交联PMMA微球表面PS刷子的合成与表征

The synthesis of PS brush grafting from crosslinked PMMA microsphere by nitroxide-medium controllable free radical polymerization

将含有双键的甲基丙烯酸-2-氨基乙酯化学锚接在交联聚甲基丙烯酸甲酯微球表面,然后用过氧化苯甲酰引发苯乙烯发生氮氧调控自由基原位接枝聚合反应,将聚苯乙烯接枝在交联聚甲基丙烯酸甲酯微球表面,制备了PS刷子层.用凝胶渗透色谱和红外光谱对所合成交联聚苯乙烯接枝聚甲基丙烯酸乙酯共聚物进行了表征,实验结果显示:在2,2,6,6-四甲基哌啶-1-氧自由基存在下,苯乙烯的聚合反应为'活性'自由基聚合,所得到的聚苯乙烯分子量分布在1.13～1.28范围,分子量随聚合时间的延长而增大(7 000～68 000 g/mol).接枝聚合物红外光谱显示聚苯乙烯被接枝到了交联聚甲基丙烯酸甲酯微球表面.AFM 表征显示交联聚甲基丙烯酸甲酯微球尺寸在0.3～1.6 μm 范围.

Here, we reported the preparation of polystyrene by in situ grafting of styrene on a crosslinked poly（methyl methacrylate）microsphere backbone initiating with BPO in the presence of 2,2,6, 6-tetramethyl-l-piperidinoxyl（TEMPO· ）. The experimental results have showed that the grafting polymerization of styrene in situ of crosslinked poly（methyl methacrylate）microsphere surface initiated by BPO in the presence of 2,2,6,6-tetramethyl-l-piperidinoxyl is living free radical polymerization, the synthesized polystyrene have lower polydispersities（ 1.13-1.22）, the molecular weight can be controlled in the range of 7 000 g/mol to 68 000 g/mol. The FTIR result has showed the polystyrene was grafted on the crosslinked poly（ methyl methacrylate） microsphere surface. The diameter of crosslinked poly （ methyl methacrylate） microspheres is in the range of 0.3 to 1.6 μm.