Application of Click Chemistry in the Preparation of Poly(ethylene oxide)-<i>block</i>-poly(ε-caprolactone) with Hydrolyzable Cross-Links in the Micellar Core
作者:Shyam M Garg、Xiao-Bing Xiong、Changhai Lu、Afsaneh Lavasanifar
DOI:10.1021/ma102548m
日期:2011.4.12
develop degradable core-cross-linked polymeric micelles based on poly(ethylene oxide)-block-poly(ε-caprolactone) (PEO-b-PCL) structures using click chemistry. Substituted monomer, that is, α-propargyl carboxylate-ε-caprolactone, was synthesized by anionic activation of ε-caprolactone and further treatment with propargyl chloroformate. Ring-openingpolymerization of α-propargyl carboxylate-ε-caprolactone
本研究的目的是开发基于聚(环氧乙烷)可降解芯交联的聚合物胶束-嵌段-聚(ε -己内酯)(PEO- b使用点击化学-PCL)结构。通过ε-己内酯的阴离子活化并用氯甲酸炔丙酯进一步处理来合成取代的单体,即α-炔丙基羧酸酯-ε-己内酯。以甲氧基PEO(5000 g / mol)为引发剂,辛酸亚锡为催化剂,以α-炔丙基羧酸酯-ε-己内酯的开环聚合反应制备PEO- b-聚(α-炔丙基羧酸酯-ε-己内酯)(PEO) - b-PPCL)嵌段共聚物。发现嵌段共聚物在水溶液中自发缔合形成明确的胶束。在室温下,在铜催化剂存在下,四甘醇(双)叠氮化物试剂的叠氮化物基团与PPCL嵌段上的炔基之间的点击反应使核交联,从而使胶束稳定。1证明了成功的交联1 H NMR,IR光谱和X射线光电子能谱(XPS)。随后通过透射电子显微镜和光散射表征胶束形态和尺寸。牛血清白蛋白(BSA)对交联和非交联胶束的吸附程度表明,交联胶束