4-乙烯基苄氯/苯乙烯细乳液制备及其稳定性

Research on the Preparation and Stability of 4-Chloromethyl Styrene/Styrene Miniemulsion

以4-乙烯基苄氯(p-CMS)为模型单体,采用超声细乳化的方法制备了系列p-CMS/苯乙烯(St)细乳液。利用纳米粒度仪研究了乳化剂用量、超声时间、超声功率和助稳定剂等对细乳液制备及p-CMS/St质量比值对细乳液稳定性的影响。结果表明,在乳化剂用量为10 g/L、超声24 min、超声功率400 W、助稳定剂用量为单体质量的5%时,制得细乳液的液滴平均粒径约为99 nm,粒径多分散指数为0.12;细乳液的稳定性随着p-CMS/St质量比值的增大而下降,Ostwald熟化作用可能是p-CMS/St细乳液失稳的主要原因。

A series of p-chloromethyl styrene（ p-CMS）/styrene（ St） miniemulsion was prepared by ultrasonication method. The effect of amount of emulsifier,ultrasonic time,ultrasonic power,and costabilizer content on the preparation of miniemulsion and the effect of p-CMS/St mass ratios on its stability were investigated. The results show that a miniemulsion with an average diameter of as low as99 nm and a polydispersity index of 0. 12 was obtained under the conditions that the concentration of sodium dodecyl sulfate is 10 g/L,ultrasonic time is 24 min,ultrasonic power is 400 W and the mass ratio of hexadecane to monomer is 5%. The stability of the miniemulsion decreases with the mass ratio of p-CMS/St increasing,and Ostwald ripening may be the prime reason for the instability of p-CMS/St miniemulsion.