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( Tae Woong Kong ),( In Tae Kim ),( Tridib Kumar Sinha ),( Junho Moon ),( Dong Ho Kim ),( Inseon Kim ),( Kwangyong Na ),( Min-woo Kim ),( Hye-lin Kim ),( Taegyeong Hyeong ),( Jeong Seok Oh ) 한국고무학회 2020 엘라스토머 및 콤포지트 Vol.55 No.4
Stearic acid (SA), polyethylene glycol (PEG), and malic acid (MA) have been used to modify the surface of waste gypsum to develop corresponding poly (butylene adipate-co-terephthalate) (PBAT) composites. According to the mechanical properties, MA-treated gypsum (MA-gypsum) showed the best performance, whereas SA-gypsum showed the worst performance. In contrast to SA and PEG (having -COOH and -OH as polar functional groups, respectively), the presence of both -OH and -COOH in MA is responsible for the superior surface treatment of gypsum and its better dispersion in the polymer matrix (as revealed by FE-SEM analyses). The presence of long aliphatic chain in SA is supposed to inhibit the dispersion of SA-gypsum. Further, the performance of MA-gypsum/PBAT was enhanced by adding polylactic acid (PLA). The maximum optimized contents of MA-gypsum and PLA are 20 and 7.5 wt% for developing a high-performance PBAT composite.