中国塑料 ›› 2009, Vol. 23 ›› Issue (01): 51-54 .DOI: 10.19491/j.issn.1001-9278.2009.01.011

• 材料与性能 • 上一篇    下一篇

紫外照射下聚丙烯结晶结构变化和耐老化性能研究

王丹灵,钱 欣   

  1. 浙江工业大学化学工程与材料学院,浙江 杭州 310014
  • 收稿日期:2008-09-08 修回日期:1900-01-01 出版日期:2009-01-26 发布日期:2009-01-26

Study on Crystal Structure Transformation and Aging Resistance of Polypropylene Induced by UV light

WANG Dan-ling, QIAN Xin   

  1. College of Chemical Engineering and Materials Science , Zhejiang University of Technology, Hangzhou 310014, China
  • Received:2008-09-08 Revised:1900-01-01 Online:2009-01-26 Published:2009-01-26
  • Contact: QIAN Xin

摘要: 研究了添加α成核剂的聚丙烯(α-PP)、β成核剂的聚丙烯(β-PP)和纯PP三种材料在紫外辐射下的聚集态结构变化情况。结果表明:与其他两种PP相比,β-PP具有较高的抗光降解能力;三种PP在紫外光辐射初期结晶度都有所提高,其中β-PP在312 h结晶度达到最大值65.6 %,α-PP在辐射456 h达到最大值74.6 %。但随着辐射时间的继续增加,结晶度都呈下降趋势;β-PP中的β相结晶度先增后减,在144 h达到最大结晶度30.9 %,α相结晶度先减后增,到312 h后基本保持不变,保持在48 %左右。

关键词: 聚丙烯, α晶, β晶, 光降解, 晶型转变

Abstract: The effects of UV irradiation on the morphology and surface structure of α-nucleated PP(α-PP), β-nucleated PP(β-PP), and neat PP were studied. Lower degradability was found in β-PP as compared with α-PP and neat PP. The gross degree of crystallinity of all samples showed an initial increase in on short-time exposure followed by decrease with prolonged exposure. The maximum degree of crystallinity for β-PP was 65.5% at 312h and for α-PP was 74.6% at 456h. The β-phase in β-PP reached a maximum of 30.9% at 144h exposure, followed by a decrease with prolonged exposure. The α-phase in β-PP increased after short-time and then decreased, leveling off to 48% after 312h exposure.

Key words: polypropylene, α-crystal, β-crystal, photo degradation, crystal transformation