Effect of non-solvents used in the coagulation bath on morphology of PVDF membranes

Materials Research

Mônica Beatriz Thürmer²  Patrícia Poletto¹  Marcos Marcolin¹  Jocelei Duarte¹  Mara Zeni¹ 

[1] ,Universidade Federal do Rio Grande do Sul Materials Engineering Department Porto Alegre RS ,Brasil

关键词: contact angle;    hydrophobicity;    immersion-precipitation;    poly (vinylidene fluoride);    supported membrane;   

DOI  :  10.1590/S1516-14392012005000115

来源: SciELO

【 摘 要 】

The aim of this paper was to prepare a poly (vinylidene fluoride) (PVDF) membrane using different non-solvents in the coagulation bath for the phase inversion method. In order to increase the mechanical strength of membranes, facing the pressure of work, was used a macro-porous polyester support. The morphology and structure of the resulting membranes were evaluated by scanning electron microscopy, porosity measurements, water and 1-octanol uptake, contact angle, pure water flux, hydraulic permeability and hydraulic resistance. The morphology and pure water flux changed significantly using ethanol (symmetric membrane) and/or water (asymmetric membrane) as the non-solvent. The symmetric membrane presented a high hydrophobic surface (water contact angle ~136º) and a higher pure water flux and porosity than the asymmetric membrane, which presented a lower hydrophobicity surface (water contact angle ~90º). The morphologies obtained suggest different applications.

【 授权许可】

CC BY   
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