Degradability comparison of poly(butylene adipate terephthalate) and its composites filled with starch and calcium carbonate in different aquatic environments
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Abstract
ABSTRACT We investigated the degradation behavior of biodegradable poly(butylene adipate terephthalate) (PBAT) and its composites containing starch (PBAT–starch) and calcium carbonate (PBAT–CaCO 3 ). The test splines were immersed in six different water bodies with various microbial compositions and salt concentrations for a 56 week period to obtain consistent experimental data. The results show that the pure PBAT degraded very slowly in the six water bodies, with a maximum weight loss of only 4.7% over the 56 week study period. Strips of the PBAT–starch composite showed a significantly accelerated biodegradation in microbe‐containing water; the degree of degradation depended largely on the type and abundance of microorganisms in the water bodies. Conversely, compared with the pure PBAT strips, PBAT–CaCO 3 showed less degradation in the various water bodies. A comparison of degradability between the strips immersed in sterilized distilled water and sterilized seawater indicated that inorganic salts did not significantly affect the degradation of PBAT. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 46916.
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