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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received May 10, 2015
Accepted June 9, 2015

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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상분리 조절에 의한 PVDF막의 구조 변화

Structural Changes of PVDF Membranes by Phase Separation Control

이세민 김성수^†

Semin Lee Sung Soo Kim^†

경희대학교 화학공학과, 지역혁신센터, 17104 경기도 용인시 기흥구 서천동 1

Department of Chemical Engineering, Regional Innovation Center, Kyung Hee University, 1, Seocheon-dong, Yongin, Gyeonggi, 17104, Korea

sungkim@khu.ac.kr

Korean Chemical Engineering Research, February 2016, 54(1), 57-63(7), 10.9713/kcer.2016.54.1.57 Epub 12 February 2016

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Abstract

Polyvinylidene fluoride (PVDF) 평막 제조를 위하여 PVDF의 용매와 희석제로서 n-methyl-2-pyrrolidone (NMP)와 dibutyl-phthlate (DBP)를 각각 사용하여 열유도 상분리(thermally induced phase separation, TIPS)와 비용매유도 상분리(nonsolvent induced phase separation, NIPS)를 동시에 유도하였다. NMP와 DBP를 PVDF와 용융 혼합할 경우 TIPS 공정에서의 결정화 온도가 낮아졌고 NIPS 공정에서의 불안정 영역이 확대되었다. 용매와 희석제의 비율에 따라 상분리 메카니즘이 변화하였고 이에 따라 다양한 구조의 막이 형성됨을 확인하였다. 또한 dope 용액과 비용매의 접촉여부에 따라 지배적인 상분리 거동이 결정되었다. 열전달이 물질전달에 비하여 빠르게 이루어지므로 막의 표면은 NIPS에 의하여 지배를 받고 막의 내부는 TIPS에 의한 구조가 형성되었다. 또한 dope 용액의 급냉온도에 따라 상분리 메카니즘 및 상 분리 속도가 변화하여 다양한 구조를 형성하였다.

Thermally induced phase separation (TIPS) and nonsolvent induced phase separation (NIPS) were simultaneously induced for the preparation of flat PVDF membranes. N-methyl-2-pyrrolidone (NMP) was used as a solvent and dibutyl-phthlate (DBP) was used as a diluent for PVDF. When PVDF was melt blended with NMP and DBP, crystallization temperature was lowered for TIPS and unstable region was expanded for NIPS. Ratio of solvent to diluent changed the phase separation mechanism to obtain the various membrane structures. Contact mode of dope solution with nonsolvent determined the dominant phase separation behavior. Since heat transfer rate was greater than mass transfer rate, surface structure was formed by NIPS and inner structure was by TIPS. Quenching temperature of dope solution also affected the phase separation mechanism and phase separation rate to result in the variation of structure.

Keywords

PVDF Membranes Membrane Preparation Thermally Induced Phase Separation (TIPS) Nonsolvent-Induced Phase Separation (NIPS) Crystallization Unstable Region

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