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Synthesis and phase separation of poly( N ‐isopropyl acrylamide‐ co ‐methoxy polyethyleneglycol monomethacrylate)
Author(s) -
Kim Youn C.,
Kil DeogSoo,
Kim Jin C.
Publication year - 2006
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.23884
Subject(s) - copolymer , monomer , isopropyl , polymer chemistry , fourier transform infrared spectroscopy , proton , acrylamide , proton nmr , chemistry , ethylene oxide , materials science , polymer , organic chemistry , chemical engineering , physics , quantum mechanics , engineering
The poly( N ‐isopropyl acrylamide‐ co ‐methoxy polyethyleneglycol monomethacrylate, NIPAM‐ co ‐MPEG) with different length of ethylene oxide (EO) were synthesized from their monomers, NIPAM and MPEGs. The numbers of repeating units of EO were 6, 10, 24, and 46. The chemical structure and mole ratio of the monomers was determined by Fourier transform infrared (FTIR), 1 H‐NMR, and 13 C‐NMR spectroscopy. The d ‐spacing increased with the number of EO and the values of the copolymers were in the range of 0.437–0.452 nm. The lower critical solution temperature of the poly(NIPAM‐ co ‐MPEG) shifted to higher temperature as the number of EO and the amount of MPEG increased. The change of chemical shift for methoxy proton in MPEG exhibited a larger than those of the other protons of the poly(NIPAM‐co10−2MPEG). Activation energy ( E a ) for methoxy proton in MPEG showed a larger value than that of the methyl proton in NIPAM. These NMR results indicate the fact that more significant conformational transformations occur in the methoxy group through the phase separation than in the methyl group in NIPAM. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 1833–1841, 2006