聚苯乙烯“球型刷”式载体的制备研究

Synthesis of a spherical polystyrene brush carrier

以氯乙酰氯为酰基化试剂,通过一步傅克酰基化反应得到氯乙酰化聚苯乙烯(PS-Acyl-Cl)。以聚苯乙烯的氯乙酰基作为原子转移自由基反应(ATRP)的大分子引发基团,以甲苯为溶剂、CuCl/N,N,N′,N′-四甲基乙二胺(TMEDA)为催化剂,接枝制得聚苯乙烯"球形刷"。反应动力学表明其符合典型的ATRP一级反应动力学特征,且反应速率常数k=1.6×10-5/s。通过对催化剂用量、反应温度、反应时间及单体用量控制,得到平均长度在6～33范围内可控的"球形刷"式接枝共聚物。

The initiating groups of ATRP on the surface of cross-linked polystyrene beads is obtained by simple Friedel-Craft reaction when chloroacetylated chlorine is used as acetylated agent. The polystyrene brushes are successfully obtained through grafting on the bead surface when toluene is used as solvent and CuC1/N,N,N＇ ,N＇-tetramethylethylene- diamine as catalyst. The reaction follows the typical first-order kinetics of ATRP reaction with a reaction rate constant of k = 1.6 × 10 -5/s. The average chain length between 6 to 33 of the brush grafting on the bead surface can be controlled by adjusting reaction time, temperature, catalyst amount and monomer concentration.