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首页> 外文期刊>Journal of Applied Polymer Science >Mechanical properties of recycled LDPE/EVA/ground tyre rubber blends: Effects of EVA content and postirradiation
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Mechanical properties of recycled LDPE/EVA/ground tyre rubber blends: Effects of EVA content and postirradiation

机译：再生LDPE / EVA /地面轮胎橡胶共混物的机械性能：EVA含量和辐照后的影响

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摘要

Thermoplastic elastomers were prepared from recycled low density polyethylene [rLDPE] and virgin low density polyethylene (LDPE), respectively, ground tyre rubber (GTR), and ethylene vinyl acetate (EVA) copolymer. The amounts of the rLDPE and GTR were fixed at 40 and 30 wt %, respectively, in the formulations, whereas the LDPE and EVA contents varied each between 0 and 30 wt %. The fresh LDPE served for reduction of the melt viscosity and EVA was used for improving the elastomeric properties. Blends of different compositions (by varying the LDPE/EVA ratio) were produced by twin-screw extrusion and pelletized. Specimens were produced by injection molding and subjected to tensile and instrumented falling weight impact (IFWI) tests. To improve the mechanical performance of the blends, the injection molded specimens were electron beam irradiated at 150 kGy absorbed dose. Static tensile and hysteresis, IFWI and dynamic mechanical thermal analysis tests were performed on the specimens and the fracture surface was inspected with a scanning electron microscope. The results indicated that better rubber-like properties were achieved with increasing EVA content. Moreover, postirradiation proved to be very beneficial, especially for blends containing relative high amounts of EVA.
机译：分别由回收的低密度聚乙烯[rLDPE]和原始低密度聚乙烯（LDPE），磨碎的轮胎橡胶（GTR）和乙烯乙酸乙烯酯（EVA）共聚物制备热塑性弹性体。在制剂中，rLDPE和GTR的量分别固定为40和30重量％，而LDPE和EVA的含量分别在0和30重量％之间变化。新鲜的LDPE用于降低熔体粘度，而EVA用于改善弹性体性能。通过双螺杆挤出和造粒来生产不同组成的共混物（通过改变LDPE / EVA比例）。样品通过注塑成型生产，并经受拉伸和仪器化的落锤冲击（IFWI）测试。为了改善共混物的机械性能，以150 kGy的吸收剂量对注模样品进行电子束辐照。对样品进行静态拉伸和滞后，IFWI和动态机械热分析测试，并用扫描电子显微镜检查断裂表面。结果表明，随着EVA含量的增加，可以获得更好的类橡胶性能。此外，辐射后被证明是非常有益的，特别是对于含有相对大量EVA的混合物。

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