Synthesis and properties of lyotropic liquid crystalline copolyamides containing phthalazinone moiety and ether linkages |
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Authors: | Qizhen Liang Cheng Liu Dingyi Hong |
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Affiliation: | a Department of Polymer Science and Materials, Dalian University of Technology, Dalian 116012, People's Republic of China b Science and Technology Development Division, SINOPEC, Beijing 100029, People's Republic of China c Research Institute of Beijing Yanshan Petrochemical Co, Ltd, Beijing 102500, People's Republic of China |
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Abstract: | A series of aromatic copolyamides containing phthalazinone moiety and ether linkages were prepared from 1,2-dihydro-2-(4-aminophenyl)-4-4-(4-(aminophenoxyl)phenyl)](2H)phthalazin-1-one (DHPZ-DA), p-phenylenediamine (PPD), 4,4′-diaminodiphenylether (DAPE) and terephthaloyl dichloride (TPC) by low temperature solution polycondensation. The copolyamides had relatively high inherent viscosities, ranging from 1.86 to 5.30 dl/g. The copolyamides showed Tg values between 297 and 351 °C. Solubility of these copolyamides was improved in NMP, DMAc, NMP (1 wt% LiCl) and DMAc (1 wt% LiCl) by introducing phthalazinone moiety and ether linkages into the main chain. And they had good thermal stability, associated with 5 and 10% weight loss temperatures in the range of 480-516 and 501-532 °C in nitrogen, respectively. WAXD measures indicated these copolyamides were semicrystalline in nature. Some of these copolyamides exhibited lyotropic liquid crystalline behavior in concentrated H2SO4, NMP (1 wt% LiCl), and even in NMP solutions, as evidenced by polarizing light microscopy. |
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Keywords: | Copolyamides Phthalazinone Lyotropic liquid crystalline |
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