文章摘要
碳纳米管在热塑性聚氨酯中的交替多层分布及退火处理对复合材料导电性能的影响
Influence of Alternating Multilayer Distribution of Carbon Nanotubes in Thermoplastic Urethane and Annealing Treatment on Conducting Properties
  
DOI:10.16865/j.cnki.1000-7555.2018.07.017
中文关键词: 聚氨酯  交替层状  导电性能  退火
英文关键词: thermoplastic urethane  alternating multilayer structure  conducting properties  annealing
基金项目:国家自然科学基金资助项目(51673136);高分子材料工程国家重点实验室优秀青年人才项目(sklpme2015-3-03)
作者单位
董仁琼,王晴雯,沈佳斌,郭少云 四川大学高分子研究所 高分子材料工程国家重点实验室,四川 成都 610065 
摘要点击次数: 11
全文下载次数: 
中文摘要:
      利用微层共挤出技术制备了不同层数的热塑性聚氨酯(TPU)和碳纳米管(CNT)填充TPU 交替多层复合材料,分别研究了层结构和退火处理对复合体系导电性能的影响。结果显示,在相同粒子填充量下(4%)、低层数(低于64层)样品的体积电阻率均小于TPU/CNT普通共混样,说明导电粒子在聚合物基体中的选择性多层分布更有利于相互搭接形成导电通路。但是,随着层数的增加,层叠作用逐渐破坏导电层中原本连续的粒子网络。当层数达到128层时,电阻率超过共混体系。对多层样品分别在40℃、60℃和80℃下退火1h,层数高的样品电阻的下降幅度更大,且退火温度越高,趋势越显著。分析认为,在高温下聚合物分子链更容易发生松弛回复,提高了导电粒子在基体中的搭接几率,使导电网络更易实现重构,这为多层体系电学相关性能的改善提供了新的途径。
英文摘要:
      Alternating multilayer composites consisting of neat thermoplastic urethane(TPU) layers and carbon nanotube (CNT)-filled TPU layers were prepared through microlayer coextrusion. The influence of layer structure and annealing treatment on the conducting properties of composites was investigated. By filling the same content of particles (4%), the volume resistivity of the specimens with low layer numbers (less than 64) is less than that of the TPU/CNT conventional composite. This indicates that the selective multilayer distribution of particles in polymeric matrix is more beneficial to construct conducting pathways. However, with increasing the layer numbers, the layer multiplication gradually destroys the particle network in conducting layers, so that the electrical resistivity of 128-layer specimen even exceeds that of the conventional composite. All multilayer specimens are annealed at 40 ℃, 60 ℃ and 80 ℃ for 1h, respectively. The results exhibit that the resistance of the specimen with more layers is dramatically decreased and this tendency could be promoted when annealed at higher temperature. It is considered that high temperature could be easier to trigger the relaxation of macromolecular chains, which increase the opportunity of the connection between conducting particles leading to the re-construction of conducting network. This method provides one of feasible ways to improve the electrical related properties of the multilayer composites.
查看全文   查看/发表评论  下载PDF阅读器
关闭