Effect of Surface Spraying Chitosan Solution on Structure and Properties of Polyvinylidene Fluoride Porous Membrane

doi:10.11901/1005.3093.2019.523

Chinese Journal of Materials Research

2020, Vol. 34

Issue (6): 466-472 DOI: 10.11901/1005.3093.2019.523

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Effect of Surface Spraying Chitosan Solution on Structure and Properties of Polyvinylidene Fluoride Porous Membrane

CHENG Shijie, WANG Chenyang, YIN Shuyi, ZHANG Hongwei, ZUO Danying(

)

State Key Laboratory for Hubei New Textile Materials and Advanced Processing Technology, Wuhan Textile University, Wuhan 430020, China

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CHENG Shijie, WANG Chenyang, YIN Shuyi, ZHANG Hongwei, ZUO Danying. Effect of Surface Spraying Chitosan Solution on Structure and Properties of Polyvinylidene Fluoride Porous Membrane. Chinese Journal of Materials Research, 2020, 34(6): 466-472.

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Abstract

After spraying acetic acid solution of chitosan (CS) on polyvinylidene fluoride (PVDF) solution film, PVDF porous membrane was prepared by immersion precipitation phase inversion method. The effect of the volume of CS solution on the structure and properties of porous membrane was investigated, and the mechanism of membrane formation was discussed. The results show that with the increase of CS solution volume the porosity and the surface hydrophilicity of the prepared PVDF membrane increased, the content of β crystal on the top surface decreased, while the content of α crystal increased. The top surface of plain PVDF membrane prepared with the PVDF solution film without sprayed CS solution has dense structure, while the upper surface of PVDF membrane prepared with the PVDF solution film after CS solution spraying has porous structure. The cross-section structure of all PVDF membranes is finger like macroporous structure. When CS solution volume was 2 mL, 4 mL and 6 mL, the water flux of corresponding PVDF membranes first increased and then decreased, which are 683.33 L/m²h, 1121.57 L/m²h, 1171.36 L/m²h and 1029.02 L/m²h, respectively. The difference in structure and properties of PVDF membranes prepared with different procedure was mainly due to the different formation mechanism for the top layer of the membranes.

Key words: surface and interface in the materials polyvinylidene fluoride porous membrane chitosan spraying membrane structure water flux

Received: 11 November 2019

ZTFLH:

TQ028.8

Fund: Hubei Natural Science Foundation(2018CFB267)

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	Shijie CHENG
	Chenyang WANG
	Shuyi YIN
	Hongwei ZHANG
	Danying ZUO

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.523 OR https://www.cjmr.org/EN/Y2020/V34/I6/466

Table 1 Properties of PVDF membranes with different spraying volumes of CS solution

Fig.1 Infrared spectroscopy of PVDF membranes with different spraying volumes of CS solution

Fig.2 Infrared spectroscopy of PVDF different membranes in range of 400~1000 nm wavenumber

Table 2 Energy spectrum analysis of PVDF membrane and PVDF membrane with spraying 4 mL CS solution

Fig.3 SEM photos of PVDF membranes with different spraying volume of CS solution (A) top surface, (B) bottom surface, (C) cross section

Fig.4 Variation curve of water flux of PVDF membranes with different CS spraying volume

Fig.5 Relations of porosity, mean pore diameter and water flux with four PVDF membranes

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