中国塑料 ›› 2018, Vol. 32 ›› Issue (06): 59-64.DOI: 10.19491/j.issn.1001-9278.2018.06.009

• 材料与性能 • 上一篇    下一篇

材料组分对PP/PE-LD水发泡注塑件延展性能的影响

谭啸天,周应国,张竞   

  1. 江苏科技大学
  • 收稿日期:2017-11-17 修回日期:2018-01-01 出版日期:2018-06-26 发布日期:2018-07-31
  • 基金资助:
    中国大学生创新创业训练计划项目

Effect of Composition on Ductility of PP/PE-LD Water-foamed Injection-molded Parts

  • Received:2017-11-17 Revised:2018-01-01 Online:2018-06-26 Published:2018-07-31

摘要: 以水为发泡剂在常规注塑机中制得具有不同材料组分的聚丙烯(PP)/低密度聚乙烯(PE-LD)共混物微孔制件,并对该制件进行力学性能测试及微观结构表征。结果表明,微孔的存在能够提高PP/PE-LD材料的延展性能,而不同的PP/PE-LD组分对制件的微孔结构及力学性能均有较大影响;当PP含量为90 %~50 %(质量分数,下同)时,PP与PELD两相的相容性较差,导致PP/PE-LD共混物形成泡孔更加容易,微孔的分布更加均匀,从而其延展性更易提高。

Abstract: Compounding or blending is normally considered a good method to produce new polymeric materials for special uses. However, the ductility of polypropylene (PP)/low-density polyethylene (PE-LD) blends is relatively poor. PP/PE-LD microporous samples were prepared via conventional injection molding using water as a blowing agent, and their mechanical properties and microstructure were investigated. The results suggest that the formation of microporous structure enhanced the ductility of PP/PE-LD blends, and their mechanical properties and microstructure were influenced by the compositions of PP/PE-LD blends. A fine microporous structure was observed in the PP-content range of 90 %~50 %, which was attributed to the poor compatibility between the PP and PE-LD phases. This makes the ductility improved much easilier.