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由聚丙烯(PP)、高密度聚乙烯(HDPE)和聚苯乙烯(PS)组成的混合废旧塑料与木粉经高速混合机混合后,采用双螺杆/单螺杆串联挤出机组制备了木粉/混合废旧塑料复合材料。探讨了马来酸酐接枝苯乙烯-乙烯/丁烯-苯乙烯嵌段共聚物(SEBS-g-MAH)和原位接枝马来酸酐(MAH)对木粉/混合废旧塑料复合材料力学性能的影响。结果表明,与使用MAH和DCP的原位反应共混相比,SEBS-g-MAH显著提高了复合材料的抗冲击性能,但对拉伸和弯曲性能的改善不如原位反应共混显著。总的来说,混合废旧塑料制备的复合材料的力学性能要低于纯塑料混合物制备的复合材料,尤其是拉伸断裂伸长率。微观形态研究表明,添加SEBS-g-MAH和原位接枝MAH均可提高木粉与塑料混合物之间的界面相容性,但与添加SEBS-g-MAH相比,原位接枝MAH能更好的改善PP、HDPE、PS与木粉之间的界面结合。原位接枝MAH可被看作是一种改善木粉与塑料混合物间界面相容性的有效途径。此外,采用动态力学分析(DMA)进一步表征了复合材料的储能模量和阻尼因子。
After the mixed waste plastic and wood flour composed of polypropylene (PP), high density polyethylene (HDPE) and polystyrene (PS) were mixed by a high-speed mixer, the wood flour was prepared by a twin screw / single screw serial extruder Mixed waste plastic composite materials. The effects of maleic anhydride grafted styrene-ethylene / butylene-styrene block copolymer (SEBS-g-MAH) and in-situ grafted maleic anhydride (MAH) on the mechanical properties of wood flour / mixed waste plastics composites Impact. The results showed that the SEBS-g-MAH significantly improved the impact resistance of the composites compared with the in-situ reaction blends using MAH and DCP, but the improvement of tensile and flexural properties was not as significant as that of the in situ reaction blends. In general, composites prepared from mixed waste plastic have lower mechanical properties than composites made from pure plastic compounds, especially tensile elongation at break. Micro-morphology studies showed that the addition of SEBS-g-MAH and in situ grafted MAH can improve the interfacial compatibility between wood flour and plastic mixture, but compared with the addition of SEBS-g-MAH, in situ grafting MAH Better to improve the interface between PP, HDPE, PS and wood flour. In situ grafting of MAH can be seen as an effective way to improve the interfacial compatibility between wood flour and plastic mixtures. In addition, dynamic mechanical analysis (DMA) was used to further characterize the storage modulus and damping factor of the composites.