeability of polyvinylidene fluoride(PVDF) membrane, PVDF/ultrahigh-molecular-weight polyethylene(UHMWPE) blends hollow fiber membranes were prepared by thermally induced phase separation, using mineral oil and dibutyl phthalate as mixed diluents. The influences of different cooling temperatures on the morphology and pore structure of the membrane were investigated. Permeability and mechanical properties of hollow fiber membranes were characterized by gas flux, water flux and tensile strength. The results show that fibrillar UHMWPE increases the connectivity of PVDF spherulitic aggregates. The cooling temperature has a significant influence on the structure and properties of the blends hollow fiber membrane. With the cooling temperature increases, the time of phase separation and crystallization of blends system(PVDF/dibutyl phthalate and UHMWPE/mineral oil) are prolonged. The average pore size and porosity of the membrane increase, which improves the membrane permeability. However, the appearance of large pores and the decrease of UHMWPE fibrils reduce the mechanical properties of the membrane.

Key words: hollow fiber membrane, thermally induced phase separation, polyvinylidene fluoride, ultrahigh-molecular-weight polyethylene, cooling temperature

CLC Number: 

  • TB324

Fig.1

FESEM cross-section images of PVDF/UHMWPE blending hollow fiber membrane at different cooling temperatures"

Fig.2

Pore diameter distribution of PVDF/UHMWPE blending hollow fiber membrane at different cooling temperatures"

Tab.1

Average pore diameter and porosity of PVDF/UHMWPE blending hollow fiber membrane at different cooling temperatures"

冷却温度/℃ 孔隙率/% 平均孔径/nm
20 74.0 1 045
35 76.2 1 104
50 77.8 1 154
65 81.1 1 227

Tab.2

Flux and contact angle of PVDF/UHMWPE blending hollow fiber membrane at different cooling temperatures"

冷却温度/
℃		 气通量/
(L·m-2·h-1)		 水通量/
(L·m-2·h-1)		 接触角/
(°)
20 892 1 525 76.8
35 920 1 721 100.5
50 951 1 946 108.5
65 970 2 170 117.8

Tab.3

Tensile strength and elongation at break of PVDF/UHMWPE blending hollow fiber membrane at different cooling temperatures"

冷却温度/℃ 拉伸强度/MPa 断裂伸长率/%
20 4.7 182.3
35 4.2 160.2
50 3.5 150.6
65 3.1 128.1
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