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Curing kinetics and mechanical properties of bio-based composite using rosin-sourced anhydrides as curing agent for hot-melt prepreg

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Abstract

In this study, a novel bio-based thermosetting system has been developed from epoxy resin (EP), with rosin-sourced anhydrides (maleopimaric acid, RAM) as curing agent and imidazole type latent catalyst (two amino imidazole salt complex, IMA), to be used as matrix for hot-melt prepreg curing at mid-temperature. For comparison, the epoxy resin system with petroleum sourced hardener methylhexahydrophthalicanhydride (MHHPA) was also examined. The curing behaviour and mechanism were investigated by non-isothermal differential scanning calorimeter (DSC) analysis and Fourier transform infrared (FTIR) spectra. The results showed that the curing course of bio-based epoxy resin system containing RAM included two stages, which were the reaction between the free carboxyl group of RAM and oxirane ring under the acceleration of IMA, and the main reaction attributed to the reaction between anhydride and oxirane. According to Kissinger method, the reaction activation energy (E a ) of two stages were 68.9 and 86.5 kJ mol‒1, respectively. The E a of EP/MHHPA and EP/IMA resin system were 81.04 and 77.9 kJ mol‒1. The processing property of EP/RAM/IMA system, i.e. the relationship between viscosity-temperature-time, was characterized by cone-plate viscometer aim to decide the processing parameter of prepreg preparation. The effect of RAM content on mechanical performance and dynamic mechanical property was investigated. Noteworthily, compared with the laminates with EP/MHHPA as matrix, the laminates with RAM as hardeners achieved a 44%, 73% and 70°C increase in bending strength, bending modulus and the glass transition temperature, respectively, due to the bulky hydrogenated phenanthrene ring structure incorporated into the cross-linking networks. When the fiber volume fraction reached 47%, the mechanical property of the laminates prepared with hot melt prepreg was superior or comparable to that of composites with pure petroleum sourced matrix. RAM as cross-linking agent of epoxy resin holds a great potential to satisfy the requirement of composites such as structure and secondary structure parts preparation.

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Authors and Affiliations

  1. Bei**g Institute of Aeronautical Materials, Bei**g, 100095, China

    XuFeng Zhang, JiaHu Wei & **aoSu Yi

  2. Aviation Composite Corparation (Bei**g) Science and Technology Co., Ltd, Bei**g, 101300, China

    YunQiQiGe Wu, JianFeng Tong & **aoSu Yi

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  1. XuFeng Zhang
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  2. YunQiQiGe Wu
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  5. **aoSu Yi
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Correspondence to **aoSu Yi.

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Zhang, X., Wu, Y., Wei, J. et al. Curing kinetics and mechanical properties of bio-based composite using rosin-sourced anhydrides as curing agent for hot-melt prepreg. Sci. China Technol. Sci. 60, 1318–1331 (2017). https://doi.org/10.1007/s11431-016-9029-y

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