Volume 40 Issue 11
Nov.  2023
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CAO Dongfeng, CHEN Xinchang, JI Yundong, et al. Interlaminar mechanical properties and heat resistance of silicone modified epoxy resin composites[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6098-6109. doi: 10.13801/j.cnki.fhclxb.20230109.001
Citation: CAO Dongfeng, CHEN Xinchang, JI Yundong, et al. Interlaminar mechanical properties and heat resistance of silicone modified epoxy resin composites[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6098-6109. doi: 10.13801/j.cnki.fhclxb.20230109.001

Interlaminar mechanical properties and heat resistance of silicone modified epoxy resin composites

doi: 10.13801/j.cnki.fhclxb.20230109.001
Funds:  National Natural Science Foundation of China (52273080); Open Fund for Advanced Energy Science and Technology Guangdong Provincial Laboratory Foshan Branch (Foshan Xianhu Laboratory) (XHT2020-002); Special Funds for Basic Scientific Research Business Expenses of Central Universities (2020III028GX; 2021III015JC; WUT2021IVA068)
  • Received Date: 2022-11-14
  • Accepted Date: 2022-12-25
  • Rev Recd Date: 2022-12-23
  • Available Online: 2023-01-11
  • Publish Date: 2023-11-01
  • The research on improving the interlayer mechanical properties and heat resistance of epoxy resin matrix composites through toughening modification of epoxy resin matrix has important engineering application value. Modified resin (ES) was prepared by condensation reaction of hydroxyl terminated polydimethylsiloxane and epoxy resin, and glass fiber reinforced modified epoxy resin matrix composite (ES-GF) was prepared by vacuum introduction method. The interlaminar mechanical properties of the composite were measured by double cantilever beam and short beam shear tests. The thermal resistance of the composite was evaluated by thermogravimetry and dynamic mechanical thermal testing. The interlaminar mechanical properties and thermal resistance of the corresponding glass fiber reinforced unmodified epoxy matrix composites (EP-GF) were also tested for compara-tive analysis. In order to analyze the physical mechanism of strengthening the interlaminar mechanical properties and improving the heat resistance of the composite, the tensile strength, tensile modulus, flexural strength, flexural modulus, tensile elongation at break, pendulum impact strength and microstructure characteristics of the epoxy resin before and after modification were also measured and characterized. The experimental results show that, compared with EP-GF, the release rate of type I critical strain energy (fracture toughness) of ES-GF is increased by 98.1%, and the interlaminar shear strength is increased by 13.3%. The strengthening of interlaminar mechanical properties is attributed to the comprehensive effect of Si—O bond flexible chain segment, "ductile points" playing a "nail anchor" role and improvement of fiber/matrix wettability. The maximum thermal weight loss rate of ES is decreased by 33.1%, and the final residue at 800℃ is increased by 13.5 times. Before glass transition temperature Tg, the storage modulus of ES-GF is 1.3 GPa higher than that of EP-GF, and after Tg, the storage modulus of ES-GF is nearly 1.3 GPa higher than that of EP-GF, and the glass transition temperature of siloxane modified epoxy resin is slightly increased.

     

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