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Thermoplastic Starch Processing and Characteristics—A Review

2014; Taylor & Francis; Volume: 54; Issue: 10 Linguagem: Inglês

10.1080/10408398.2011.636156

1549-7852

Yachuan Zhang, Curtis Rempel, Qiang Liu,

Food composition and properties

Abstract Canola Council of Canada, Winnipeg, Manitoba, Canada The rising costs of nonrenewable feedstocks and environmental concerns with their industrial usage have encouraged the study and development of renewable products, including thermoplastic starch (TPS). Starch is an abundant, plant-based biodegradable material with interesting physicochemical characteristics that can be exploited, and this has received attention for development of TPS products. Starch exhibits usable thermoplastic properties when plasticizers, elevated temperatures, and shear are present. The choice of plasticizer has an effect on TPS, even when these have similar plasticization principles. Most TPS have glass transition temperature, Tg, in the range of approximately −75 to 10°C. Glassy transition of TPS is detected by differential scanning calorimeter (DSC) and thermodynamic analyzer (DMA), although DMA has been found to be more sensitive and effective. TPS has low tensile properties, typically below 6 MPa in tensile strength (TS). The addition of synthetic polymers, nanoclay, and fiber can improve TS and water-resistance ability. The moisture sorption behavior of TPS is described in GAB and BET models, from which monolayer moisture content and specific area are derived. Current studies on surface tension, gas permeability, crystallinity, and so on of the TPS are also reviewed. Keywords: Biodegradable packagingstarch-based bioplasticsbiopolymersplasticization ACKNOWLEDGMENTS This review paper was supported financially by the Manitoba Functional Foods Opportunities Program (MFFOP) funded by Manitoba Agriculture and Rural Development Initiative (MARDI), and BioPotato Network, Agricultural Bioproducts Innovation Program (ABIP) funded by Agriculture & Agri-Food Canada.