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OALib Journal期刊
ISSN: 2333-9721
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β成核剂修饰多壁碳纳米管增强聚丙烯纳米复合材料的分散及结晶行为
DOI: 10.3724/SP.J.1105.2011.10358, PP. 1374-1381
Keywords: 多壁碳纳米管,β成核剂,聚丙烯,纳米复合材料,电学性能,等温结晶
Abstract:
利用非共价键改性方法,用芳香二羧酸酰胺类的β成核剂(β-NA)改性多壁碳纳米管(MWCNTs),采用溶液法制备了聚丙烯(PP)/β-NA-MWCNTs复合材料.通过广角X射线衍射(WAXD)分析了复合材料的结晶形态,结果表明β-NA-MWCNTs诱导聚丙烯生成大量β晶,同时提高了复合材料的结晶度.含5.0wt%β-NA-MWCNTs的纳米复合材料电导率达到4.00×10-3S/cm,与PP/MWCNTs、PP相比分别提高了3个和11个数量级,且渗透阈值从1.5wt%降为0.3wt%.β-NA非共价键修饰MWCNTs不但有效提高了MWCNTs在基体中的分散性,而且β-NA能够细化及均匀化晶区尺寸使得MWNCTs在基体中的网络结构更加完善,从而显著提高复合材料的电学性能.将PP/β-NA-MWCNTs复合材料等温结晶不同时间后,电导率出现先增加后减小的趋势,而且随着MWCNTs含量的增大,出现极值的时间减小,形成良好导电网络所需的晶体尺寸越小.在相同MWNCTs含量下,更高的结晶温度下出现极值的时间延长,达到相同的结晶度需要更长的时间.
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