增韧高密度聚乙烯薄膜的结构与性能

Study on Structure and Properties of Toughened High Density Polyethylene Film

以线型低密度聚乙烯(LLDPE)、聚丙烯(PP)及高熔体质量流动速率聚丙烯(HMIPP)对高密度聚乙烯(HDPE)进行增韧改性,利用熔体质量流动速率、落标冲击强度、雾度、红外光谱、扫描电镜、X射线衍射测试等研究改性HDPE薄膜的熔融温度、力学性能和形貌结构。结果表明,10%PP/30%LLDPE/HDPE配比增韧效果最佳,抗冲击质量从50 g提高到70 g,雾度从30%下降到24%,结晶温度由原来135. 21℃降低到115℃,改性HDPE发生塑性变形,PP和LLDPE与HDPE发生了物理交联,增韧后的HDPE薄膜结晶度下降了8%,PP和LLDPE加入提高了HDPE薄膜韧性。

High density polyethylene(HDPE)was toughened by linear low density polyethylene(LLDPE),polypropylene(PP)and high melt index polypropylene(HMIPP).The melting temperature,mechanical properties and morphology structure of modified HDPE film were studied by testing the melt index,falling-dart impact strength,haze,infrared spectrum,scanning electron microscopy and X-ray diffraction.The results show that the toughening effect of 10%PP/30%LLDPE/HDPE mass ratio is the best,and the damage weight of the falling-dart impact increases from 50 g to 70 g.The haze decreases from 30%to 24%,the crystallization temperature reduces from 135.21℃to 115℃,and the modified HDPE occurs plastic deformation.PP and LLDPE with HDPE could occur physical crosslinking,the crystallinity of modified HDPE film decreases 8%,and the toughness of HDPE film with addition of PP and LLDPE could be improved.