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Characterization of N , N ‐dimethylacrylamide/2‐methoxyethylacrylate copolymers and phase behaviour of their thermotropic aqueous solutions
Author(s) -
ElEjmi Ali A. S.,
Huglin Malcolm B.
Publication year - 1996
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199602)39:2<113::aid-pi476>3.0.co;2-c
Subject(s) - copolymer , thermotropic crystal , lower critical solution temperature , cloud point , aqueous solution , materials science , polymer chemistry , reactivity (psychology) , glass transition , fourier transform infrared spectroscopy , chemical engineering , polymer , chemistry , composite material , liquid crystalline , engineering , medicine , alternative medicine , pathology
Abstract Dimethylacrylamide (DMA) has been copolymerized with 2‐methoxyethylacrylate (MOEA) and solutions of the products were analysed by FTIR to yield derived reactivity ratios r DMA = 1.11 ± 0.13 and r MOEA = 0.63 + 0.10. The measured glass transition temperatures T g of PDMA and PMOEA were 395 K, and 242 K, respectively. These and the values of T g for the copolymers accorded well with the Fox relationship. Cloud point curves for copolymers in water were established over a wide range of concentration, solubility decreasing with increase in temperature. For these reversibly thermotropic solutions, the lower critical solution temperature (LCST) increased from 9°C to 80°C with decrease in content of MOEA in the copolymer from 91.1 mol% to 38.6 mol%.