填料对食品接触类聚丙烯复合材料结构与性能的影响OA北大核心CSTPCD

The polypropylene(PP)-based composites were prepared by introducing fillers such as wollastonite,whisker and talc into the PP/ethylene-octene copolymer/linear low density polyethylene by melt blending.The effects of these fillers on structures and properties of the PP-based composites were studied by DSC,SEM,DMA.The results show that the introduction of inorganic fillers improves the crystallization performance of PP-based composites.Moreover,compared with wollastonite and whisker,talc can effectively promote the regular arrangement of molecular chain segments between the layers,hence a relatively perfect filler network is formed in the matrix.As a result,the storage modulus of PP-based composites is enhanced,and the tensile strength and flexural strength are improved by 55.6%and 86.9%,respectively,with no obvious reduction in the impact strength at high amount.Ultimately,the content of small molecule precipitates is reduced to 1.49%(w),which can meet the application requirement of the food-contact materials.