Amphiphilic Approach for Preparing Homopolyrotaxanes of Poly(ethylene oxide)
Amphiphilic Approach for Preparing Homopolyrotaxanes of Poly(ethylene oxide)
复制标题
制备聚环氧乙烷均聚轮烷的两亲方法
DOI：
10.1021/ma9712155
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发表时间：
1997
期刊：
影响因子：
5.5
通讯作者：
C. Wilkins
中科院分区：
文献类型：
--
作者：
C. Pugh;J. Bae;Jill R. Scott;C. Wilkins
引入了一种用于制备均聚轮烷的新概念，所述均聚轮烷缺乏用于穿线的螺旋驱动力，并且因此是真正的非相互作用环状分子和线性聚合物链的物理包埋。它是基于两亲物在溶剂中形成层状和柱状胶束的能力，选择性地溶剂化其组分之一。通过在多个钾模板离子存在下在伪高稀释条件下形成大环，制备了平均环尺寸为42个原子连接到疏水的12-碳尾的两亲性大冠醚（MC-12）。MC-12几乎不溶于脂肪烃溶剂，但在水存在下在苯和甲苯中形成胶束。如果加入水溶性线，MC-12的胶束溶液宏观上相分离，但保持完整并溶解水溶性较低的聚（乙二醇）（PEG）衍生物。PEG 3350-双（胺）线程不反应，或反应不完全，与叔丁基。
A new concept was introduced for preparing homopolyrotaxanes that lack an enthalpic driving force for threading, and which are therefore truly a physical entrapment of non-interacting cyclic molecules and linear polymer chains. It is based on the ability of amphiphiles to form lamellae and columnar micelles in solvents that selectively solvate one of its components. An amphiphilic macrocrown ether (MC-12) with an average ring size of 42 atoms attached to a hydrophobic 12-carbon tail was prepared by formation of the macrocycle in the presence of multiple potassium template ions under pseudo-high dilution conditions. MC-12 is almost insoluble in aliphatic hydrocarbon solvents, but forms micelles in benzene and toluene in the presence of water. The micellar solutions of MC-12 macroscopically phase separate if water-soluble threads are added, but remain intact and solubilize less-water-soluble poly(ethylene glycol) (PEG) derivatives. PEG3350−bis(amine) threads do not react, or react incompletely, with tert-bu...