LDPE-g-PU的制备及其对MPU/UHMWPE力学性能的影响

Study on Preparation of LDPE-g-PU and Effect on Mechanical Properties of MPU/UHMWPE Blend

采用溶液接枝法、原位聚合法对低密度聚乙烯(LDPE)进行接枝改性,制得低密度聚乙烯接枝聚氨酯(LDPEg-PU),并用红外光谱、接触角、DSC对其进行表征;将LDPE-g-PU作为相容剂添加到混炼型聚氨酯/超高分子量聚乙烯(MPU/UHMWPE)共混体系中,并对其进行力学性能测试。结果表明:UHMWPE可有效改善MPU弹性体的减摩性;PU成功接枝到了LDPE上,且LDPE、低密度聚乙烯接枝丙烯酸(LDPE-g-AA)、LDPE-g-PU三者对水的静态接触角依次减小,LDPE-g-AA、LDPE-g-PU分别与MPU/UHMWPE制得的共混材料的力学性能有了很大提高,且LDPE-g-PU作为相容剂的效果最优。

The Low density polyethylene-g-polyurethane （LDPE-g-PU） was prepared through grafting and modifying LDPE by using the method of aqueous solution polymerization and in-situ polymerization. It was characterized by IR spectrum, contact angle and DSC. The LDPE-g-PU as compatibility was added into millable polyurethane/ultra high molecular weight polyethylene （MPU/UHMWPE） blend system, then the mechanical properties of blend system were tested. The results show that UHMWPE can effectively improve the anti-friction property of MPU, and PU is successfully grafted onto the surface of LDPE, the static contact angles to water of LDPE, LDPE-g-acrylic acid （AA）, and LDPE-g-PU reduce in turn. The mechanical properties of blend with compatibilizer were better than those of the blend without compatibilizer. The blend with LDPE-g-PU as compatilizer has the best mechanical properties.