Supramolecular Pseudorotaxane Graft Copolymer from a Crown Ether Polyester and a Complementary Paraquat-Terminated Polystyrene Guest

被引：65

作者：

Lee, Minjae ^{[1
]}

Moore, Robert B. ^{[1
]}

Gibson, Harry W. ^{[1
]}

机构：

[1] Virginia Polytech Inst & State Univ, Dept Chem, Blacksburg, VA 24061 USA

来源：

MACROMOLECULES | 2011年 / 44卷 / 15期

基金：

美国国家科学基金会;

关键词：

MACROCYCLIC POLYMERS; POLYROTAXANES; ROTAXANE)S; HOST; POLYURETHANE; COMPLEXATION; MOLECULES; CHEMISTRY; BLOCK; STAR;

D O I：

10.1021/ma201241t

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The self-assembly of a polyester containing crown ether host repeat units and a paraquat-terminated polystyrene guest provides a supramolecular pseudorotaxane graft copolymer based on the bis(m-phenylene)-32-crown-10/ paraquat recognition motif. NMR chemical shift changes in solution gave evidence of the complexation of the crown ether and paraquat moieties. Solutions of the two polymers at 1:1 host:guest stoichiometry (crown ether:paraquat), but only 3 mass % crown polymer, possessed an intrinsic viscosity 1.9 times that of the paraquat-terminated polystyrene and 2.7 times that of the polyester. Differential scanning calorimetry revealed only one glass transition for a solid from evaporation of a solution at 3:1 host:guest (crown ether:paraquat) stoichiometry; this indicated complete phase mixing, as confirmed by optical microscopy and small-angle laser light scattering.

引用

页码：5987 / 5993

页数：7

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