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Journal of Polymers and the Environment

, Volume 27, Issue 8, pp 1807–1820 | Cite as

New Thermoplastic Vulcanizate Based on Acetoacetoxy Functionalized Natural Rubber/Polyamide12 Blend Filled with Carbon Black

  • Bencha ThongnuanchanEmail author
  • Wanida Nantayos
  • Natinee Lopattananon
  • Suwat Rattanapan
  • Anoma Thitithammawong
  • Charoen Nakason
Original paper
  • 24 Downloads

Abstract

Thermoplastic vulcanizates (TPVs) based on blends of natural rubber (NR) grafted with poly(acetoacetoxyethyl methacrylate), NR-g-PAAEM, and polyamide12 (PA12) were prepared by the dynamic vulcanization technique. NR-g-PAAEM was first prepared and its surface free energy was evaluated by means of contact angles. Blends of NR-g-PAAEM and PA12 were then prepared at a 60/40 blend ratio (wt%) using a dynamic vulcanization technique. The results revealed that TPVs exhibited a dispersed-phase morphology. However, the TPVs filled with carbon black (CB) showed much smaller dispersed rubber particles when compared to the unfilled TPV. TEM analysis also revealed that the CB appeared to be mainly located within the NR-g-PAAEM phase. The presence of CB generally raised the melt viscosity and increased shear during melt-mixing, resulting in finer dispersion of the rubber particles. Additionally, a significant enhancement in the tensile properties of the TPV was also achieved by the incorporation of CB. The optimum tensile properties were attained by the addition 30 phr of CB. The results also showed that the incorporation of CB into the NR-g-PAAEM/PA12 TPVs improved their stress relaxation properties. Moreover, the effects of reprocessing on the mechanical properties of the TPV filled with CB were also investigated. Although the TPV filled with CB exhibited reprocessing capability, reprocessing at high temperature and shear forces was found to negatively affect its tensile properties, especially after the third reprocessing cycle.

Keywords

Thermoplastic vulcanizate Natural rubber Polyamide12 Acetoacetoxyethyl methacrylate 

Notes

Acknowledgements

This work was supported by the Research Fund of Prince of Songkla University, SIT590171M. The authors would like to thank the Research and Development Office (RDO) of Prince of Songkla University for assistance with editing the English language content of this article.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Rubber Technology and Polymer Science, Faculty of Science and TechnologyPrince of Songkla UniversityPattaniThailand
  2. 2.Faculty of Science and TechnologyRajamangala University of Technology SrivijayaNakhon Si ThammaratThailand
  3. 3.Faculty of Science and Industrial TechnologyPrince of Songkla UniversitySurat ThaniThailand

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