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Experimental Estimation of Relaxation Behavior for Hemp Fiber Reinforced Polypropylene Composite with Torque Rheometer

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Abstract

Relaxation behavior of natural fiber reinforced polymer composites exists in both solid and molten state and profoundly affects the control and optimization of processing parameters and dimensional accuracy of final products. The aim of this study was to establish an experimental estimating method to characterize relaxation behavior of polymer composite with traditional torque rheometer and investigate the effects of fiber concentration, dimension, and processing parameters on the relaxation behavior. Relaxation time of hemp fiber reinforced polypropylene composite were obtained by fitting the experimental torque data and corelated to the buckling deformation of packaging boxes manufactured by injection with the same injection parameters. The results show that all the increasing concentration of hemp fiber, higher rotor speed, and higher temperature can significantly decrease the relaxation time and result in a stable and better dimensional accuracy of injection packaging boxes. The finer fibers with the same weight concertation can bring an obvious reduction in relaxation time and buckling deformation. The proposed method for estimating relaxation behavior of polymer composite is a feasible and cost-effective way to investigate the viscoelastic properties of polymer composites close to the real processing conditions. And it can be widely used in optimization of processing parameters and performance of polymer composite products.

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Authors and Affiliations

  1. Hunan Provincial Key Laboratory of Comprehensive Utilization of Agricultural and Animal Husbandry Waste Resources, Hunan International Scientific and Technological Cooperation Base of Biopolymer Fiber Materials and Application, National and Local Joint Engineering Research Center of Advanced Packing Materials Technology, School of Urban and Environmental Science, Hunan University of Technology, Zhuzhou, 412007, P. R. China

    Taijun Jiang, Guangsheng Zeng & Can Hu

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  1. Taijun Jiang
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  2. Guangsheng Zeng
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  3. Can Hu
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Correspondence to Guangsheng Zeng.

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Acknowledgments: This work was supported by National Natural Science Foundation of China under grant 51973056, the key research and development plan of Hunan technology department under grant 2017WK2042, scientific research projects of Hunan provincial department of education under grant 18A258 and 18C0524, and Hunan provincial scientific research and innovation project under grant CX20190843 and CX20190844.

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Jiang, T., Zeng, G. & Hu, C. Experimental Estimation of Relaxation Behavior for Hemp Fiber Reinforced Polypropylene Composite with Torque Rheometer. Macromol. Res. 28, 517–522 (2020). https://doi.org/10.1007/s13233-020-8059-3

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  • DOI: https://doi.org/10.1007/s13233-020-8059-3

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