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选用Ca2+交联的海藻酸钠(SA)为壳,以N,N-亚甲基双丙烯酰胺(BIS)交联合成的聚N-异丙基丙烯酰胺(PNIPAM)微凝胶为核,采用预凝胶法合成PNIPAM/SA-核/壳结构微凝胶。结果表明:当表面活性剂(SDS)用量为1%(摩尔百分数,下同),交联剂用量为2.5%时,得到稳定粒径大小的PNIPAM微凝胶。在PNIPAM/SA-核/壳结构微凝胶的合成过程中,不同的核/壳用量也影响最终的粒径大小。研究发现,当PNIPAM用量为20mL,SA用量为0.1g时,可以得到较小粒径的核/壳结构微凝胶。微凝胶的性质通过激光粒度分析仪(DLS)和透射电子显微镜(TEM)进行表征。
The sodium alginate (SA) crosslinked by Ca2 + was used as the shell and the poly-N-isopropylacrylamide (PNIPAM) microgel as crosslinked by N, N-methylenebisacrylamide (BIS) PREPARATION SYNTHESIS OF PNIPAM / SA-CORE / SHELL STRUCTURE MICROGELS. The results showed that PNIPAM microgels with stable particle size were obtained when the amount of surfactant (SDS) was 1% (molar percentage) and the amount of cross-linking agent was 2.5%. In the PNIPAM / SA-core / shell structure microgels synthesis, the different core / shell dosage also affects the final particle size. The study found that when the PNIPAM dosage of 20mL, SA dosage of 0.1g, you can get a smaller particle size of the core / shell structure of the microgel. The properties of microgels were characterized by laser particle size analyzer (DLS) and transmission electron microscopy (TEM).