【作者】 旷桂超； 滕明俊； 贾欣茹； 许静； 陈尔强；

【Author】 Kuang Gui-chao,Teng Ming-jun,JiaXin-ru~*,XuJing,Chen Er-qiang Beijing National Laboratory for Molecular Sciences,and Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871

【机构】 北京分子科学国家实验室,北京大学化学与分子工程学院高分子教育部重点实验室； 北京大学化学学院高分子系；

【摘要】 <正>凝胶的形成是分子溶解、结晶、凝胶的竞争过程。凝胶的形成受动力学控制,但并非热力学稳定状态。目前的研究表明,通过过饱和,加入添加剂、延长成核时间等可以实现从凝胶到结晶的转化。但如何调控外部条件以控制形成凝胶或结晶仍然一个具有挑战性的课题。一般来说,在合适的溶剂中,当成核位垒低时,结晶速度较快,凝胶容易转变为结晶。改变溶剂,组装体系形貌可能因为凝胶和结晶之间的转变而发生很大的改变。更多还原

【Abstract】 The amino acids-based dendrons Nap-G1 and Nap-G2 with focal naphthyl group were synthesized and their self-assembly properties in organic solvents were studied.Nap-G1 developed fibrous networks withβ-sheet architecture in cyclohexane but exhibited spherulitic networks in mixed solvents(chloroform/petroleum ether 1:5,v/v).In contrast,Nap-G2 acted as an efficient organogelator in chloroform but exhibited perfect crystalline fibers in relatively high polarity solvents,such as acetone and methanol.The polymorphic structures found in this study will afford a way to investigate the kinetic and thermodynamic aspects of self-assembly of dendritic molecules.更多还原