Biodegradation of Compostable Plastics in Green Yard-Waste Compost Environment |
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Authors: | Joseph Greene |
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Institution: | (1) Department of Mechanical Engineering, Mechatronic Engineering and Manufacturing Technology, California State University, Chico, CA 95929-0789, USA |
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Abstract: | Compostable plastic materials, produced from polylactic acid (PLA), corn starch, or sugarcane, degraded in a green yard-waste
compost environment. The compostable plastics claim to meet ASTM D6400 standards for biodegradation, sustainable plant growth,
and eco-toxicity. Biodegradation was measured by disintegration studies over 20 weeks. The commercially available compostable
products, made from PLA, sugarcane, or corn starch, biodegraded while in a commercial compost facility with other common yard
waste compostable items. The PLA container, cup, and knife completely degraded in 7 weeks at a rate similar to the Avicell
micro-cellulose control. The corn starch-based trash bag and sugarcane plate degraded at a similar rate as the Kraft paper
control. The three materials degraded between 80% and 90% after 20 weeks. |
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Keywords: | Biodegradable Compostable Plastics ASTM D6400 PLA |
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