Quantitative determination of threading in rotaxanated polymers by diffusion-ordered NMR spectroscopy

被引：38

作者：

Zhao, TJ

Beckham, HW ^{[1
]}

Gibson, HW

机构：

[1] Georgia Inst Technol, Sch Text & Fiber Engn, Polymer Educ & Res Ctr, Atlanta, GA 30332 USA

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

来源：

MACROMOLECULES | 2003年 / 36卷 / 13期

关键词：

D O I：

10.1021/ma025959g

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Two-dimensional diffusion-ordered NMR spectroscopy (DOSY) was used to examine a rotaxanated polymer and its blends with unthreaded macrocycles. The threaded macrocycles exhibit self-diffusion coefficients similar to those of the polymer, while the diffusion coefficients for the unthreaded macrocycles are much larger. For poly[(styrene)-rotaxa-(30-crown-10)], the method provided definitive proof that the 30-crown-10 is threaded; for blends, the method allowed quantitative determination of the threaded-macrocycle fraction. The DOSY technique is particularly useful for those rotaxanated polymers in which weakly interacting macrocycle and polymer offer no other detectable spectroscopic signature. Threading can be proven, and the fraction of threaded macrocycles can be determined.

引用

页码：4833 / 4837

页数：5

共 50 条

[11] POLYROTAXANES - MOLECULAR COMPOSITES DERIVED BY PHYSICAL LINKAGE OF CYCLIC AND LINEAR SPECIES [J].