Method of Producing Biodegradable Reference Material and its Biodegradability Based on International Standard Evaluation Method (ISO 14855-2) |
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Authors: | Masahiro Funabashi Fumi Ninomiya Masao Kunioka |
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Institution: | (1) Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), Higashi 1-1-1, Tsukuba Ibaraki, 305-8565, Japan |
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Abstract: | Returnable cups made of poly(lactic acid) (PLA) are employed as an example of products made of biodegradable plastics. Two
kinds of PLA samples plates and powders with different shapes were prepared from PLA cups. The plates were cut from a cup
using nippers. Powders were prepared using a rotation mechanical mixer for 45 min. PLA powders were separated by sieves with
60 meshes (250 μm) into a size ranging from 0 to 250 μm. An average diameter of powders separated by a sieve is 169 μm. Biodegradation
tests of PLA plates, PLA powders and cellulose powders in controlled compost at 58 °C were performed using a Microbial Oxidative
Degradation Analyzer (MODA) instrument according to ISO 14855-2. PLA powders showed almost the same biodegradation curve as
that of cellulose powders. PLA plates biodegraded at a slower rate than PLA powders. |
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Keywords: | Biodegradation Poly(lactic acid) Compost Products ISO 14855-2 ISO ASTM |
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