论文部分内容阅读
以末端带胺基的聚苯乙烯(PS-NH2)为引发剂,利用N-羧酸内酸酐(N-carbonyl anhydride,NCA)法制备一种刚柔二嵌段共聚物聚苯乙烯-b-聚(γ-苄基-L-谷氨酸酯)(polystyrene-b-poly(γ-benzyl-L-glutamate),PS-b-PBLG)杂化聚肽,并研究该聚肽嵌段共聚物的分子结构、热性能、液晶性与自组装形貌的溶剂效应.以氢核磁共振波谱(1H-NMR)和凝胶渗透色谱仪(GPC)表征两嵌段的摩尔比、分子量及其分布.利用示差扫描量热分析仪(DSC)与光学显微镜(POM)考察材料的热性质与液晶性.由小角X射线散射(SAXS)分析得知,两嵌段组分呈交替分布层状结构,聚肽层中α螺旋链在不同溶剂中会发生不同程度折叠;通过透射扫描电镜(TEM)清楚观察到PS-b-PBLG在1,2-二氯乙烷(EDC)中α螺旋折叠形成了条纹式层状形貌,不同于1,1,2,2-四氯乙烷(TCE)中α螺旋完全伸展形成的锯齿式层状形貌.
A novel rigid-flexible diblock copolymer, polystyrene-b-polybutadiene, was prepared by using N-carbonyl anhydride (NCA) Polystyrene-b-poly (γ-benzyl-L-glutamate), PS-b-PBLG) The molecular structure, thermal properties, liquid crystallinity and solvent effect of self-assembly topography were characterized by 1HNMR and GPC. The molar ratio, molecular weight and their distribution of diblock were characterized. The thermal and liquid crystalline properties of the materials were investigated by differential scanning calorimetry (DSC) and optical microscopy (POM) .Analysis by SAXS showed that the diblocks were distributed in alternating layers and poly The α helices in the peptide layer were folded to different extents in different solvents. It was clearly observed by transmission electron microscopy (TEM) that α-helices of PS-b-PBLG in 1,2-dichloroethane (EDC) Layered morphology, different from 1,1,2,2-tetrachloroethane (TCE) α-helical complete extension of the serrated lamellar morphology.