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首页> 外文期刊>Journal of Applied Polymer Science >A Reactive Polymer for Toughening Epoxy Resin
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A Reactive Polymer for Toughening Epoxy Resin

机译：增韧环氧树脂的反应性聚合物

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摘要

Epoxy resins are hardly toughened by low weight content of tougheners. In this study, 5 wt % polyurea was adopted to significantly toughen piperidine-cured epoxy, as fracture toughness improved from 0.78 to 1.98 MPa m1/2. We focused on the reactions and morphology evolution of epoxy/ polyurea mixture. The polyurea molecular weight was reduced by the exchange reactions of polyurea with epoxy during mixing, as evidenced by gel permeation chromatograph and Fourier transform infrared spectroscopy. As a result, epoxy molecules were chemically bonded with polyurea, improving particle content and interface thickness. Transmission electron microscope observation shows that (a) polyurea in situ formed nanoparticles in matrix which ubsequently aggregate into micron-sized particles of thick interface with matrix; and (b) the particles became less stainable with increasing the mixing time, because the reactions promoted high levels of crosslink density of the particles which were thus more resistant to the diffusion of staining chemicals. onger mixing time improved, obviously, the fracture toughness of epoxy/polyurea composite.
机译：低含量的增韧剂很难使环氧树脂增韧。在这项研究中，采用5重量％的聚脲来显着增韧哌啶固化的环氧树脂，因为断裂韧性从0.78提高到1.98 MPa m1 / 2。我们专注于环氧/聚脲混合物的反应和形态演变。凝胶渗透色谱法和傅里叶变换红外光谱法证明，混合过程中聚脲与环氧树脂的交换反应降低了聚脲的分子量。结果，环氧分子与聚脲化学键合，从而改善了颗粒含量和界面厚度。透射电子显微镜观察表明：（a）聚脲在基质中原位形成纳米颗粒，随后聚集成与基质厚界面的微米级颗粒; （b）随着混合时间的增加，颗粒变得不易被污染，这是因为该反应促进了颗粒的高交联密度，从而更耐污染化学物质的扩散。混合时间的延长明显改善了环氧/聚脲复合材料的断裂韧性。

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