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Influence of blend ratio on properties of novel thermoplastic vulcanizates based on copolyester/epoxidized natural rubber blends

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Abstract

Novel thermoplastic vulcanizates based on copolyester (COPE) and epoxidized natural rubber with 30 mol% epoxide (ENR-30) were prepared with various blend ratios and their properties were investigated. The main target was to prepare the dynamically cured COPE/ENR-30 blends with low hardness (lower than 80 Shore A) but superior in damping properties. The mixing torque of the blend mixer was captured and it was found that increasing the fraction of rubber increased the final mixing torque. Dynamic mechanical properties of the blends were also determined. It was found that with increasing rubber proportion, storage modulus and complex viscosity were increased but tan δ was decreased. In addition, morphology of the blends shows increasing size of vulcanized rubber domains dispersed in the thermoplastic matrix with increasing of rubber proportion. However, the strength properties decreased in terms of Young’s and 100 % moduli, tensile strength, elongation-at-break, and hardness. This might be attributed to the increasing size of vulcanized rubber domains. Enhanced rubber elasticity and damping properties were observed with increasing rubber content in the blends, as indicated by decreased tension set and tan δ. Furthermore, temperature scanning stress relaxation results show that with increasing rubber content the blends had their relaxation curves shifted upwards and thermal resistance increased. In addition, thermal properties characterized by DSC show the decreasing heat of crystallization (H) of COPE, or decreasing crystallinity, with increasing rubber content.

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Acknowledgments

The authors would like to thank the Center of Excellence in Natural Rubber Technology (CoE-NR), Faculty of Science and Technology, Prince of Songkla University. Also, this work was supported by the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission. Contract No. SAT540523M.

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Authors and Affiliations

  1. Faculty of Science and Technology, Prince of Songkla University, Pattani, Thailand

    Krisna Sasdipan & Azizon Kaesaman

  2. Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani, Thailand

    Charoen Nakason

  3. Center of Excellence in Natural Rubber Technology (CoE-NR), Prince of Songkla University, Pattani, Thailand

    Krisna Sasdipan, Azizon Kaesaman & Charoen Nakason

  4. Faculty of Engineering and Computer Science, University of Applied Sciences of Osnabrück, Albrechtstr. 30, 49076, Osnabrück, Germany

    Norbert Vennemann

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  1. Krisna Sasdipan
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  2. Azizon Kaesaman
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  4. Charoen Nakason
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Correspondence to Charoen Nakason.

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Sasdipan, K., Kaesaman, A., Vennemann, N. et al. Influence of blend ratio on properties of novel thermoplastic vulcanizates based on copolyester/epoxidized natural rubber blends. Iran Polym J 23, 965–977 (2014). https://doi.org/10.1007/s13726-014-0292-1

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