论文部分内容阅读
应用原子转移自由基聚合,制备了一组窄分布的PS-b-PEO-b-PS三嵌段共聚物.用~1H NMR和TEM表征了它们在选择性溶剂中的胶束化行为.~1H NMR结果表明,共聚物苯环上的质子峰出现在良溶剂(CHCl_3)中,而在选择性溶剂水中消失,证明上述三嵌段共聚物在选择性溶剂水中可逆自组装成以PS为核、PEO为壳的胶束.通过TEM考察了胶束的形状及大小,发现体系胶束尺寸呈多分散、粒径大,对形成的原因也提出了可能的解释.
A series of narrow PS-b-PEO-b-PS triblock copolymers were prepared by atom transfer radical polymerization.Their micelles were characterized by ~ 1H NMR and TEM in a selective solvent. The results of 1H NMR showed that the proton peak on the benzene ring of the copolymer appeared in the good solvent (CHCl 3) and disappeared in the selective solvent water. It was proved that the above triblock copolymer reversibly self-assembled into PS , And the micelles of PEO were shell micelles.The shape and size of the micelles were investigated by TEM, and the size of the micelles was found to be polydisperse and large in size, suggesting possible reasons for their formation.