蛭石/聚丙烯酰胺复合纳米微球的制备及其性能

Preparation and Performance Evaluation of Polyacrylamide/Vermiculite Nano Core-Shell Microspheres

以白油为连续相、Span80/OP10复配乳化体系为乳化剂、质量分数为40.0%的丙烯酰胺水溶液为分散相,配制了含43%白油、22.4%Span80/OP10(质量比74∶26)复配乳化剂和34.6%丙烯酰胺水溶液的反相微乳液。在反相聚合过程中引入无机核蛭石制备了具有核壳结构的蛭石/聚丙烯酰胺复合微球(PAMCMS),并以产物中复合微球的粒径、溶胀性能及乳液稳定性为指标,考察了引发剂用量、交联剂用量、搅拌速~和反应时间对聚合反应的影响。当引发剂用量为0.09%、交联剂加量为0.025%时,在温度为40℃、搅拌速~为300 r/min的条件下反应8h可获得粒径达680.4 nm的蛭石/聚丙烯酰胺复合微球PAMCMS。激光粒径分析仪和光学显微镜分析结果显示,所制得的PAMCMS的平均粒径为680.4 nm;在40℃恒温水浴的去离子水中溶胀10 h后的粒径达2792 nm,增大了近4倍。

Using white oil as the continuous phase,a blend of surfactants(Span80 and OP10)as emulsifying system and 40.0%aqueous solution of acrylamide as the dispersed phase,the inverse microemulsion was prepared,including 43% white oil,22.4%Span80/OP10(74∶26)emulsifiers and 34.6% aqueous solution of acrylamide. The inorganic vermiculite was added in the polymerization system during the preparation of polyacrylamide inverse emulsion and the composite polyacrylamide microspheres(PAMCMS)with core-shell structure were obtained. Using the size,swelling property and emulsion stability as indicators,the effect of stirring speed,reaction time,and concentration of initiators and crosslinking agent on the polymerization were investigated. When the concentration of initiator and crosslinking agent was 0.09% and 0.025%,respectively,the latex particles with particle diameter of 680.4 nm could be obtained under stirring rate 300 r/min at the temperature of 40℃. The measurement of scanning electronic microscope and Laser particle diameter analyzer showed that the particle diameter of PAMCMS reached up to2792 nm after swelling in deionized water for 10 h,increased by nearly 4 times.