Influence of Coffee Oil Epoxide as a Bio-Based Plasticizer on the Thermal, Mechanical, and Barrier Performance of PHBV/Natural Rubber Blends.

Rinky Ghosh, Xiaoying Zhao, Marie Genevieve Boushelle, Yael Vodovotz

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Article in Polymers, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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4 authors.

Rinky GhoshDepartment of Food Science and Technology, The Ohio State University, 2015 Fyffe Road, Columbus, OH 43210, USA.ORCID 0009-0004-2131-4313

Xiaoying ZhaoSchool of Light Industry Science and Engineering, Beijing Technology and Business University, No. 33 Fucheng Road, Beijing 100048, China.

Marie Genevieve BoushelleDepartment of Chemistry and Biochemistry, The Ohio State University, 200 CBEC Building 151 W. Woodruff Ave. Columbus, OH 43210, USA.

Yael VodovotzDepartment of Food Science and Technology, The Ohio State University, 2015 Fyffe Road, Columbus, OH 43210, USA.

Funding

The Ohio State University Accelerator Award from The Ohio State University under the project titled "Overcoming Challenges to Commercialization of a Biobased, Biodegradable Rubbery Bioplastic: A Need for an Industrially Produced Prototype," led by PI: Vodovotz, Y.

6 · The paper itself

Abstract

This work evaluated the effect of coffee oil epoxide (COE), produced from coffee waste, on thermal, mechanical, barrier, and exudation resistance properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/natural rubber (PHBV/NR) blends. Building upon previously published 0.3% COE results, this study examined 0.4% and 0.75% concentrations to optimize performance. Thermal analysis revealed that COE incorporation significantly enhanced chain mobility, with glass transition temperature depressions of 6.1 °C and 7.4 °C for 0.4% and 0.75% COE formulations, respectively, compared to unplasticized PHBV/NR blends. Crystallinity decreased from 54.5% (PHBV/NR) to 52.6% and 51.9% with increasing plasticizer concentration, while melting temperatures decreased by 3.9% and 4.9%, confirming improved polymer chain mobility. Mechanical properties demonstrated COE's plasticizing effectiveness, with tensile strength decreasing by 13.3% (0.4% COE) and 16.2% (0.75% COE) compared to PHBV/NR blends. Young's modulus similarly decreased by 21.0% and 24.0%, while elongation at break improved slightly with increasing COE content. Barrier properties improved substantially across all concentrations: water vapor transmission rates decreased from 4.05 g/m

Indexed as

barrier propertiesbio-plasticizercoffee oil epoxidenatural rubberPHBVsustainable packagingthermal properties

Identifiers

PMID41599534

DOI10.3390/polym18020240

PMCPMC12846030

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