采用原子转移自由基聚合(ATRP)法合成了嵌段共聚物聚苯乙烯-聚丙烯酸叔丁酯(PSt-PtBuA),在酸性条件下水解得到聚苯乙烯-聚丙烯酸(PSt-PAA),利用核磁共振氢谱(1HNMR)、凝胶渗透色谱(GPC)等对产物进行了表征.PSt-PAA在Tris-HCl缓冲溶液中(pH=7.0)形成临界聚集浓度(CAC)为0.015 g/L的聚集体.PSt-PAA与聚2-甲基丙烯酰氧基乙基三甲基氯化铵(PMADQUAT)可通过静电相互作用形成聚离子复合物(polyion complex,PIC),当m(PMADQuAT)/m(PSt-PAA)=3时,形成的聚离子复合物的CAC为0.005 g/L.动态光散射(DLS)和透射电镜(TEM)结果表明,形成聚离子复合物后,聚集体粒径变小.聚合物形成聚集体可包载二乙二醇单甲醚修饰的C70(MDG-C70)、原卟啉(PPIX)、四苯基锌卟啉(ZnTPP)和四苯基卟啉(TPP)等光敏剂,并增强光敏剂在缓冲溶液中的溶解度.光照条件下,MDG-C70、PPIX、ZnTPP和TPP在聚离子复合物聚集体m(PMADQUAT)/m(pst-PAA)=3的溶液中的单重态氧量子产率分别是在PSt-PAA聚集体溶液中的1.64、2.63、2.60和2.20倍.而在缓冲溶液中,由于光敏剂的聚集作用,未能检测到单重态氧的产生.研究结果表明,聚离子复合物聚集体能够包载光敏剂,是提高单重态氧产率的一个有效途径.
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