摘要
制备了具有温度、pH双重敏感特性的羧甲基纤维素钠/聚(N-异丙基丙烯酰胺)的半互穿网络水凝胶(CM C/PN IPAAm sem i-IPN)。研究了温度、pH对该凝胶溶胀度的影响。结果表明,在酸性(pH=1.0)和弱碱性(pH=7.4)条件下,sem i-IPN凝胶溶胀度均随着温度的升高而下降,但在pH=1.0时,sem i-IPN凝胶的溶胀度小于PN IPAAm凝胶的溶胀度;在pH=7.4时,结果正好相反。20℃时,该凝胶有良好的pH敏感性;而37℃时,敏感性不明显。同时对该凝胶的消溶胀动力学进行了研究,结果发现,该凝胶的消溶胀速率随着凝胶中CM C组分含量的增加而增大。
A new kind of the semi-IPN hydrogels based on linear sodium carboxymethylcellulose （CMC）and cross-linked poly （N-isopropylacrylamide）（PNIPAAm）, which exhibits pH and temperature sensitivities, was synthesized. The swelling behaviors of the semi-IPN hydrogel, which can act as a function of temperature and pH value of the medium, were investigated in detail, respectively. It is found that at acidic condition （pH= 1.0） or weak alkaline condition （pH=7.4）, the swelling ratios of the semi-IPN hydrogel decrease with increasing temperature, the swelling ratio of the semi-IPN hydrogel at pH=1.0 is lower than those of pure PNIPAAm hydrogels, whereas the swelling ratio of the semi-IPN hydrogel at pH=7.4 is higher than those of pure PNIPAAm hydrogels. The influence of pH on the swelling ratios of the semi- IPN hydrogel displays that pH-response of this hydrogel at 20 ℃ is more significant than that of at 37 ℃. In addition, the deswelling rate increases with increasing CMC content in the semi-IPN hydrogel at a temperature over the LCST（45 ℃）.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2005年第5期145-148,共4页
Polymer Materials Science & Engineering
基金
东华大学博士论文创新基金资助(YCX0327)
