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Mesophases in a Gel from Hydroxypropyl Cellulose/Polyacrylamide
Author(s) -
CastroGuerrero Carlos,
MoralesCepeda Ana,
Kharissova Oxana,
Koschella Andreas,
Heinze Thomas
Publication year - 2010
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200900173
Subject(s) - upper critical solution temperature , hydroxypropyl cellulose , lower critical solution temperature , polyacrylamide , liquid crystal , cellulose , materials science , polymer , chemical engineering , phase (matter) , polymer chemistry , hydroxyethyl cellulose , solvent , organic chemistry , chemistry , composite material , copolymer , optoelectronics , engineering
The objective of the present work is to analyze the different mesophases observed in a gel synthesized from hydroxypropyl cellulose (HPC) and polyacrylamide (PAAm) and its phase behavior in water. Hydroxypropyl cellulose is a material derived from cellulose it is non toxic and degradable. HPC is widely used in pharmaceutics, food additives, stabilizer, thickener, etc., HPC is approved by the FDA for use in the food industry. HPC has the characteristic that it forms liquid crystals, depending on the solvent and on the concentration of the polymer. In this work a lower critical solution temperature (LCST) and an upper critical solution temperature (UCST) were observed, the resulting gel showed anisotropic, nematic and cholesteric phases in water, the phase formed depended on the concentration of the polymer.