Properties of bismaleimide resin modified by addition-curing phenolic and their composites

JIANG Weifang; WANG Linxiang; ZHENG Qing; YUAN Qiaolong; HUANG Farong

doi:10.13801/j.cnki.fhclxb.20220321.004

Volume 40 Issue 2

Feb. 2023

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JIANG Weifang, WANG Linxiang, ZHENG Qing, et al. Properties of bismaleimide resin modified by addition-curing phenolic and their composites[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 741-752. doi: 10.13801/j.cnki.fhclxb.20220321.004

Citation:

JIANG Weifang, WANG Linxiang, ZHENG Qing, et al. Properties of bismaleimide resin modified by addition-curing phenolic and their composites[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 741-752. doi: 10.13801/j.cnki.fhclxb.20220321.004

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Properties of bismaleimide resin modified by addition-curing phenolic and their composites

doi: 10.13801/j.cnki.fhclxb.20220321.004

1.
Key Laboratory of Specially Functional Polymeric Materials and Related Technology of the Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
2.
Shanghai Xinli Power Equipment Institute, Shanghai 200125, China

Received Date: 2022-01-04
Accepted Date: 2022-02-19
Rev Recd Date: 2022-01-28

Available Online: 2022-03-22

Publish Date: 2023-02-15

Abstract

Abstract

Bismaleimide (BMI) resin has been widely used in aerospace, electronics and other industrial fields because of its excellent properties. In order to meet the needs of structural components for high-speed aircraft, the additional phenolic modifier is introduced to improve the thermo-mechanical properties of BMI resin. The propargyl etherified novolac (PN) and allyl etherified phenolic (AN) as an addition modifier were synthesized by Williamson etherification. The PN and AN were used to modify N, N'-(4, 4'-diphenylmethylane) bismaleimide (BDM)/2, 2'-diallyl bisphenol A (DABPA) resin system (BD) in melting mixing to obtain the ternary blended resins of BDPN and BDAN. The processability and cure reactions of the BDPN and BDAN were studied. The thermal property and mechanical property of the cured BD, BDPN and BDAN were further investigated. The results show that the ternary blended resins exhibit good solubility and meltability, and have an above 50℃ of process window. There is only a single exothermal peak in DSC curves of BDPN and BDAN. The peak temperatures of BDPN and BDAN are lower than that of BD. The Fourier transform infrared (FTIR) was used to monitor the curing reactions of BD, BDPN and BDAN resins. The reactions of Ene, Diels-Alder, Claisen rearrangement and addition of alkyne and maleimido group were detected during curing. The cured PN resin has good thermo-oxidative stability. The residual yield at 800℃ (Y_r800℃) of cured BD in air increases from 3.7% to 23.1% after the BD resin was modified with PN resin. The temperature of 5wt% mass loss (T_d5) of the cured BDPN in air is higher than 400℃. The limited oxygen index (LOI) of the cured BD, BDPN and BDAN resins are 30.2%, 32.5% and 31.0%, respectively. The cured resins are nonflammable. The impact strength and flexural modulus of the cured BD resin increase with addition of PN and AN resins. The impact strength and flexural modulus of the cured AN modified BD resin increase by 19% and 30% respec-tively. However, the flexural strength of the BDPN and BDAN resins decrease since the crosslinked density of the cured modified resins decline. The water absorption in boiling water of the cured BDPN and BDAN resins are lower than that of the cured BD resin, and decrease by 8.6% and 14% after 40 h. The flexural strength, flexural modulus and interlaminar shear strength (ILSS) of the T300 carbon fiber cloth (T300CF) reinforced BDAN composite (T300CF/BDAN) at room temperature are higher than that of the T300CF reinforced BD composite. The flexural strength of the T300CF/BDPN at 200℃ retains a 98.6% retention, reaches to 575 MPa. The propargyl etherified novolac can used to improve the heat properties of bismaleimide which is a new approach for modification of bismaleimides, and promising to be utilized in preparation of the structural components of composite with heat-resistance at 200℃.
- propargyl etherified novolac,
- allyl etherified novolac,
- bismaleimide resin,
- blending modification,
- thermo-physical property
Long Abstrsct
Innovation Points

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References(38)

References

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