期刊
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
卷 47, 期 5, 页码 524-530出版社
WILEY
DOI: 10.1002/polb.21659
关键词
clay; emulsion polymerization; glass transition; latices; nanocomposites; phase separation; poly(N-isopropylacrylamide)
资金
- National Science Council in Taiwan, Republic of China [NSC 96-2221-E-002-144-MY3]
Exfoliated montmorillonite (MMT)/poly(N-isopropylacrylamide) (PNIPAAm) and MMT/poly(N-isopropylacrylamide-co-acrylamide) [P(NIPAAm-co-AAm)] nanocomposites were fabricated by soap-free emulsion polymerization. Interestingly, as the content of MMT was increased from 0 to 10 wt%, the glass transition temperature of MMT/PNIPAAm was decreased from 145 to 122 degrees C, whereas that of the MMT/P(NIPAAm-co-AAm) increased from 95 to 153 degrees C. Although the lower critical solution temperature (LCST) of 32 degrees C for the MMT/PNIPAAm nanocomposites in aqueous solutions was slightly increased with the content of MMT, that of the MMT/P(NIPAAm-co-AAm) was decreased from 70 to 65 degrees C. A mechanism that the hydrogen bonds between the amide groups of PNIPAAm. were interfered by the exfoliated MMT nano-platelets for the MMT/PNIPAAm nanocomposites and the preferred absorption of acrylamide units to the MMT nanoplatelets rather than N-isopropylacrylamide in the MMT/P(NIPAAm-co-AAm) nanocomposites was suggested to interpret these unusual transition behavior. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 524-530, 2009
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