Thickness transition of a rigid supramolecular polymer

被引:112
作者
Bouteiller, L
Colombani, O
Lortie, F
Terech, P
机构
[1] Univ Paris 06, CNRS, UMR 7610, Lab Chim Polymeres, F-75252 Paris, France
[2] INSA, UMR 5627, Mat Macromol Lab, F-69621 Villeurbanne, France
[3] CEA Grenoble, UMR 5819, Lab PhysicoChim Mol, F-38054 Grenoble, France
关键词
D O I
10.1021/ja0511016
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A low molecular weight bisurea in nonpolar solvents is shown to self-assemble by hydrogen bonding into two distinct high molecular weight structures. At low temperature and high concentration, the most stable structure is a thick cylindrical assembly, responsible for the very high viscosity of the solution. At higher temperature or lower concentration, the thick filaments disappear in favor of thinner filaments, leading to a lower viscosity. The reversible transition occurs over a temperature range of 5 degrees C only, showing that it is highly cooperative. The structural switch can also be triggered by changing the nature of the solvent or the composition in the case of a mixture of two bisureas. The high cooperativity and the tunability of this transition are useful for the design of responsive materials.
引用
收藏
页码:8893 / 8898
页数:6
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