硫醇末端基聚合物对金纳米粒子配体置换

Ligand Exchange of Gold Nanoparticles with Thiol-terminated Polystyrene

探讨了具有硫醇末端基的聚苯乙烯分子量对配体置换法制备聚合物接枝金纳米粒子的影响.通过可逆加成-断裂链转移(RAFT)聚合反应合成了一系列具有不同分子量的聚苯乙烯(PS),并以正丙胺为还原剂将双硫脂末端基还原成硫醇(—SH).通过用PS-SH配体置换将水相中金纳米粒子(Au NPs)转移至油相中,研究发现,PS分子量越大,进行配体置换得到单分散胶体粒子所需的PS-SH浓度越大.当PS-SH分子量达到59700时,即使增加溶液中PS-SH的浓度,仍无法在油相中得到单分散的稳定胶体粒子.

Effect of molecular weight on the grafting-to method for thiol-terminated polystyrene（PS-SH） on gold nanoparticles was reported.The PSs with different molecular weights were synthesized by reversible addition fragmentation chain transfer（RAFT） polymerization.PS-SH was achieved by the reduction of propylamine.The above PS-SHs were used to transfer gold nanoparticles to tetrahydrofuran（THF） by grafting to method.The PS-SH with higher molecular weight showed poor ligand exchange effect,and higher PS concentration for ligand exchange was needed.When the molecular weight of PS-SH was about 59700,aggregation of gold nanoparticles after ligand exchange can not be avoid.