Characterization ofN,N-Dimethylacrylamide/2-Methoxy-ethylacrylate Copolymers and PhaseBehaviour of their Thermotropic Aqueous Solutions
✍ Scribed by El-Ejmi, Ali A. S.; Huglin, Malcolm B.
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 410 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0959-8103
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✦ Synopsis
Dimethylacrylamide (DMA) has been copolymerized with 2methoxyethylacrylate (MOEA) and solutions of the products were analysed by FTIR to yield derived reactivity ratios rDMA = 1.11 0.13 and rMOEA = 0.63 f 0.10. The measured glass transition temperatures T, of PDMA and PMOEA were 395 K and 242 K, respectively. These and the values of T, 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%.