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Improving the toughness of thermosetting epoxy resins via blending triblock copolymers

机译：通过混合三嵌段共聚物改善热固性环氧树脂的韧性

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摘要

In this study, the triblock copolymer poly(methyl methacrylate)-b-poly(butyl acrylate)-b-poly(methyl methacrylate) (MAM) was used to modify bisphenol A epoxy resin to improve its toughness. The effects of MAM on the curing behaviors, mechanical properties, fracture morphology and thermal properties of epoxy were carefully studied. The results of dissolution experiments show that MAM has good compatibility with epoxy resin under certain conditions. FT-IR and DSC analyses show that adding MAM to epoxy hinders the curing reaction of epoxy resin, without participating in the curing reaction and changing the curing mechanism. The mechanical properties indicated by K-IC and impact strength with an MAM content of 10 phr for the toughened system increase by 91.5% and 83.5%, respectively, compared to the situation without MAM, which may ascribed to the nanoparticles formed during the process of MAM/epoxy blending. In the curing process of an epoxy resin, the typical phase structure that occurs through the self-assembly process can be clearly observed in the MAM/epoxy blends. As the MAM content increases, the amount of nanoparticles gradually increases. This work further confirms that the toughness of the composite material was enhanced to a large extent without significantly decreasing the glass transition temperature of the blends.
机译：在该研究中，使用三嵌段共聚物聚（甲基丙烯酸甲酯）-B-聚（丙烯酸丁酯）-B-聚（甲基丙烯酸甲酯）（MAM）来改变双酚A环氧树脂以改善其韧性。仔细研究了MAM对环氧树脂的固化行为，机械性能，断裂形态和热性质的影响。溶解实验结果表明，MAM在某些条件下与环氧树脂具有良好的相容性。 FT-IR和DSC分析表明，将MAM加入环氧树脂阻碍环氧树脂的固化反应，而不参与固化反应并改变固化机制。通过K-IC和冲击强度指示的机械性能分别为10phr的MAM含量，其增韧系统分别增加了91.5％和83.5％，而没有妈妈的情况，这可能归因于在过程中形成的纳米颗粒MAM /环氧混合。在环氧树脂的固化过程中，可以在MAM /环氧混合物中清楚地观察通过自组装过程发生的典型相结构。随着MAM含量的增加，纳米颗粒的量逐渐增加。该工作进一步证实，在很大程度上增强了复合材料的韧性，而不会显着降低共混物的玻璃化转变温度。

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  • 来源
    《RSC Advances》 |2020年第3期|共10页
  • 作者

    Tao Lei; Sun Zeyu; Min Wei; Ou Hanwen; Qi Liangliang; Yu Muhuo;

  • 作者单位

    Donghua Univ Coll Mat Sci &

    Engn State Key Lab Modificat Chem Fibers &

    Polymer Mat Shanghai 201620 Peoples R China;

    Donghua Univ Coll Mat Sci &

    Engn State Key Lab Modificat Chem Fibers &

    Polymer Mat Shanghai 201620 Peoples R China;

    Donghua Univ Coll Mat Sci &

    Engn State Key Lab Modificat Chem Fibers &

    Polymer Mat Shanghai 201620 Peoples R China;

    Donghua Univ Coll Mat Sci &

    Engn State Key Lab Modificat Chem Fibers &

    Polymer Mat Shanghai 201620 Peoples R China;

    Donghua Univ Coll Mat Sci &

    Engn State Key Lab Modificat Chem Fibers &

    Polymer Mat Shanghai 201620 Peoples R China;

    Donghua Univ Coll Mat Sci &

    Engn State Key Lab Modificat Chem Fibers &

    Polymer Mat Shanghai 201620 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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