酚酞基聚芳醚酮增韧改性环氧树脂的结构与性能
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西安航天复合材料研究所 陕西省航天复合材料重点实验室,陕西 西安 710025

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Structure and Properties of Phenolphthalein-Based Polyaryl Ether Ketone Toughened Modified Epoxy Resin
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    摘要:

    针对耐高温环氧树脂韧性低的问题,本文采用酚酞基聚芳醚酮(PEK-C)增韧改性耐高温环氧树脂。研究了PEK-C相对分子质量和含量对改性树脂的固化反应、增韧效果和耐热性能的影响。结果表明,PEK-C的加入对固化反应、耐热性能的影响较小,但会显著提升环氧树脂的韧性,且在一定范围内,PEK-C相对分子质量和添加量越大,增韧效果越好。15% 相对分子质量8×104的PEK-C改性树脂具有最佳力学性能,拉伸强度和断裂延伸率分别达到80 MPa和3.1%,较未改性树脂分别提高了68%和121%,冲击韧性高达23.3 kJ/m2,较未改性树脂提升了99%。采用透射电子显微镜表征了不同PEK-C含量改性树脂的微观相结构,结果表明,随PEK-C含量增加,依次观测到从海岛相到双连续再到相反转的相结构转变。

    Abstract:

    In view of the low toughness of high temperature epoxy resin, phenolphthalein-based polyaryletherketone (PEK-C) was adopted to toughen and modify high temperature epoxy resin. The effects of the molecular weight and content of PEK-C on the curing reaction, toughening effect and heat resistance of the modified resin were studied. The results show that the addition of PEK-C has little effect on the curing reaction and heat resistance, but it can significantly improve the toughness of the epoxy resin. The 15% PEK-C with the molecular weight of 8×104 modified resin has the best mechanical properties, the tensile strength and elongation at break reach 80 MPa and 3.1%, respectively, which are 68% and 121% higher than those of the unmodified resin, respectively. The impact toughness is ss high as 23.3 kJ/m2, which is 99% higher than that of the unmodified resin. The microphase structures of the modified resins with different PEK-C contents were characterized by transmission electron microscopy (TEM). With the increase of PEK-C content, the phase structure transition from sea-island phase to bicontinuous phase inversion was sequentially observed.

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  • 收稿日期:2021-12-23
  • 最后修改日期:2022-03-31
  • 录用日期:2022-04-01
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