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Toughness improvement of poly(lactic acid) with poly(vinyl propionate)‐grafted natural rubber

Natural rubber (NR) grafted with poly(vinyl propionate) (NR‐g‐PVP) was prepared by emulsion polymerization. The monomer content was set at 5, 10, 20, and 30 wt%. The chemical structure of NR‐g‐PVP was confirmed by 1H‐NMR and FTIR techniques. The grafting parameters of purified NR‐g‐PVP were evaluate...

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Bibliographic Details
Published in:Journal of applied polymer science 2021-10, Vol.138 (38), p.n/a
Main Authors: Jaratrotkamjorn, Ruedee, Tanrattanakul, Varaporn
Format: Article
Language:English
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Summary:Natural rubber (NR) grafted with poly(vinyl propionate) (NR‐g‐PVP) was prepared by emulsion polymerization. The monomer content was set at 5, 10, 20, and 30 wt%. The chemical structure of NR‐g‐PVP was confirmed by 1H‐NMR and FTIR techniques. The grafting parameters of purified NR‐g‐PVP were evaluated. Binary (PLA/NR and PLA/NR‐g‐PVP) and ternary (PLA/NR/NR‐g‐PVP) blends were prepared by melt blending using a twin‐screw extruder. The percentage of grafted PVP on NR affected morphology, thermal and mechanical properties of the blends. In binary blends, 5% grafting showed the greatest improvement of toughness and ductility with PLA, whereas there was no improvement in the mechanical properties of PLA/NR blend from using NR‐g‐PVP as a compatibilizer. The mechanical properties of the blends are related to mutual compatibility of the components. Good interfacial adhesion and proper particle size of NR were the key factors contributing to mechanical properties. The brittleness of polylactic acid (PLA) is a major problem limiting its applications. Natural rubber (NR) has been used to enhance the mechanical properties of PLA. However, NR and PLA are immiscible due to a different polarity resulting to poor interfacial adhesion between the two phases and large particle size of the dispersed phase. The grafting poly(vinyl propionate) (PVP) onto NR backbone is successfully to improve compatibility with PLA and enhance toughness of the blends.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.50980