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大四写论文

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Aromatic polyamides (PAs) are well-known thermally stable polymers with good chemical resistance and thermal stability, low flammability, and very good mechanical properties [13]. However, their limited solubility in most organic solvents and high melting and glass transition temperatures reduce their processability and restrict further applications. Numerous efforts have been made to improve the solubility and processability of aromatic PAs with retention of their high thermal stability. The incorporation of flexible chains into PA backbone, the use of meta-oriented monomers, synthesis of PAs with noncoplanar groups in the polymer chains, introduction of bulky side moieties into the polymer chains resulted in a number of structural modifications of the polymer backbone [14–18].
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大四写论文: 金币+30, 翻译EPI+1, ★★★很有帮助 2015-04-06 13:45:22
芳族聚酰胺(PA)是众所周知的热稳定的聚合物,具有良好的化学耐性、热稳定性、不易燃性以及极好的机械性能[ 13]。然而,它们在大部分有机溶剂中的有限溶解度和高熔点、高玻璃态转化温度使它们的加工性能降低并限制了更多的应用。 已经做出很多努力在保持它们高度热稳定性的情况下去改善芳族PA的可溶性和加工性能。向PA骨架当中掺入柔性链,使用间位取向单体,合成在聚合物链中带有非共面基团的PA,把大侧面一部分引入经聚合物骨架作出许多结构修改后生成的聚合物链中 [14–18]。
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