This study explores the effect of polypropylene grafted maleic anhydride (PP-g-MA) and ethylene-butylacrylate-glycidylmethacrylate (EBA-GMA) compatibilizers on the mechanical and thermal properties of biodegradable poly(lactic acid) (PLA)/poly(butylene succinate) (PBS) (80/20) blends. While PLA provides high strength, its brittleness limits its use; PBS adds flexibility but is poorly compatible with PLA. To address interfacial incompatibility, the two compatibilizers were added both individually and in combination at concentrations ranging from 0.25 to 5 phr. The blends were characterized through tensile testing, differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), rheological analysis, and dynamic mechanical analysis (DMA). The addition of 0.75 phr of a 50:50 PP-g-MA/EBA-GMA mixture yielded the highest tensile strength and the lowest loss tangent, which indicates improved interfacial adhesion and reduced phase separation. These results demonstrate that the synergistic use of PP-g-MA and EBA-GMA improves blend compatibility and mechanical performance, providing an effective strategy for enhancing the processability and durability of PLA/PBS materials for broader application in sustainable polymer-based products.

본 연구는 생분해성 고분자인 poly(lactic acid)(PLA)/poly(butylene succinate)(PBS)(80/20) 블렌드의 기계적 및 열적 특성 향상을 위해 상용화제 polypropylene grafted maleic anhydride(PP-g-MA)와 ethylene-butylacrylate-glycidylmethacrylate(EBA-GMA)의 효과를 분석하였다. 각 상용화제는 0.25-5 phr 범위에서 단독 및 혼합 형태로 첨가되었으며, 인장 시험, 시차주사열분석(DSC), 푸리에 변환 적외선분광법(FTIR), X-선 회절(XRD), 유변학 및 동적기계분석(DMA) 분석을 통해 특성을 평가하였다. PP-g-MA와 EBA-GMA를 0.75 phr, 50:50 비율로 혼합한 조건에서 가장 높은 인장강도와 가장 낮은 손실탄젠트가 나타났으며, 이는 계면 접착력 향상과 상분리 억제에 기인한 결과로 해석된다. 두 상용화제의 상호작용은 PLA/PBS 블렌드의 기계적 물성을 높이는 데 효과적이었다.

Keywords: poly(lactic acid), poly(butylene succinate), polypropylene grafted maleic anhydride, ethylene-butylacrylate-glycidylmethacrylate, compatibilizer.