Poly(N-isopropylacrylamide) (variously abbreviated PNIPA, PNIPAAm, PNIPAA or PNIPAm) is a temperature-responsive polymer that was first synthesized in the 1950s.[1]
It forms a three-dimensional hydrogel when crosslinked with N,N’-methylene-bis-acrylamide (MBAm) or N,N’-cystamine-bis-acrylamide (CBAm). When heated in water above 33°C, it undergoes a reversible phase transition from a swollen hydrated state to a shrunken dehydrated state, losing about 90% of its mass. Since PNIPAm expels its liquid contents at a temperature near that of the human body, PNIPAm has been investigated by many researchers for possible applications in controlled drug delivery.[2][3]
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不清楚，帮顶
自己做个DSC测吧，不同型号的有差别
聚N-异丙基丙烯酰胺单链附聚体的制备及玻璃化转变行为的研究
2007年全国高分子学术论文报告会（2007.10.9-13 成都）
谢谢大家顶贴
最好自己做一下测试啊，因为不同的聚合度有差异的，在30左右吧，可以用DSC,TG,DMA等测一下
Poly(N-isopropylacrylamide) (variously abbreviated PNIPA, PNIPAAm, PNIPAA or PNIPAm) is a temperature-responsive polymer that was first synthesized in the 1950s.[1]
It forms a three-dimensional hydrogel when crosslinked with N,N’-methylene-bis-acrylamide (MBAm) or N,N’-cystamine-bis-acrylamide (CBAm). When heated in water above 33°C, it undergoes a reversible phase transition from a swollen hydrated state to a shrunken dehydrated state, losing about 90% of its mass. Since PNIPAm expels its liquid contents at a temperature near that of the human body, PNIPAm has been investigated by many researchers for possible applications in controlled drug delivery.[2][3]
呵呵，英文不是很好，是不是说明玻璃化转变温度为33℃啊？从维基百科上找到的，不知道对不对哦^_^
http://en.wikipedia.org/wiki/Poly(N-isopropylacrylamide)
，