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Effects of gamma irradiation with and without compatibilizer on the mechanical properties of polypropylene/wood flour composites

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Abstract

In this study, polypropylene/wood flour (Hevea brasiliensis) composites at 40 wt% filler content were prepared using a twin-screw extruder and an injection moulding machine. The effects of gamma irradiation with and without maleic anhydride graft polypropylene (PP-g-MA) compatibilizer (3% relative to the wood flour content) on the flexural properties, tensile properties, and creep behavior were investigated. The irradiation in nitrogen and air atmospheres was performed at various radiation doses (i.e. 5, 10, 20 and 30 kGy). The results revealed the improvement of mechanical properties and creep behavior was found in the presence of gamma irradiation at low radiation doses (5 and 10 kGy), while the composites irradiated at radiation doses over 10 kGy rendered the decrease of mechanical properties. Furthermore, at the same radiation dose, the composites irradiated in nitrogen atmosphere tended to provide significantly higher mechanical properties than the ones irradiated in air atmosphere. Interestingly, the great enhancement of creep resistance was observed, i.e. the tensile strains (6 h of static loading) of the irradiated composites (at 10 kGy) with and without compatibilizer were approximately 36% and 19% lower than that of the untreated composite, respectively. In addition, the Burger’s creep model is applied in order to determine the creep parameters of the composites.

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Acknowledgements

This research receives financial supports from the Ratchadaphiseksomphot Endowment Fund of CU. Additional supports are from the Thailand Research Fund, the National Research University Fund, Ministry of Education, Thailand, and from the Centennial Anniversary of Chulalongkorn University Fund. The authors also would like to thank the Center of Excellence in Particle Technology, Chulalongkorn University, Thailand for the use of ball milling apparatus. Furthermore, the authors also gratefully acknowledge HMC Polymer Co. Ltd., Thailand, and DuPont Co. Ltd., Thailand, for the material supports in this research.

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Authors and Affiliations

  1. Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Pathumwan, Bangkok, 10330, Thailand

    Sarawut Rimdusit, Sujittra Wongsongyot & Sarot Jittarom

  2. Thailand Institute of Nuclear Technology, Ongkarak, Nakorn-nayok, 26120, Thailand

    Phiriyatorn Suwanmala

  3. Department of Chemistry, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaensaen, Nakorn Pathorm, 73140, Thailand

    Sunan Tiptipakorn

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  1. Sarawut Rimdusit
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  2. Sujittra Wongsongyot
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  4. Phiriyatorn Suwanmala
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  5. Sunan Tiptipakorn
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Correspondence to Sarawut Rimdusit.

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Rimdusit, S., Wongsongyot, S., Jittarom, S. et al. Effects of gamma irradiation with and without compatibilizer on the mechanical properties of polypropylene/wood flour composites. J Polym Res 18, 801–809 (2011). https://doi.org/10.1007/s10965-010-9477-2

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  • DOI: https://doi.org/10.1007/s10965-010-9477-2

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