期刊
COLLOID AND POLYMER SCIENCE
卷 285, 期 4, 页码 471-474出版社
SPRINGER
DOI: 10.1007/s00396-006-1605-5
关键词
microgels; PNIPAM; PDEAAM; temperature sensitive; smart polymer; dynamic light scattering; phase transition
Microgels consisting of poly-N,N-diethylacrylamide (PDEAAM) and copolymer microgels consisting of N,N-diethylacrylamide-co-N-isopropylacrylamide (PDEAAM-co-PNIPAM) have been synthesized via free radical polymerizations. The volume phase transition of the microgels in aqueous solution was investigated by means of dynamic light scattering. All samples revealed a volume phase transition upon heating and the size change was fully reversible. An unusual dependence of transition temperature on the composition of the copolymer microgels was observed and samples were obtained with a transition temperature that was lower than that of both corresponding homopolymer particles. This synergistic behavior could be caused by strong hydrogen bonding between the mono- and the disubstituted acrylamide repeating units at nearly equimolar composition of the microgel.
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