Do, Taegu Ko, Young Gun Chun, Youngsang Shin, Young Kil Kim, Young Gug Choi, Ung Su 2024-01-20T01:01:57Z 2024-01-20T01:01:57Z 2021-09-04 2017-08 0032-3888 https://pubs.kist.re.kr/handle/201004/122488 To enhance the flexural strength of degradable expanded polystyrene (DEPS) while maintaining degradability, during the manufacturing processes of DEPS, cerium(III) stearate (CeSt(3)) and poly-L-lactide (PLLA)/poly(butylene adipateco-terephthalate) (PBAT) are used as a nontoxic oxidizer and a co-biodegradable polymer filler, respectively. The flexural strength of DEPS is decreased by the oxidizer and increased by the biodegradable polymers. Furthermore, by favorable interfacial interaction between PLLA and PBAT, the flexural strength is more enhanced when the two biodegradable polymers are used simultaneously than used separately. The photo-, bio-and oxo-degradation behaviors of DEPS were evaluated by UV irradiation, thermal treatments, landfill, and non-landfill tests. Molecular weight of our DEPS is decreased to 90.26% after 2 weeks of UV irradiation and 74.4% after 3 months of thermal treatment test. 35.4 and 31.4% of weight of our DEPS is reduced after 3 months of landfill and non-landfill test. It is confirmed that the decomposition period of DEPS could be adjusted by controlling the amount of the oxidizer and/or the biodegradable polymers. The FT-IR study demonstrated that oligomers and nonylphenol which are known to cause the environmental hazards are not generated after the degradation of DEPS. POLYM. (C) 2016 Society of Plastics Engineers English WILEY Preparation of PLLA/PBAT-Strengthened Degradable Expanded Polystyrene Article 10.1002/pen.24465 1 POLYMER ENGINEERING AND SCIENCE, v.57, no.8, pp.883 - 890 POLYMER ENGINEERING AND SCIENCE 57 8 883 890 N scie scopus 000409172300011 2-s2.0-84990860375 Engineering, Chemical Polymer Science Engineering Polymer Science Article PHOTOCATALYTIC DEGRADATION POLY(LACTIC ACID) BIODEGRADABILITY DECOMPOSITION POLYLACTIDE PERFORMANCE BLENDS LIQUID FILM Degeadable polymer PLLA/PBAT Exoanded PS Prooxidant UV irradation