Mechanically Interlocked Structure of Polyrotaxane Investigated by Contrast Variation Small-Angle Neutron Scattering

被引：22
|
作者：
Mayumi, Koichi [1 ]
Endo, Hitoshi [2 ]
Osaka, Noboru [2 ]
Yokoyama, Hideaki [1 ]
Nagao, Michihiro [3 ,4 ]
Shibayama, Mitsuhiro [2 ]
Ito, Kohzo [1 ]
机构：
[1] Univ Tokyo, Grad Sch Frontier Sci, Chiba 2778561, Japan
[2] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan
[3] Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA
[4] Indiana Univ, Cyclotron Facil, Bloomington, IN 47408 USA
来源：
MACROMOLECULES | 2009年 / 42卷 / 16期
关键词：
CYCLODEXTRIN; POLYMER; SANS;
D O I：
10.1021/ma9010318
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 detailed structure of polyrotaxane (PR) in solution by using contrast variation small-angle neutron scattering (SANS) was investigated. The scattering function of PR was decomposed into partial scattering functions of polyethylene glycol (PEG) and α-cyclodextrins (CD) and the conformation of PEG in PR and the spatial distribution of CDs on PEG was determined. The results show that the scattering curves of d-PR are convex downward, while those of h-PR are convex upward. It is also found that the volume fraction of CD in a PR is 2.4 times as larger as that of PEG. The cross-term for PR is positive and has a magnitude between the magnitudes of the self-terms. The findings obtained by SANS with contrast variation are found to be the first evidence of CDs in PR dispersed randomly along the chain in solution.
引用
收藏
页码：6327 / 6329
页数：3
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