Premium
Studies on the glass transition of blends of nylon‐6 and polyacrylic acid
Author(s) -
Jin Y.,
Huang R. Y. M.
Publication year - 1988
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.1988.070360807
Subject(s) - miscibility , differential scanning calorimetry , polyacrylic acid , glass transition , thermogravimetric analysis , materials science , scanning electron microscope , polymer chemistry , polymer , acetic acid , chemical engineering , pervaporation , polymer blend , membrane , composite material , chemistry , organic chemistry , copolymer , permeation , biochemistry , physics , engineering , thermodynamics
The glass transition temperatures ( T g ) of blends of polyacrylic acid (PAA)–Nylon 6 in various proportions used as membrane material in pervaporation separation of acetic acid–water and ethanol–water mixtures were determined using differential scanning calorimetry (DSC). All the samples examined showed a single T g which lay between the T g of Nylon 6 and PAA, indicating that complete miscibility was achieved in these polymer blends. Further evidence of complete miscibility was obtained by scanning electron microscopy (SEM) of cross sections of the blended films which showed a uniform structure. An interesting phenomenon was observed during the DSC measurements which showed a shift in T g of the blended samples with scanning time. Infrared and thermogravimetric measurements were conducted to further investigate this phenomenon and the results were explained as the change in T g being caused by the elimination of water molecules and the formation of anhydrides in the polyacrylic acid portion of the polymer blends.