The Viscosity Effect of Masticated Natural vs. Synthetic Isoprene Rubber on Toughening of Polylactic Acid
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- Supanut Phattarateera
- Department of Chemical Engineering, Thammasat School of Engineering, Thammasat University, Pathum Thani 12120, Thailand
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- Cattaleeya Pattamaprom
- Department of Chemical Engineering, Thammasat School of Engineering, Thammasat University, Pathum Thani 12120, Thailand
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説明
<jats:p>This study investigated the different viscosity effects of natural isoprene rubber (NR) compared to the synthetic one (IR) on toughening of polylactic acid (PLA). Here, 15 wt% rubber was melt blended with PLA in an internal mixer at 180°C and 50 rpm. It was found that the addition of these rubbers led to a significant increase in the tensile toughness and impact strength. These rubbers were masticated at 50°C and at 200 rpm for various mastication times to reduce their molecular weights. A too-long mastication time was found to adversely affect the impact strength and tensile toughness due to the fast agglomeration of rubber particles. At a comparable viscosity, it was remarkable that the impact strength of PLA/NR was higher than that of PLA/IR regardless of the similar chemical structures probably because the presence of nonrubber components including proteins and lipids could enhance the interfacial interaction between NR and the PLA matrix.</jats:p>
収録刊行物
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- International Journal of Polymer Science
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International Journal of Polymer Science 2019 1-9, 2019-05-27
Wiley