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大四写论文金虫 (正式写手)
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An efficient microwave-assisted synthesis of optically active polyamides in the presence of ionic liquid and conventional solvent: a comparative study Shadpour Mallakpour • Zahra Rafiee Received: 1 May 2010 / Revised: 10 June 2010 / Accepted: 10 June 2010 /Published online: 17 June 2010 Springer-Verlag 2010 Monomer synthesis Optically active dicarboxylic acid monomer 8 was synthesized according to previous publications (Scheme 1) [10, 20]. Polymer synthesis In the present study, several optically active PAs containing L-phenylalanine and anthracenic groups were synthesized based on the phosphorylation polyamidation technique of dicarboxylic acid 8 with various aromatic diamines by two systems of the condensing agent under microwave activation and properties of the resulting polymers were compared (Scheme 1). In the first method IL, [1,3-(pr)2im]Br in the presence of TPP was promoted polyamidation reactions, and microwave irradiation was applied as a source of heating for rapid synthesis of PAs and in the second method NMP/Py/TPP/CaCl2 system was employed as condensing agent under microwave activation. The mechanism of activation by TPP/IL is cited in [19]. The higher inherent viscosities and shorter reaction time were advantages of polymerization using method I than method II. The yields and thermal stability of the polymers were comparative under both conditions and all of the obtained PAs are white color. The results of the polymerization reactions are presented in Tables 1 and 2. |
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jiangguofeng
金虫 (著名写手)
- 翻译EPI: 248
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大四写论文: 金币+35, 翻译EPI+1, ★★★很有帮助 2015-04-08 08:40:19
大四写论文: 金币+35, 翻译EPI+1, ★★★很有帮助 2015-04-08 08:40:19
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在离子液体和常规溶剂存在下，有效的微波辅助合成光学活性的聚酰胺： 比较研究 Shadpour Mallakpour ? Zahra Rafiee 2010五月一日／修订: 2010六月十日／接收: 2010六月十日／网上发表: 2010六月十七日 Springer-Verlag 2010 单体合成 光学活性的二羧酸单体8按照先前的出版物(图1) [ 10, 20]进行合成。 聚合物的合成 在本研究中，基于二羧酸8与各种芳族二胺磷酰化聚酰胺化技术，通过两个冷凝剂系统，在微波活化作用下合成了几种带有L -苯基丙氨酸和蒽基团的光学活性的PA并且对比了形成的聚合物的性质（图1）。 第一个方法IL, 在TPP存在下，促进[ 1,3 - ( pr) 2im] Br聚酰胺化反应,微波照射用作热源，快速合成PA，而在第二个方法中NMP/Py/TPP/CaCl2系统是在微波活化作用下用作冷凝剂。通过TPP/IL的活化作用的机理在[19]中被引证。高特性粘度和较短的反应时间是利用方法I比利用方法II进行聚合更有利的优势。聚合物的收率和热稳定性在两种情况下都是相当的并且获得所有的PA都是白色的。聚合反应的结果列于表1和表2。 |
2楼2015-04-07 12:20:46
