论文部分内容阅读
采用原子转移自由基(ATRP)合成了一系列两端为短的聚苯乙烯(PS)嵌段,中间为长的聚乙二醇(PEG)嵌段的PS-b-PEG-b-PS两亲性三嵌段共聚物。采用1H-NMR、荧光探针法和动态光散射研究了PS和PEG嵌段长度对三嵌段共聚物在水中聚集行为的影响。结果表明:三嵌段共聚物在水中可以形成以PS嵌段为核和以PEG嵌段为壳的球形胶束,其胶束化的临界胶束浓度(CMC)随着PS嵌段长度增加而减小,流体力学半径(Rh)随PEG嵌段长度增长而增大,调整PS嵌段长度能有效地调控胶束的形成。胶束对疏水分子芘具有很好的装载能力,芘在胶束中的分配平衡常数(Kv)为105,随PS嵌段长度增加而增大。
A series of PS-b-PEG-b-PS blocks with long polyethylene glycol (PEG) blocks in the middle were synthesized by atom transfer radical (ATRP) Pro-triblock copolymer. The effects of PS and PEG block length on the aggregation behavior of triblock copolymer in water were investigated by 1H-NMR, fluorescence probe and dynamic light scattering. The results showed that the triblock copolymer could form spherical micelles with PS block as core and PEG block as shell in water. The critical micelle concentration (CMC) of micelles increased with the increase of PS block length (Rh) increases with the increase of PEG block length. Adjusting the PS block length can effectively regulate the formation of micelles. Micelles have good loading capacity for hydrophobic molecule pyrene. The equilibrium constant (Kv) of pyrene in micelles is 105, which increases with the increase of PS block length.