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首页> 外文期刊>Journal of Applied Polymer Science >Semicrystalline polyimide matrices for composites: Crystallization and properties
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Semicrystalline polyimide matrices for composites: Crystallization and properties

机译：复合材料的半结晶聚酰亚胺基体：结晶和性能

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New semicrystalline polyimide/oligoimide blends, designated for matrices in carbon fiber-reinforced composites, were developed. A specific advantage of the proposed polyimides is their ability to crystallize from the melt, therein retaining their crystallinity throughout the manufacturing process. The generation of crystallinity after melting, referred to as recrystallization, was investigated here as affected by blending the polyimides with oligoimides of a similar chemical structure. Based on thermal analysis and enthalpy measurements, comparative X-ray diffraction analyses, and polarized light microscopy of hot-stage-controlled crystallization, the recrystallization ability was determined for five different oligoimides. In some cases, the addition of oligoimides, both amorphous and crystalline, resulted in complete recrystallization. The main contribution of the oligoimides is suggested to be through plasticization, allowing segmental chain mobility during crystallization, and not via nucleation. A similar effect was obtained by lowering the molecular weight of the polyimide; this, however, generates mechanical property reduction, rendering the polyimide irrelevant to composite materials. Finally, it was shown that crystallization was also enhanced by carbon fibers, serving as a nucleating agent and generating transcrystallization. (C) 2002 John Wiley Sons, Inc. [References: 20]
机译：开发了新的半结晶聚酰亚胺/低聚酰亚胺混合物，这些混合物被指定用于碳纤维增强复合材料中的基质。所提出的聚酰亚胺的一个特定优点是它们从熔体中结晶的能力，在整个制造过程中保持其结晶性。在此研究了熔融后结晶度的产生，称为重结晶，这是通过将聚酰亚胺与具有相似化学结构的低聚酰亚胺共混而影响的。基于热分析和焓测量，对比X射线衍射分析以及热阶段控制结晶的偏光显微镜，确定了五种不同的低聚酰亚胺的重结晶能力。在某些情况下，添加无定形和结晶的低聚酰亚胺会导致完全重结晶。据认为，低聚酰亚胺的主要作用是通过增塑，从而在结晶过程中允许链段移动，而不是通过成核作用。降低聚酰亚胺的分子量可获得相似的效果。但是，这会导致机械性能降低，从而使聚酰亚胺与复合材料无关。最后，显示出碳纤维还促进了结晶，碳纤维用作成核剂并产生转结晶。 （C）2002 John Wiley Sons，Inc. [参考：20]

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