文献类型：期刊文献

中文题名：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

英文题名：DISPERSION AND CRYSTALLIZATION BEHAVIOR OF POLYPROPYLENE NANCOMPOSITES WITH β NUCLEATING AGENT MODIFIED MULTIWALL CARBON NANOTUBES

作者：张玲[1];胡斌[1];李春忠[1]

机构：[1]华东理工大学超细材料制备与应用教育部重点实验室,上海200237

年份：2011

卷号：21

期号：12

起止页码：1374

中文期刊名：高分子学报

外文期刊名：Acta Polymerica Sinica

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000299018300003)】；北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金(基金号20925621;50703009);上海市基础研究重点项目(项目号10JC1403600);上海市科委纳米专项(项目号0952nm02000);上海市重点实验室专项(项目号09DZ2202000);上海市曙光学者计划(项目号10SG31);中央高校基本科研业务费专项资金(项目号WD0914022)资助项目

语种：中文

中文关键词：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

外文关键词：MWCNTs; β Nucleating agent（β-NA）; Nanocomposites; Electrical conductivity; Isothermal crystallization

摘要：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5.0 wt%β-NA-MWCNTs的纳米复合材料电导率达到4.00×10-3 S/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1.5 wt%降为0.3 wt%.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.
Non-colavent modification of multiwall carbon nanotubes（MWCNTs） by arylamides compound β-nucleating agent（β-NA） through π-π interaction was found to improve the dispersion of MWCNTs in the polypropylene（PP） matrix,increase the crystallinity of PP,decrease the crystal size,and increase the electrical conductivity of their composites.The morphology,crystallization behavior and the electrical conductivity of the nanocomposites were investigated by field emission scanning electron microscopy（FESEM）,wide-angle X-ray diffraction（WAXD） and properties test.The characterizaiton of β-NA-MWCNTs showed that β-NA was successfully adsorbed on the surfaces of MWCNTs.The incorporation of β-NA-MWCNTs results in the formation of rich β-form crystals for PP,higher crystallinity and smaller crystalline sizes.FESEM observation showed that homogeneous compact network structure of β-NA-MWCNTs was obtained due to the smaller and more uniform crystalline region.Consequently,the PP/β-NA-MWCNTs nanocomposites possess a high electrical conductivity and a low percolation threshold of 0.3 wt% β-NA-MWCNTs,which is associated with the homogeneous compact network structure of β-NA-MWCNTs.The electrical conductivity of PP/β-NA-MWCNTs（5 wt%） was up to 4.0×10-3 S/cm,which was 3 and 11 orders higher than that of PP/MWCNTs and PP,respectively.The effect of the crystalline size on the electrical conductivity of the nanocomposites was studied by isothermal crystallization method.The electrical conductivity of PP/β-NA-MWCNTs was increased at first and then decreased with increasing time of isothermal crystallization.And the more MWCNTs added,earlier the maximum conductivity of PP/β-NA-MWCNTs appeared.At the same content of MWCNTs,the isothermal time for the maximum conductivity at 140℃ was longer than that at 130℃.The results imply that high electrical conductivity with optimal MWCNTs network structure can be obtained by controlling the crystallization conditions.