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미세다공성 폴리프로필렌 중공사막의 다공도 측정
Porosity Measurements of the Microporous Polypropylene Hollow Fiber Membrane
HWAHAK KONGHAK, October 1991, 29(5), 520-525(6), NONE
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Abstract
용융방사와 연신법에 의해 미세다공성 폴리프로필렌 중공사막을 제조하였다. 제조된 중공사막의 다공도를 측정하기 위해 bubble point 측정, 전자현미경에 의한 내ㆍ외벽 촬영, image analyzer, mercury porosimeter를 이용한 미세공의 면적분율 및 부피분율 측정 등을 실시하였다. 중공사막의 bubble point는 30% 에탄올 수용액 속에서 1.5kg/cm2이었다. 미세공은 슬릿모양으로 섬유측에 나란히 배열되어 있고, 일정한 줄무늬를 가지고 막전체에 고르게 분포되어 있었다. 중공사의 내벽과 외벽의 미세공은 비슷한 구조를 가지고 있으며 각각의 면적분율은 30-40%였다. 미세공의 크기별 분포는 정규분포와 비슷한 경향을 띠며, 미세공의 부피분율은 약 52%였다.
Microporous polypropylene hollow fiber membrane was prepared by the melt spinning and cold-stretching method. In order to measure the porosity of the hollow fiber membrane, bubble point measurement and microscopy of the both sides of a hollow fiber were done, and the area fraction and the volume fraction of micropores were estimated through image analyzer and mercury porosimeter. The bubble point of the of micropores were estimated through image analyzer and mercury porosimeter. The bubble point of the hollow fiber measured in 30%(v/v) aqueous ethanol solution was 1.5kg/cm2. Slit-shaped micropores were evenly spread all over the hollow fiber membrane, and parallel to the fiber axis with a stripe pattern. The micropores of the inside and the outside of the hollow fiber membrane have the similar morphology and their area fractions were 30-40%. Pore size distribution was tend to be normal, and the total volume fraction of the micropores was about 52%.
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