关键词: 聚乳酸, 聚己二酸/对苯二甲酸丁二酯, 硅烷偶联剂, 接枝聚合物, 熔融沉积成型

Abstract:

PLA/PBAT/poplar powder （WF） composites were prepared by melt blending using poly（lactic acid） （PLA） and poly（butylene adipate-co-terephthalate） （PBAT） as matrices and WF as a filler. The standard test specimens were then prepared by a fused?deposition?modeling （FDM） technology. The effect of silane coupling agent （KH550） on the morphology， and rheological and mechanical properties of the composites was investigated with scanning electron microscopy observation， Fourier?transform infrared spectroscopy， rotational rheometer and mechanical test machine. The results indicated that the composites achieve an increase in tensile strength by 136 % at the coupling agent content of 3 wt%. The silane coupling agent could be covalently coupled with PLA and PBAT to form a grafted copolymer， and therefore the compatibility between two phases was improved. Meanwhile， the polycondensation reaction between the silane coupling agent and the hydroxyl group on the surface of WF could also effectively improve its compatibility with the PLA/PBAT matrix. As a result， the mechanical properties of the composites were greatly improved. The viscosity of the composites decreased with an increase of coupling agent content. When the content is 3 %， the wire achieved the optimum comprehensive printing performance at the coupling agent content of 3 wt%， resulting in an optimum quality for the printed products.

Key words: poly（lactic acid）, poly（butylene adipate-co-terephthalate）, silane coupling agent, graft copolymer, fused deposition modeling