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Gas transport phenomena in hydroxypropyl cellulose solid film retaining cholesteric liquid crystalline order
Author(s) -
Suto Shinichi,
Kobayashi Tetsuya
Publication year - 1998
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/(sici)1097-4628(19981121)70:8<1465::aid-app5>3.0.co;2-2
Subject(s) - hydroxypropyl cellulose , amorphous solid , chemical engineering , liquid crystal , materials science , cellulose , polymer , semipermeable membrane , polymer chemistry , organic chemistry , chemistry , membrane , composite material , biochemistry , optoelectronics , engineering
Two kinds of hydroxypropyl cellulose (HPC) films were prepared: one retained cholesteric liquid crystalline order (HPC‐A), and another was amorphous (HPC‐B). Gas transport phenomena in the HPC‐A films were determined at 20°C, which is below the T g of HPC, compared with those in the HPC‐B films, by using mainly oxygen and nitrogen gases; herium and carbon dioxide gases were also used. The permeability coefficient P for the HPC‐A films was smaller than that for the HPC‐B films by approximately 10 times. The gas permselectivity, defined as the ratio of P for each gas, was affected by the liquid crystalline order, as follows: The permselectivity for the HPC‐A films was greater than that of the HPC‐B films. The trends of gas permeability and permselectivity for the liquid crystal‐forming HPC films were the same as those reported for other liquid crystal‐forming cellulosic films. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 70: 1465–1470, 1998