合成温度对PNIPAm水凝胶结构与性能的影响  

Effect of synthetic temperature on structure and properties of poly(N-isopropylacrylamide) gels

作　　者：赖金洪[1] 潘春跃[1] 饶燕平[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2005年第6期1006-1010,共5页Journal of Central South University:Science and Technology

摘　　要：在不同温度下合成了聚N-异丙基丙烯酰胺(PNIPAm)水凝胶,并研究合成温度对凝胶网络结构以及光学和力学性能、溶胀退胀性能、温度敏感性能的影响。研究结果表明,在25℃以下可以合成均相的透明凝胶,在25℃及25℃以上得到多相的混浊凝胶;随着合成温度上升,凝胶透光率、剪切模量、有效交联密度下降,室温溶胀比、溶胀退胀速率增大,而且在25℃存在明显变化。Poly（N-isopropylacrylamide） （PNIPAm） gels were prepared at different temperatures. The effects of synthetic temperature on network structure, optical and mechanical property, swelling and shrinking behavior, thermosensitive behavior were investigated. The results show that PNIPAm gels formed below 25 ℃ are homogeneous, whereas those formed at higher temperatures exhibit heterogeneous structures. With the increase of the synthetic temperature, the transmittance, shear modulus, and effective crosslinking density of PNIPAm gels decrease, while the swelling ratio, rate of swelling and shrinking increase, dramatically at 25 ℃.

关 键 词：聚(N-异丙基丙烯酰胺) 水凝胶 合成温度 溶胀比 体积相转变 

分 类 号：O631[理学—高分子化学]