PLA/PBAT/CaCO3 Composites with Balanced Super-Toughness and Stiffness through Dynamic Vulcanization and Double Interfacial Compatibilization

• DOI: 10.1021/acsapm.4c02812
• Publication Date: 2024-10-18T03:45:07Z
• Authors: Kai Cai; Qingdong Wang; Xiao Liu; Shuhua Tu; Jingsheng Wang; Jie Feng
• Keywords: Compatibilization; Toughening

The incorporation of biodegradable poly(butylene adipate-co-terephthalate) (PBAT) into poly(lactic acid) (PLA) is a simple method to improve the toughness PLA; however, toughening efficiency PBAT limited, and direct blending adversely impacts stiffness material. In this paper, surface nano-CaCO3 was modified with 3-Glycidoxypropyltrimethoxysilane (KH560) in order prepare CaCO3-g-KH560. A two-step extrusion process using multifunctional epoxy oligomers (ADR) as cross-linking agents used PLA/PBAT/CaCO3 ternary blends subinclusion structure. first extrusion, ADR CaCO3 nanoparticles were mixed PBAT. During second epoxide groups cross-linked dispersing phase, well co-cross-linked PLA continuous phase at PLA/PBAT interface. Fourier Transform Infrared Spectroscopy (FTIR) confirmed speculation. Additionally, Dynamic mechanical analysis (DMA) Scanning electron microscopy (SEM) analyses showed that co-cross-linking reaction improved interfacial compatibility PLA/PBAT. Energy dispersive spectrometer (EDS) Transmission (TEM) uniform dispersion phase. synergistic allowed for notched impact strength tensile prepared blend reach 74.5 kJ/m2 55.7 MPa (11 times 1.3 higher than same ratio, respectively). Compared elastomer alone, structure improves rigidity composite owing interactions distinct energy loss mechanism. This paper provides methodology preparation balanced stiffness.