A Novel Rare Earth Enhanced Epoxy Composites: Mechanical Properties, Thermal Stability and Curing Kinetics

IF 1 4区化学 Q4 POLYMER SCIENCE

Polymer Science, Series B Pub Date : 2024-07-02 DOI:10.1134/S1560090424600529

Junwei Li, Wenxue Lu, Dan Yang, Yanzhen Jia, Haobo Su, Jialing Deng, Zuo Gong, Yongke Zhao

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Abstract

The curing kinetics of the epoxy resin/nano rare earth oxides system were studied by non-isothermal differential scanning calorimetry. Curing reaction occurred with DSC thermal analyzers at heating rates of 5, 10, 15, and 20 K/min, respectively. Data on enthalpy changes during heating were collected. The kinetic parameters and curing temperature of the curing reaction of the epoxy resin/ nano rare earth oxides system were calculated by Kissinger–Ozawa, Crane method and T-β extrapolation method. The results showed that the rare earth compounds reduced the activation energy of the epoxy resin curing reaction, but did not change the curing mechanism of the epoxy resin. Studies on the influence of sample fracture morphology showed that the introduction of nano rare earth compounds plays an important role in improving the tensile properties of nanocomposites. When the 1% weight component of nano Gd₂O₃ was added to the composite, the tensile strength of the composite increased by 65.18%, the flexural strength and modulus increased by 57.92 and 70.04%, respectively, and the glass transition temperature increased by 17.55°C.

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新型稀土增强环氧树脂复合材料：机械性能、热稳定性和固化动力学

摘要采用非等温差示扫描量热法研究了环氧树脂/纳米稀土氧化物体系的固化动力学。使用 DSC 热分析仪分别以 5、10、15 和 20 K/min 的加热速率进行固化反应。收集了加热过程中的焓变数据。采用基辛格-奥泽法、克兰法和 T-β 外推法计算了环氧树脂/纳米稀土氧化物体系固化反应的动力学参数和固化温度。结果表明，稀土化合物降低了环氧树脂固化反应的活化能，但并没有改变环氧树脂的固化机理。对样品断口形貌影响的研究表明，纳米稀土化合物的引入对改善纳米复合材料的拉伸性能具有重要作用。当向复合材料中添加 1%重量组分的纳米 Gd2O3 时，复合材料的拉伸强度提高了 65.18%，弯曲强度和模量分别提高了 57.92% 和 70.04%，玻璃化转变温度提高了 17.55°C。

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来源期刊

Polymer Science, Series B 化学-高分子科学

CiteScore

1.80

自引率

8.30%

发文量

审稿时长

>0 weeks

期刊介绍： Polymer Science, Series B is a journal published in collaboration with the Russian Academy of Sciences. Series B experimental and theoretical papers and reviews dealing with the synthesis, kinetics, catalysis, and chemical transformations of macromolecules, supramolecular structures, and polymer matrix-based composites (6 issues a year). All journal series present original papers and reviews covering all fundamental aspects of macromolecular science. Contributions should be of marked novelty and interest for a broad readership. Articles may be written in English or Russian regardless of country and nationality of authors. All manuscripts are peer reviewed