Dethreading during the preparation of polyrotaxanes

被引:31
作者
Gong, CG [1 ]
Gibson, HW [1 ]
机构
[1] VIRGINIA POLYTECH INST & STATE UNIV,DEPT CHEM,BLACKSBURG,VA 24060
关键词
D O I
10.1002/macp.1997.021980723
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Using a diol blocking group, bis(p-tert-butylphenyl)bis [p-(2-(2-hydroxyethoxy)ethoxy)phenyl]methane (diol BG 1), a diol with a sterically large core, copoIysebacate 30-crown-10 (30C10) rotaxanes 8, 9 and 10 were synthesized by incorporating different amounts of 1,10-decanediol. These copolymeric rotaxanes were characterized by different techniques, including proton NMR spectra, hydrolytic recovery of 30C10 and 2D NOESY. It was found that threaded 30C10 displayed a range of chemical shifts corresponding to the various sequence structures in which it was constrained. In addition, it was proved that the threading efficiency (min value, the average number of cyclic molecules per repeating unit) increased with feed ratio of diol BG 1 vs. 1,10-decanediol. A linear relationship of threading or dethreading degree vs. the percentage of diol BG in the total diol feed was revealed; more BG, less dethreading. The results demonstrate that dethreading occurs during the polycondensation in the absence of BGs.
引用
收藏
页码:2321 / 2332
页数:12
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