4-乙烯基苄氯/苯乙烯细乳液制备及稳定性研究

Research on preparation and stability of 4-Chloromethyl styrene/ Styrene miniemulsion

摘要:

以4-乙烯基苄氯为模型单体，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影响。结果表明：在乳化剂用量为10mg/mL、超声24min、超声功率400W、助稳定剂用量为单体的5wt%时，制得细乳液的液滴平均粒径约为99nm，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。

Abstract:

In this paper, a series of p-Chloromethyl styrene(p-CMS)/Styrene(St) miniemulsion was prepared with the ultrasonication method. Effect of amount of emulsifier, ultrasonic time, ultrasonic power, and costabilizer content on preparation of miniemulsion and effect of p-CMS/St mass ratios on its stability were investigated. The results show that a miniemulsion with an average diameter as low as 99 nm and a polydispersity index of 0.12 was achieved, under the condition that the concentration of sodium dodecyl sulfate is 10 mg/mL, ultrasonic time is 24min, ultrasonic power is 400W and the mass ratio of hexadecane to monomer is 5%. The stability of the miniemulsion decrease with incerase the mass ratio of p-CMS/St, and Ostwald ripening may be the prime reason for the instability of p-CMS/St miniemulsion. ratio of p-CMS/St, and Ostwald ripening may be the prime reason for the instability of p-CMS/St miniemulsion.