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Curing kinetics of pre-crosslinked carboxyl-terminated butadiene acrylonitrile (CTBN) modified epoxy blends

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Abstract

The purpose of this study is to investigate the curing kinetics of neat and pre-crosslinked or non-crosslinked carboxyl-terminated butadiene acrylonitrile liquid rubber (CTBN) toughened epoxies cured with isophorone diamine (IPDA) using non-isothermal and isothermal differential scanning calorimetry. The results show that CTBN has a complex effect on the curing process of epoxy/IPDA systems. The carboxyl groups of CTBN can accelerate the curing reactions, while the phase-separated CTBN particles and the dilution of curing ingredients caused by CTBN addition can hinder the curing reactions, resulting in an increase in activation energy. Interestingly, the activation energy of pre-crosslinked CTBN/epoxy systems decreases compared to their non-crosslinked counterparts because of the enhanced curing effect of the benzoic acid produced by benzoyl peroxide (BPO). An autocatalytic Kamal’s model is successfully used to describe the curing process of epoxy systems studied.

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Acknowledgements

This research was supported by the National Science Foundation of China (No. 51073052) and the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. Shanghai Key Laboratory of Advanced Polymeric Materials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China

    Xiaoxue Song & Shiai Xu

  2. The Chemical Engineering College of Qinghai University, Xining, 810016, China

    Shiai Xu

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  1. Xiaoxue Song
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Correspondence to Shiai Xu.

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Song, X., Xu, S. Curing kinetics of pre-crosslinked carboxyl-terminated butadiene acrylonitrile (CTBN) modified epoxy blends. J Therm Anal Calorim 123, 319–327 (2016). https://doi.org/10.1007/s10973-015-4989-y

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  • DOI: https://doi.org/10.1007/s10973-015-4989-y

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