Premium
Structure of microporous polypropylene sheets containing CaCO 3 filler
Author(s) -
Nagō Satoshi,
Nakamura Shunichi,
Mizutani Yukio
Publication year - 1992
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1992.070450904
Subject(s) - polypropylene , materials science , microporous material , filler (materials) , particle size , composite material , porosity , microstructure , particle (ecology) , tortuosity , chemical engineering , oceanography , engineering , geology
The microporous polypropylene sheets were prepared by biaxially stretching polypropylene sheets containing CaCO 3 filler (particle size, 0.08–3.0 μm), when the CaCO 3 filler content was 59% by weight and the stretching ratio was 2.8 × 1.8. The microstructure of the sheets were investigated in relation to the CaCO 3 particle size by a N 2 gas permeation method. (1) Effective porosity increases with decreasing mean particle size of filler. (2) The tortuosity factor of the pore is in the range of 25–40 and becomes relatively smaller with decreasing mean particle size of filler. (3) The equivalent pore size becomes relatively smaller with decreasing mean particle size of filler.