Premium
Preparation and mechanical properties of chemically cross‐linked hydroxypropyl cellulose solid films retaining cholesteric liquid crystalline order
Author(s) -
Suto Shinichi,
Tashiro Hiroshi,
Karasawa Mikio
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.1992.070450908
Subject(s) - materials science , ultimate tensile strength , solubility , hydroxypropyl cellulose , creep , composite material , solvent , liquid crystal , cellulose , chemical engineering , polymer , organic chemistry , chemistry , optoelectronics , engineering
Hydroxypropyl cellulose films were cast from liquid crystalline solutions with a crosslinking agent. The solubility test and the optical measurements of the resultant films were performed. The tensile, dynamic mechanical, and creep properties of the films were determined. The data of solubility in water determined that the cast films are cross‐linked, and the data of circular dichroism spectra, that the cast films retain the cholesteric liquid crystalline order (right‐handed sense). Both findings clarified that the cast films retain the cholesteric order fixed by cross‐linking. The cross‐linking depended on the pairs of the solvent–cross‐linking agent. The mechanical properties also depended on the pairs: the tensile strength and moduli did not always increase with cross‐linking. The creep resistance improved with cross‐linking. The thermally activated Eyring process could be applied and the activated volumes were evaluated for water‐ and methanol‐cast films. There were not clear phenomenological correlations between the mechanical properties of our films.