EFFECT OF VIRGIN HETEROPHASIC PP COPOLYMER CONTENT ON MOISTURE ABSORPTION, THERMAL AND MECHANICAL PROPERTIES OF RECYCLED POLYETHYLENE WOOD FLOUR COMPOSITES

Journal of The Chilean Chemical Society

ZUNIGA, ALEJANDRO¹  ARANGO, CAROLINA¹  RODRÍGUEZ-LLAMAZARES, SADDYS¹  CASTAÑO, JOHANNA² 

[1] Centro de Investigación de Polímeros Avanzados, Concepción, Chile;Universidad de Concepción, Coronel, Chile

关键词: recycled LDPE-;    PPblend;    wood plastic composite;    mechanical properties;    water absorption properties;   

DOI  :  10.4067/S0717-97072014000100027

学科分类：化学（综合）

来源: Sociedad Chilena de Quimica

【 摘 要 】

The effect of virgin heterophasicPP copolymer (vPP) content on moisture absorption, as well as on thermal andmechanical properties of recycled polyethylene/wood flour composites was investigated.The polymer matrix of recycled post-consumed plastic waste (rPE) wascomposedof a matrix of LDPE and a part of PP. Wood flour of Pinus radiata was used as filler at a constant loading of 45 wt.%. rPE/vPP blends and theircompositeswere manufactured by melt blending, and then by injection molding. The morphology of the blends and composites was analyzed by means of scanning electronmicroscopy.The addition of vPP improved tensile and flexural moduli and flexural strength of wood plastic composites (WPC). The highest increase of these propertieswasobserved for a WPC sample with a rPE/vPP ratio of 19. WPC made with highervirginPP content (rPE/vPP ratio = 9 and 5.7) showed lower increase ofmechanical propertiescompared to polymer matrix and WrPE samples. The moisture uptake of WPC made of rPE/vPP blend was higher than those of rPE, and their mechanical properties were more adversely affected by immersion in water. TGA results indicate that rPE are thermally more stable than rPE/vPP blends. The incorporation ofheterophasicPP copolymer into the recycled polymer matrix of WPC delays the starting of wood flour degradation.

【 授权许可】

Unknown