文献类型：期刊文献

中文题名：多重响应壳聚糖微凝胶的制备及溶胀性

英文题名：Synthesis and swelling properties of multiresponsive chitosan microgel

作者：刘维俊[1];黄永民[2];彭昌军[2];刘洪来[2]

机构：[1]上海应用技术学院化学与环境工程学院,上海200235;[2]华东理工大学化学系,上海200237

年份：2009

卷号：60

期号：8

起止页码：2101

中文期刊名：化工学报

外文期刊名：CIESC Journal

收录：CSTPCD;;EI(收录号：20093612285359);Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：上海应用技术学院基金重点项目(KJ2008-09)~~

语种：中文

中文关键词：N-异丙基丙烯酰胺;微凝胶;温敏性;pH敏感性

外文关键词：N-isopropylacylamide; microgel; temperature sensitivity; pH sensitivity

摘要：采用无皂乳液聚合法制备聚(N-异丙基丙烯酰胺)/壳聚糖微凝胶(PNIPAM/CS),透射电镜和动态光散射研究了微凝胶外貌形态及刺激响应性。结果显示,微凝胶颗粒呈球形,具有核、壳结构形态。加入壳聚糖对PNIPAM的体积相转变温度(VPTT)有影响,微凝胶VPTT随壳聚糖用量的增加向高温迁移,此结果与示差量热法(DSC)测定一致。不同pH条件下微凝胶粒径变化表明,颗粒直径随pH增大逐渐减小,至碱性又增大,显示明显的pH敏感性;相应颗粒Zeta电位逐渐减小,接近中性达到等电点,至碱性反转为负值,这一变化能对微凝胶pH敏感性进行合理解释。
Poly （N-isopropylacrylamide） /chitosan microgel was synthesized by surfactant-free emulsion polymerization. The morphology and stimuli-responsive properties of the microgel were characterized with transmission electron microscope and dynamic light scattering. The results showed that the microgel particles presented a microsphere with core-shell morphology. The addition of chitosan had a significant effect on the volume phase transition temperature （VPTT） of PNIPAM microgel, and the VPTT shifted to a high temperature with increasing amount of chitosan. This result was consistent with measurements of differential scanning calorimeter. The diameter changes of the microgels at various pH solutions indicated that the size decreased gradually with increasing pH, and then increased after pH〉7, implying obvious pH sensitivity of the particles. The relevant Zeta potential of the particles also decreased gradually, and changed to a negative value. This transition can explain reasonably the pH sensitivity of the microgel.