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Kinetics of Recycling CF/EP Composites by Thermal Excitation of Cr2O3

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Abstract

Recycling high performance carbon fibers (CFs) by thermal excitation of Cr2O3 semiconductor was proposed. The kinetic model of decomposition of epoxy resin was established and the method for solving kinetic parameters was proposed. The influences of temperature and treatment time on the decomposition rate of epoxy resin were investigated. The kinetic equation was established and the accuracy was verified experimentally. The morphology of the recycled CF was observed and monofilament tensile strength was determined. Results indicated that temperature and treatment time had positive correlation with decomposition rate of the epoxy resin. The reaction order n was 1.5, with excitation energy E of 85.03 kJ·mol−1 and pre-exponential factor k0 of 1.26 × 106 min−1. The established kinetic equation could be used to estimate the temperature and treatment time. Prolongation of treatment time could improve the monofilament tensile strength. The monofilament tensile strength of the recycled CF at 480 °C for 30 min was 102.72% of that of the original CF, indicating that surface heat treatment was performed on CF during the recycling process.

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Acknowledgements

This work is financially supported by National Natural Science Foundation of China (51705237 and 51775260), Natural Science Foundation of Higher Education Institutions of Jiangsu Province (17KJB460006) and Open Research Fund by Jiangsu Key Laboratory of Recycling and Reuse Technology for Mechanical and Electronic Products (RRME201806).

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Authors and Affiliations

  1. School of Mechanical Engineering, Nanjing Institute of Technology, Nanjing, 2311167, People’s Republic of China

    Huanbo Cheng, Yu Sun, Jie Zhang, Xin Wang & Jiahua Chang

  2. Jiangsu Key Laboratory of Recycling and Reuse Technology for Mechanical and Electronic Products, Changshu, 215500, People’s Republic of China

    Ziqiang Zhou

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  1. Huanbo Cheng
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  2. Yu Sun
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  3. Ziqiang Zhou
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  4. Jie Zhang
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  5. Xin Wang
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  6. Jiahua Chang
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Correspondence to Huanbo Cheng.

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Cheng, H., Sun, Y., Zhou, Z. et al. Kinetics of Recycling CF/EP Composites by Thermal Excitation of Cr2O3. J Polym Environ 27, 1937–1947 (2019). https://doi.org/10.1007/s10924-019-01482-3

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  • DOI: https://doi.org/10.1007/s10924-019-01482-3

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