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1. Effect of pi-pi Stacking on the Self-Assembly of Azomethine Type Rod-Coil Molecules | |||
YU Yingfeng,LIU Yi,ZHONG Xinhui,SU Huihuang,GAN Wenjun | |||
Chemistry 27 December 2010 | |||
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Abstract:The role of pi-pi stacking in the molecular self-assembly behavior, the mesogenic transitions and fluorescent properties was investigated for coil-rod-coil molecules with two ethylene oxide coil units and aromatic azomethine rod units. Three kinds of rod-coil molecules with different rod units were synthesized and characterized by differential scanning calorimetry (DSC), polarized optical microscope (POM), X-ray diffraction (XRD), transmission electronic microscope (TEM), absorption and photoluminescence. With strong pi-pi stacking interaction between coplanar molecules, fibril structure in solution is formed while the fluorescent emission shows a quick increase of the intensity of short wavelength with the increase of solution concentration. Spherical aggregations in solution are formed with the increase of the twisting of the rod segment plane, which decreases the pi-pi stacking interaction and thus enlarges the intermolecular spacing. Simulation work carried out in Material Studio corresponds well with the experiment results of aggregations and mesogenic transitions. | |||
TO cite this article:YU Yingfeng,LIU Yi,ZHONG Xinhui, et al. Effect of pi-pi Stacking on the Self-Assembly of Azomethine Type Rod-Coil Molecules[OL].[27 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4401541 |
2. A New Method for Synthesis of Monodisperse Crosslinked Polystyrene Microspheres | |||
Jiang Kai,Chen Sheng-Li,Dong Peng,Liu Renxiao,Hou Yongxing,Jin Haiyan | |||
Chemistry 28 March 2008 | |||
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Abstract:Crosslinked monodispere polystyrene (CPS) particles were prepared through the normal emulsion polymerization method by adding crosslinker—divinylbenzene (DVB) into reaction system after polystyrene (PS) particles grew to ~80% of their final size. When the amount of crosslinker DVB added was less than 7wt% based on styrene, the prepared CPS particles were spherical and uniform and the size of the CPS particles could be predicted through the normal emulsion method. The glass transition temperature (Tg) of the prepared CPS particles was higher than that of un-crosslinked PS particles and, the more the crosslinker added, the higher the Tg of CPS. The prepared CPS particles had strong resistance to organic solvents. | |||
TO cite this article:Jiang Kai,Chen Sheng-Li,Dong Peng, et al. A New Method for Synthesis of Monodisperse Crosslinked Polystyrene Microspheres[OL].[28 March 2008] http://en.paper.edu.cn/en_releasepaper/content/19859 |
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