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首页> 外文期刊>Journal of Applied Polymer Science >Preparations and Properties of a High Performance Semicrystalline Copolyimide and Composites Reinforced with Glass Fiber
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Preparations and Properties of a High Performance Semicrystalline Copolyimide and Composites Reinforced with Glass Fiber

机译：玻璃纤维增​​强高性能半结晶共聚酰亚胺及复合材料的制备与性能

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摘要

A semicrystalline copolyimide derived from 3,3',4,4'-biphenyltetracarboxylic dianhydride (s-BPDA), 1,3-bis-(4-aminophenoxy) benzene (TPER), and 4,4'-oxydianiline (4,4'-ODA), end capped with phthalic anhydride (PA), was synthesized. Glass fiber reinforced composite was also prepared by impregnating powdery glass fiber with poly(amic acid) followed by solution imidization techniques. This copolyimide displayed a glass transition temperature of 202℃ and a melting temperature of 373℃ by differential scanning colorimeter (DSC). Crystallization and melting behaviors were investigated under nonisothermal and isothermal crystallization conditions. Double exothermic peaks were found by DSC when the copolyimide was cooled from the melt and multiple melting behaviors can be observed after the coployimide had been isothermally crystallized at different temperatures. Mechanical properties were investigated by dynamical mechanical analysis (DMA) and tensile experiments. The samples were cured at different temperatures and then tested at different temperatures. Results indicated that the copolyimide and the composite showed excellent mechanical properties. Additionally, this copolyimide also showed lower melt viscosity by rheological analysis.
机译：由3,3'，4,4'-联苯四甲酸二酐（s-BPDA），1,3-双-（4-氨基苯氧基）苯（TPER）和4,4'-氧二苯胺（4,4）衍生的半结晶共聚酰亚胺合成了用邻苯二甲酸酐（PA）封端的'-ODA）。玻璃纤维增​​强复合材料还可以通过将粉末状玻璃纤维浸入聚（酰胺酸）中，然后进行溶液亚胺化技术来制备。通过差示扫描色度计（DSC），该共聚酰亚胺显示出202℃的玻璃化转变温度和373℃的熔融温度。在非等温和等温结晶条件下研究了结晶和熔融行为。当共聚酰亚胺从熔体中冷却下来时，DSC发现有两个放热峰，并且在不同温度下等聚结晶了多聚酰亚胺后，可以观察到多种熔融行为。通过动态力学分析（DMA）和拉伸实验研究了力学性能。样品在不同温度下固化，然后在不同温度下测试。结果表明，共聚酰亚胺和复合材料显示出优异的机械性能。另外，通过流变学分析，该共聚酰亚胺还显示出较低的熔体粘度。

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