聚苯乙烯微球的制备及氯乙酰化改性

Preparation and chloroacetylation modification of polystyrene microspheres

通过悬浮聚合法制备交联聚苯乙烯微球(PS)基体,在其表面进行Friedel-Crafts反应,得到氯乙酰化聚苯乙烯微球(PS-Cl)。探究溶剂类型、酰化试剂用量、催化剂用量、反应时间和溶剂用量对PS-Cl担载量及氯乙酰氯转化率的影响。采用红外(FTIR)、扫描电镜(SEM)、粒度分析仪(PSD)对产物进行了表征,并探究产物的热稳定性能。结果表明,聚苯乙烯微球的平均粒径为63.24μm;氯乙酰化聚苯乙烯微球的反应条件在PS、酰化试剂(Reg)和催化剂AlCl_(3)摩尔比1∶1.2∶1.2(以PS微球1.00 g计)、反应时间4 h、溶剂二氯甲烷20 mL下得到PS-Cl微球的最高担载量为4.350 6 mmol/g,氯乙酰氯转化率为57.13%。

The crosslinked polystyrene microspheres(PS) matrix was prepared by suspension polymerization,and chloroacetylated polystyrene microspheres(PS-Cl) were obtained by Friedel-Crafts reaction on the surface.The effects of solvent type,acylation reagent amount,catalyst amount,reaction time and solvent amount on PS-Cl load and chloroacetyl chloride coversion rate were investigated.The products were characterized by FTIR,SEM and PSD,and the thermal stability of the products was investigated.The results showed that the average particle size of polystyrene microspheres were 63.24 μm.The highest loading capacity of PS-Cl microspheres was 4.350 6 mmol/g and the conversion rate of chloroacetyl chloride was 57.13 % under the reaction conditions of PS,acylation reagent(Reg) and catalyst AlCl_(3) molar ratio of 1∶1.2∶1.2(1.00 g of PS microspheres),reaction time of 4 h and solvent dichloromethane of 20 mL.