文章摘要
拉伸速率对β-iPP薄膜微观结构和力学性能的影响
Effect of Stretching Rates on Microstructure and Tensile Properties of β-iPP Films
  
DOI:10.16865/j.cnki.1000-7555.2018.08.010
中文关键词: 等规聚丙烯  β-iPP薄膜  微观结构  力学性能
英文关键词: isotactic polypropylene  β-iPP film  microstructure  mechanical properties
基金项目:国家自然科学基金资助项目(51173171,21671205)
作者单位
刘忠柱1, 秦 琦1, 李睢水2, 郑国强2, 米立伟1 1. 中原工学院 材料与化工学院河南 郑州 450007 2. 郑州大学 材料科学与工程学院河南 郑州 450001 
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中文摘要:
      通过熔体挤出-拉伸法制备了一系列稀土类β成核剂改性等规聚丙烯(iPP)薄膜。考察了拉伸速率对β-iPP薄膜微观结构和力学性能的影响。结果表明,所有β-iPP薄膜中α晶和β晶均发生支化现象,并且β晶支化随着拉伸速率的增加而受到抑制,而α晶支化没有发生明显变化;β-iPP薄膜的分子链和片晶的取向度随着拉伸速率增加而增大,而β晶含量及其结晶度呈现相反的趋势。另外,拉伸测试结果表明,当拉伸速率为30 cm/min,β-iPP薄膜的拉伸强度和韧性达到最大值。
英文摘要:
      A series of β-nucleating agent modified iPP (β-iPP) films were prepared by melt extrusion-stretching. The effect of stretching rates (SR) on microstructure and tensile properties of β-iPP films was investigated in detail. The results show that there is lamellar branching of α- and β-crystal in all films prepared at different SR, and the lamellar branching of β-crystal is inhibited with increasing SR, however the lamellar branching of α-crystal has no significant change; the chain and lamellar orientation degree of β-iPP films increase with increasing SR, but the relative content of β-crystal and its crystallinity exhibits opposite tendency. In addition, tensile test indicates that, when the SR is 30 cm/min, the tensile strength and toughness of β-iPP films reach the maximum.
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