Formation mechanism of macrovoids in PMMA membranes

碩士 === 中原大學 === 化學工程學系 === 87 === In this work, the formation of macrovoids in two membrane formation systems was investigated. The polymer and the coagulant used in these two systems were the same: PMMA and water, but the solvents used to dissolve PMMA were different: NMP for one system...

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Main Authors: Tian-Tsair Wu, 吳添財
Other Authors: Juin-Yih Lai
Format: Others
Language:zh-TW
Published: 1999
Online Access:http://ndltd.ncl.edu.tw/handle/88212775569671259602
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spelling ndltd-TW-087CYCU00630022016-02-03T04:32:23Z http://ndltd.ncl.edu.tw/handle/88212775569671259602 Formation mechanism of macrovoids in PMMA membranes PMMA薄膜之巨形孔洞形成機制 Tian-Tsair Wu 吳添財 碩士 中原大學 化學工程學系 87 In this work, the formation of macrovoids in two membrane formation systems was investigated. The polymer and the coagulant used in these two systems were the same: PMMA and water, but the solvents used to dissolve PMMA were different: NMP for one system and acetone+ 18 vol% Tween 80 solution for the other. According to SEM and AFM analyses, it was found that, although the macrostructures of the membranes fabricated by systems PMMA/NMP and PMMA/acetone+ 18 vol% Tween-80 are similar, the microstructures are different. On basis of the optical observation of the growth of macrovoids, it is proposed that the difference in the microstructure can be explained by the difference in the growth mechanism of macrovoids: the growth of macrovoids is by convection for system PMMA/NMP/water and by diffusion for PMMA/acetone+ 18 vol% Tween-80/water. The difference in the growth mechanism of macrovoids can also account for some other differences between systems PMMA/NMP/water and PMMA/acetone+ 18 vol% Tween-80/water: is more sensitive to the casting thickness than PMMA/NMP/water, and the addition of salt in the coagulation bath can effectively inhibit the growth of macrovoids in PMMA/acetone+ 18 vol% Tween-80/water but not in PMMA/NMP/water. Juin-Yih Lai 賴君義 1999 學位論文 ; thesis 73 zh-TW
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language zh-TW
format Others
sources NDLTD
description 碩士 === 中原大學 === 化學工程學系 === 87 === In this work, the formation of macrovoids in two membrane formation systems was investigated. The polymer and the coagulant used in these two systems were the same: PMMA and water, but the solvents used to dissolve PMMA were different: NMP for one system and acetone+ 18 vol% Tween 80 solution for the other. According to SEM and AFM analyses, it was found that, although the macrostructures of the membranes fabricated by systems PMMA/NMP and PMMA/acetone+ 18 vol% Tween-80 are similar, the microstructures are different. On basis of the optical observation of the growth of macrovoids, it is proposed that the difference in the microstructure can be explained by the difference in the growth mechanism of macrovoids: the growth of macrovoids is by convection for system PMMA/NMP/water and by diffusion for PMMA/acetone+ 18 vol% Tween-80/water. The difference in the growth mechanism of macrovoids can also account for some other differences between systems PMMA/NMP/water and PMMA/acetone+ 18 vol% Tween-80/water: is more sensitive to the casting thickness than PMMA/NMP/water, and the addition of salt in the coagulation bath can effectively inhibit the growth of macrovoids in PMMA/acetone+ 18 vol% Tween-80/water but not in PMMA/NMP/water.
author2 Juin-Yih Lai
author_facet Juin-Yih Lai
Tian-Tsair Wu
吳添財
author Tian-Tsair Wu
吳添財
spellingShingle Tian-Tsair Wu
吳添財
Formation mechanism of macrovoids in PMMA membranes
author_sort Tian-Tsair Wu
title Formation mechanism of macrovoids in PMMA membranes
title_short Formation mechanism of macrovoids in PMMA membranes
title_full Formation mechanism of macrovoids in PMMA membranes
title_fullStr Formation mechanism of macrovoids in PMMA membranes
title_full_unstemmed Formation mechanism of macrovoids in PMMA membranes
title_sort formation mechanism of macrovoids in pmma membranes
publishDate 1999
url http://ndltd.ncl.edu.tw/handle/88212775569671259602
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