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首页> 外文期刊>Journal of Applied Polymer Science >Preparation of Polymides Derived from Biphenyltetracarboxylic Dianhydrides and Aromatic Diamines Bearing Alkyene Spacers
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Preparation of Polymides Derived from Biphenyltetracarboxylic Dianhydrides and Aromatic Diamines Bearing Alkyene Spacers

机译：联苯四羧酸二酐和带有芳香族烯间隔基的芳族二胺衍生的聚酰胺的制备

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摘要

Four series of aromatic polyimides (PIs V-VIII) composed of biphenyltet-racarboxylic dianhydrides (BPDAs) and aromatic diamines bearing alkylene spacers were prepared by two methods.Most polymers could be readily prepared in a one-stepmethod for the combination of #alpha#-BPDA wiht #alpha#,#omega#-bis(3-aminophenoxy) alkanes,#alpha#-BPDA with #alpha#,#omega#0bis(4-aminophenoxy)alkanes,and s-BPDA with #alpha#,#omega#-bis(3-aminophenoxy)alkanes.Howerver,the polymerization of s-BPDA with #alpha#,#omega#-bis(4-aminophenoxy)alkanes gave powders.On the other hand,all four monomer combinations afforded the desired polyamic acid solution in a two-step method.These polymer solutions could be cast into tough and flexible films,which were characterized by their inherent viscosity,differential scanning calorimetry,thermogravimetric analysis,and dynamic mechanical spectrometry measurements.The glass transition temperatures (T_gs) of the polymers were in the range of 110-240 deg C,but they were not clearly defined for PIs VIII and VI.The 5% weight loss temperatures were around 450 deg C for all prepared PIs.For PI VIII an "odd-even"behavior of the tensile properties of the films was detected,corresponding to the reported behavior of the melting temperatures.
机译：通过两种方法制备了由联苯撑四羧酸二酐（BPDA）和带有亚烷基间隔基的芳族二胺组成的四系列芳族聚酰亚胺（PI V-VIII），大多数聚合物可以很容易地通过一步法制备＃alpha＃的组合-带有#alpha＃，＃omega＃-双（3-氨基苯氧基）烷烃的BPDA，＃alpha＃-带有＃alpha＃的BPDA，＃omega＃0bis（4-氨基苯氧基）烷烃和带有#alpha＃，＃的s-BPDA ω-双（3-氨基苯氧基）烷烃。然而，s-BPDA与#alpha＃，＃ω-双（4-氨基苯氧基）烷烃聚合得到粉末。另一方面，所有四种单体组合均提供了所需的聚酰胺酸溶液分两步法制备，可将其浇铸成坚韧而有弹性的薄膜，其特征在于其固有粘度，差示扫描量热法，热重分析法和动态机械光谱法测量。玻璃化转变温度（T_gs）的聚合物的温度范围是110-240摄氏度，但不是所有制备的PI的5％失重温度约为450℃。对于PI VIII，检测到薄膜的拉伸性能“奇偶”行为，与报道的行为有关。熔化温度。

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