Lortie Frédéric, Boileau Sylvie, Bouteiller Laurent
Laboratoire de Recherche sur les Polymères, UMR 7581, CNRS 2 rue Henri Dunant, B. P. 28, 94320 Thiais, France.
Chemistry. 2003 Jul 7;9(13):3008-14. doi: 10.1002/chem.200304801.
Symmetrical N,N'-disubstituted ureas have been synthesized and characterized. Among them, the branched dialkylureas prepared are highly soluble in organic media. Moreover, the solutions obtained are very viscous in heptane, if the branched alkyl groups are not too bulky (i.e. a methyl group on the alpha carbon, or an ethyl group on the beta carbon). Due to the strong, bifurcated hydrogen bonds between the urea moieties, linear supramolecular polymers are formed. The degree of association of these supramolecular polymers has been determined by FTIR spectroscopy.
已合成并表征了对称的N，N'-二取代脲。其中，所制备的支链二烷基脲在有机介质中高度可溶。此外，如果支链烷基不太庞大（即α碳上的甲基或β碳上的乙基），则在庚烷中获得的溶液非常粘稠。由于脲部分之间存在强的、分叉的氢键，形成了线性超分子聚合物。这些超分子聚合物的缔合度已通过傅里叶变换红外光谱法测定。
