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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and properties of aromatic polyamide homologs containing chlorine substituents
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Preparation and properties of aromatic polyamide homologs containing chlorine substituents

机译：含氯取代基的芳族聚酰胺同系物的制备与性能

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In order to study systematically the effect of halogen substituents on both the solubility and the thermal stability of aromatic polyamides, new diamine monomers have been synthesized by introducing chlorine groups onto various positions of 4,4'-diaminobenzanilide for the preparation of chlorinated aromatic polyamides. The monochlorinated aromatic polyamides, i.e., P-LCl and P-RCl, exhibited liquid crystalline property in 100% sulfuric acid solution in the temperature range from 40 and 60 degrees C. However, the dichlorinated sample, i.e. P-LRCl, did not exhibit the liquid crystalline property due to the bulkiness of two chlorine groups. Both P-LCl and P-RCl exhibited unimodal decomposition behavior in contrast to the chlorinated poly(p-phenylene terephthalamide) (PPTA) that has been known to show bimodal decomposition behavior. The decomposition onset temperature of both P-LCl and P-RCl was 567 degrees C, which was higher than 549 degrees C of unchlorinated polyamide, P-NCl, but the same as that of PPTA. The char yield was about 50% for both P-LCl and P-RCl and higher than 40% of both PPTA and P-NCl. In the case of P-LRCl, the decomposition onset temperature was 480 degrees C, but the highest char yield of 60% was obtained. (C) 2000 John Wiley & Sons, Inc. [References: 28]
机译：为了系统地研究卤素取代基对芳族聚酰胺的溶解度和热稳定性的影响，通过将氯基团引入4,4'-二氨基苯甲酰苯胺的各个位置上来合成新的二胺单体，以制备氯化芳族聚酰胺。单氯化芳族聚酰胺，即P-LCl和P-RCl，在40至60摄氏度的温度范围内，在100％硫酸溶液中表现出液晶性能。但是，二氯化样品（即P-LRCl）没有表现出由于两个氯基团的体积大，所以具有液晶性质。与已知显示双峰分解行为的氯化聚对苯二甲酰对苯二酰胺（PPTA）相比，P-LCl和P-RCl均表现出单峰分解行为。 P-LCl和P-RCl的分解起始温度均为567℃，高于未氯化聚酰胺P-NCl的549℃，但与PPTA相同。对于P-LCl和P-RCl而言，焦炭产率均为约50％，而对PPTA和P-NCl而言均超过40％。在P-LRCl的情况下，分解起始温度为480℃，但是获得了60％的最高炭产率。 （C）2000 John Wiley＆Sons，Inc. [参考：28]

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