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Cure characteristics and physico-mechanical properties of natural rubber/silica composites: effect of natural rubber-graft-poly(2-hydroxyethyl acrylate) content

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Abstract

The grafting of poly(2-hydroxyethyl acrylate) onto natural rubber (NRgPHEA) was used in order to compatibilize silica filler in NR composites. NR/silica compounds were prepared with various NRgPHEA contents from 0 to 12 phr, while the 14.5% grafting level in NRgPHEA and 20 phr silica content was held fixed. The cure characteristics of the compound were examined with a moving die rheometer. The physico-mechanical properties of NR/silica composites were analyzed by tensile testing, thermal gravimetric analysis, determination of bound rubber content and dynamic mechanical analysis. The results showed that scorch time and cure time decreased, while cure rate index increased with NRgPHEA content. The highest 100% modulus, 300% modulus, reinforcing index and tensile strength were obtained with 3 phr NRgPHEA. The addition of NRgPHEA can enhance wet skid resistance and thermal stability.

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Acknowledgements

This research was financially supported by a grant from the government budget of Prince of Songkla University, Contract No. SIT590171c, and by Prince of Songkla University, Surat Thani Campus, 2015. The authors would like to express their gratitude to the Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani Campus, and to the Research and Development Office (RDO). We are grateful to Assoc. Prof. Dr. Seppo Karrila for his assistance with manuscript preparation.

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  1. Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani Campus, Surat Thani, 84000, Thailand

    Warisara Borapak, Narong Chueangchayaphan, Skulrat Pichaiyut & Wannarat Chueangchayaphan

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  1. Warisara Borapak
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  2. Narong Chueangchayaphan
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  3. Skulrat Pichaiyut
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Correspondence to Wannarat Chueangchayaphan.

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Borapak, W., Chueangchayaphan, N., Pichaiyut, S. et al. Cure characteristics and physico-mechanical properties of natural rubber/silica composites: effect of natural rubber-graft-poly(2-hydroxyethyl acrylate) content. Polym. Bull. 78, 2009–2023 (2021). https://doi.org/10.1007/s00289-020-03199-z

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