中国塑料 ›› 2007, Vol. 21 ›› Issue (1): 52-58.

• 材料与性能 • 上一篇    下一篇

时间扫描研究低剪切条件下PP/PS合金材料的静态流变特征

李景庆,田晓明,盛京*   

  1. 天津大学材料科学与工程学院,天津300072
  • 出版日期:2007-01-26 发布日期:2021-03-03
  • 基金资助:
    国家自然科学基金资助项目(50390090)

Investigations on the Static Rheological Behaviors of PP/PS Alloys by Time Sweep Method at Lower Shear Rates

LI Jing-qing,TIAN Xiao-wing,SHENG Jing*   

  1. School of Materials Science&Engineering, Tianjin University, Tianjin 300072, China
  • Online:2007-01-26 Published:2021-03-03

摘要: 选用典型的不相容体系聚丙烯/聚苯乙烯(PP/PS)合金材料为研究对象,采用时间扫描的方式讨论了合金在恒定温度和剪切速率条件下的静态流变特征,结果表明:PP和PS作为均相纯聚合物,在时间扫描过程中,其豁度均随时间呈线性下降趋势,该现象可归结为材料的热氧降解作用。对非相容PP/PS合金材料进行时间扫描发现,扫描过程中豁度先升高后下降,可分为前期和后期两个阶段,前期相结构在剪切力传递过程中导致合金材料的载度相对较低,甚至低于连续相纯聚丙烯的赫度,具有明显的瞬态作用特征,时间扫描后期因相结构在稳定剪切条件下引起能量损耗而呈现较高的茹度,但因热氧作用整体趋于下降。

关键词: 高分子合金材料, 静态流变行为, 时间扫描, 聚丙烯, 聚苯乙烯

Abstract: Time sweep investigation ofthe static rheological behaviors of polypropylene(PP), polystyrene(PS)and their blends were carried out at low shear rates. The viscosity of neat PP and PS decreased linearly with time mainly due to thermal degradation. For the PP/PS alloy, the viscosity in-creased first and subsequently decreased. The first increase of the viscosity could be attributed to the in-terlockofthe phase structure and the later decrease was for the same reason of the homopolymers.

Key words: polymer alloy, static rheological behavior, time sweep, polypropylene, polystyrene

中图分类号: