Aromatic polyamides and polyimides with benzimidazole or benzoxazinone pendent groups prepared from 5-(2-benzimidazole)- or 5-(2-benzoxazinone)-1,3-phenylenediamine
Aromatic polyamides and polyimides with benzimidazole or benzoxazinone pendent groups prepared from 5-(2-benzimidazole)- or 5-(2-benzoxazinone)-1,3-phenylenediamine
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DOI：
10.1016/0032-3861(96)87633-6
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发表时间：
1996-06
期刊：
影响因子：
4.6
通讯作者：
J. Mikroyannidis
中科院分区：
文献类型：
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作者：
J. Mikroyannidis
含有苯并咪唑或苯并恶嗪酮侧基的新型芳香族聚酰胺和聚酰亚胺由5-(2-苯并咪唑)-或5-(2-苯并恶嗪酮)-1,3-苯二胺制备。通过特性粘度和吸水率测量、傅里叶变换红外、1H核磁共振、X射线、热机械、热重和等温重分析对它们进行了表征。将它们的性能与衍生自 1,3-苯二胺的母体聚合物的性能进行了比较。改性聚合物比未改性的聚合物表现出更好的溶解度，并且溶解在极性非质子溶剂和某些无机和有机酸中。带有苯并咪唑或苯并恶嗪酮侧基的聚酰胺分别表现出比参考聚酰胺更高或更低的亲水性。所有改性聚合物都是无定形的，并且比相应的未改性聚合物表现出更低的玻璃化转变温度和热稳定性。其中一些在 133–205°C 范围内软化。
New aromatic polyamides and polyimides containing benzimidazole or benzoxazinone pendent groups were prepared from 5-(2-benzimidazole)- or 5-(2-benzoxazinone)-1,3-phenylenediamine. They were characterized by inherent viscosity and water absorption measurements, Fourier transform infra-red,1H nuclear magnetic resonance, X-ray, thermomechanical, thermogravimetric and isothermal gravimetric analyses. Their properties were compared with those of the parent polymers derived from 1,3-phenylenediamine. The modified polymers displayed better solubility than the unmodified ones and dissolved in polar aprotic solvents and certain inorganic and organic acids. The polyamides bearing benzimidazole or benzoxazinone pendent groups exhibited higher or lower, respectively, hydrophilicity than the reference polyamide. All modified polymers were amorphous and showed lower glass transition temperatures and thermal stability than the corresponding unmodified ones. Some of them softened in the region of 133–205°C.