Effect of elastomer on the properties of glue-free PP/EVA composite films
Three-layer glue-free composite films based on a PP/EVA/elastomer blending system were prepared through melt blending and cast co-extrusion using EVA as an adhesive layer and different elastomers as a compatibilizer for the PP core layer and adhesive layer.The resultant blending system was analyzed by means of mechanical tests,DMA tests,rheological tests,and scanning electron microscopy,and the properties of the composite films were investigated.The results indicated that there was an optimal bonding effect on paper when using the EVA containing 18 wt% vinyl ace-tate.The PBE elastomer exhibited a more significant improvement in the mechanical properties than POE.The glass transition temperature of PP and EVA increased gradually with an increase in the PBE content,and meanwhile the curva-ture of Cole-Cole also increased gradually,indicating that the compatibility between PP and EVA became better and bet-ter.When the content of PBE in the EVA adhesive layer was 30 wt%,the tensile strength of the composite films reached a maximum value of 29 MPa.The adhesive strength of the composite films with paper reached at maximum val-ue of 9 N/15 mm at a PBE content of 20 wt% .The core layer and adhesive layer cannot be peeled off for the composite films at a PBE content of 25 wt% .The composite films are robust without delamination in this case.The optimal load-ing of PBE in the adhesive layer was determined to be 25 wt% .
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