摘要
采用溶液聚合法以聚乙烯吡咯烷酮(PVP)为第二网络,以丙烯酸(AA)、4-乙酰基丙烯酰乙酸乙酯(AAEA)为单体制备PVP-P(AAEA-co-AA)半互穿水凝胶(PVP-SIPN),再通过原位还原法合成PVP-P(AAEA-co-AA)/纳米金复合凝胶(GNPs gel),探讨凝胶的溶胀/消溶胀性能、温度及电场敏感性。研究表明,随PVP用量的增加PVP-SIPN溶胀速率减小,平衡溶胀度降低;当PVP用量低于5%凝胶保水率随PVP用量增加而降低,高于5%时保水率随PVP用量增加而增加;PVP-SIPN相转变温度升高,且凝胶温度敏感性随之减弱。纳米金的加入导致凝胶平衡溶胀度从82.3g/g降低至22.66g/g,在电场作用下,外界离子浓度小于0.2mol/L时,GNPs gel发生溶胀;反之,消溶胀,凝胶消溶胀速率随外界电压增大而增大。
A series of PVP-P(AAEA-co-AA)s-IPN(PVP-SIPN)hydrogels were obtained via solution polymerization using PVP as the second network,PVP-P(AAEA-co-AA)/gold nanoparticlescomposite hydrogels(GNPs gel)were synthesis via in situ reduction.The swelling/deswelling properties,temperature sensibility and electric responsive of the hydrogels were studied.The result shows that with the increasing dosage of PVP,the swelling rate,the equilibrium swelling degree diminished;the water-retention rate decreased with the increasing dosage of PVP when the dosage is lower than 5%,however,the water-retention rate rise with the increasing dosage of PVP when the dosage is higher than 5%;the VPTT of the PVP-SIPN hydrogels increased slightly and the temperature sensibility weakened.The addition of gold nanoparticles cut down the equilibrium swelling degree of GNPs gel from 82.3g/g to 22.66g/g.With tha applied voltage,GNPs gel show up a different swelling/deswelling properties,when the dense of ion outside over 0.2mol/L,the hydrogel conducted swelling,on the contrast,it conducted deswelling,and the deswelling ratio of GNPs gel increased with the increasing of the voltage.
出处
《高分子通报》
CAS
CSCD
北大核心
2014年第4期63-70,共8页
Polymer Bulletin
基金
福建省自然科学基金(2012J01423)
福建省教育厅科技项目(JA12414)
关键词
水凝胶
纳米金
温度敏感性
电场响应
Hydrogels
Gold nanoparticles
Temperature sensibility
Electrical sensitivity
