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Epoxidized soybean oil grafted with CTBN as a novel toughener for improving the fracture toughness and mechanical properties of epoxy resin

Polymer Journal volume 52, pages 345–357 (2020)Cite this article

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Abstract

We prepared epoxidized soybean oil (ESO) grafted with carboxyl-terminated poly(acrylonitrile-co-butadiene) (CTBN) (ESO-g-CTBN) by a ring-opening reaction between the epoxide group and the carboxyl group. The structural features of the resulting product were determined using modern analytical techniques, such as Fourier transform infrared (FTIR) spectroscopy, proton nuclear magnetic resonance (1H NMR) spectroscopy, and gel permeation chromatography (GPC). The ESO-g-CTBN was applied as a toughener for an epoxy resin-based composite that was fabricated by blending the epoxy resin with diethylenetriamine (DETA) as the curing agent. The main aim of this procedure is to simultaneously improve the mechanical properties and fracture toughness of a bisphenol A-based epoxy resin. When 15 phr of ESO-g-CTBN was added to the EP/DETA mixture, the resin fracture toughness (KIC) and tensile strength increased from 0.65 to 1.09 MPa m1/2 and from 34.42 to 42.55 MPa, respectively. The ESO-g-CTBN existed in the EP matrix as a separate phase and induced an increase in the KIC via stopping crack growth or changing the crack direction.

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Acknowledgements

This research was funded by the Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 104.02–2017.15.

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Authors and Affiliations

  1. Sustainable Management of Natural Resources and Environment Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam

    Quang-Vu Bach

  2. Institute of Research and Development, Duy Tan University, Danang, 550000, Vietnam

    Cuong Manh Vu

  3. AQP Research and Control Pharmaceuticals Joint Stock Company (AQP Pharma J.S.C), Dong Da, Hanoi, Vietnam

    Huong Thi Vu

  4. Institute for Tropical Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam

    Thai Hoang

  5. Phenikaa University, Yen Nghia, Ha Dong, Hanoi, Vietnam

    Tran Vinh Dieu

  6. Department of Environmental Energy & Engineering, Kyonggi University, Suwon, 442-760, Korea

    Dinh Duc Nguyen

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  1. Quang-Vu Bach
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  4. Thai Hoang
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Correspondence to Cuong Manh Vu.

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Bach, QV., Vu, C.M., Vu, H.T. et al. Epoxidized soybean oil grafted with CTBN as a novel toughener for improving the fracture toughness and mechanical properties of epoxy resin. Polym J 52, 345–357 (2020). https://doi.org/10.1038/s41428-019-0275-3

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