Study on Changes in Physical Properties and Thermal Behavior of Thermoplastic Starch (TPS)-Polypropylene (PP) Composite due to UV (photo-oxidation) Treatment and the Effect of UV-treated TPS-PP (UV-TPS-PP) on Biodegradability 


Vol. 61,  No. 1, pp. 41-45, Feb.  2024
10.12772/TSE.2023.61.041


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  Abstract

PP (polypropylene), which was previously used for general purposes, has a chemical structure that is difficult to decompose and has become a cause of environmental pollution. Therefore, a composite material was manufactured by adding TPS (thermoplastic starch), which can be biodegraded under composting conditions. The manufactured composite material was UV (photo oxidized) treated with cycle C according to the ASTM D 6954 standard for composite biodegradation. In the case of the UV-treated composite material, the molecular weight was reduced by 98.1% due to photo oxidation, and the melting peak was shifted to 132 oC and 43.6%. % melting enthalpy decreased. As a result of the analysis, it was confirmed that defects occurred in the composite material and polymer chains were broken due to photo-oxidation. The composting biodegradability test was conducted in accordance with ISO 14855-1, and after 180 days, the decomposition rate was 53.1% for TPS-PP composite material and 8.9% for UV-TPS-PP composite material, which is due to the photo oxidation process in the case of UV-TPS-PP composite material. It is judged that the degree of decomposition of gelation is low. Through continued research, it is judged that additional research is needed on how gelation occurs in PP due to photo-oxidation caused by UV treatment.

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pISSN : 1225 - 1089
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한국연구재단 우수등재학술지 유지 (2022년)