温度敏感性水凝胶PNIPAm/DMA的制备与研究

采用乳液聚合的方法,以N-异丙基丙烯酰胺（N-isopropylacrylamide,NIPAM）,N,N-二甲基丙烯酰胺（N,N＇-dimethylacrylamide,orDMA）为功能单体,过氧化硫酸胺（Ammonium persulfate,or APS）为引发剂,制备出了含有高亲水性单体含量的温度敏感性的PNIPAM/DMA微水凝胶,通过动态激光光散射仪（DLS）、傅里叶变换红外光谱仪（FTIR）、扫描探针显微镜（AFM）对其结构和性能进行了研究,结果表明,随着DMA含量的增加和温度的升高,微凝胶的粒径逐渐增加;随着DMA含量的增加,最低临界转变温度（LCST）和相转变温度也相应的升高;随着APS用量的增加,凝胶粒径逐渐增加,且当APS的用量为单体浓度的0.03%和0.04%时,反应40min会出现沉淀。

Preparation and Research of Temperature-sensitive Hydrogel PNIPAm/DMA

Using emulsion polymerization for the preparation of high hydrophilic thermosensitive poly（N-isopropylacrylamide/N,N＇-demethylacrylamide）（p（NIPAM/DMA）） Nanogels with N-isopropylacrylamide（NIPAM） and N,N＇-demethylacrylamide（DMA） as functional monomer,with ammonium persulfate（APS） as initiator.By dynamic laser light scattering（DLS）,Fourier transform infrared spectroscopy（FTIR）,Scanning probe microscopy（AFM）,studied polymer＇s structure and properties.The results demonstrated with the DMA concentration increasing and temperature rising,the gels particle size gradually increased,with the DMA concentration increasing,lower critical transition temperature（LCST） and the corresponding phase transition temperature also increased;with the APS concentration increasing,the gel particle size gradually increased,and when the APS concentration went up to 0.03% and 0.04%,response for 40 minutes appeared precipitation.