Volume 136, Issue 15 47334
Article

Bio-based blends from poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and natural rubber for packaging applications

Xiaoying Zhao

Xiaoying Zhao

Department of Food Science and Technology, Ohio State University, 2015 Fyffe Road, Columbus, Ohio 43210

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Varun Venoor

Varun Venoor

William G. Lowrie Department of Chemical and Biomolecular Engineering, Ohio State University, 151 W. Woodruff, Columbus, Ohio 43210

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Kurt Koelling

Kurt Koelling

William G. Lowrie Department of Chemical and Biomolecular Engineering, Ohio State University, 151 W. Woodruff, Columbus, Ohio 43210

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Katrina Cornish

Katrina Cornish

Department of Horticulture and Crop Science, Ohio State University, 1680 Madison Avenue, Wooster, Ohio 44691

Department of Food, Agricultural and Biological Engineering, Ohio State University, 1680 Madison Avenue, Wooster, Ohio 44691

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Yael Vodovotz

Corresponding Author

Yael Vodovotz

Department of Food Science and Technology, Ohio State University, 2015 Fyffe Road, Columbus, Ohio 43210

Correspondence to: Y. Vodovotz ([email protected])Search for more papers by this author
First published: 18 December 2018
Citations: 29

ABSTRACT

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is a promising bioplastic but has limited packaging applications due to its brittleness and poor processability. Incorporation of highly viscous high-molecular-weight natural rubber (HMW-NR, gel extracted from NR) into PHBV can improve these properties. HMW-NR is not commercially available, impeding commercialization of the PHBV/rubber blends. Therefore, an organic peroxide was used to selectively crosslink NR to increase its viscosity during its melt blending with PHBV. The PHBV/NR blends were fabricated through a two-step extrusion process using a twin-screw extruder. The blends contained two phases with crosslinked rubber being dispersed in PHBV, and had clear rubber loading-dependent differences in performance. The thermal stability and melt strength of the blends were enhanced over pristine PHBV, indicating improved processability. The flexibility and toughness of the blends were improved by 59 and 20%, respectively, compared with pristine PHBV, and were comparable to commercial petroleum-based plastics. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47334.

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