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首页> 外文期刊>Journal of Applied Polymer Science >Multiwalled carbon nanotube polymer composites: Synthesis and characterization of thin films
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Multiwalled carbon nanotube polymer composites: Synthesis and characterization of thin films

机译：多壁碳纳米管聚合物复合材料：薄膜的合成与表征

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The aim of this article was to elucidate the basic relationships between processing conditions and the mechanical and electrical properties of multiwalled carbon nanotube reinforced polymer composites. In conventional chopped fiber reinforced polymer composites, uniform distributions of fibers throughout the matrix are critical to producing materials with superior physical properties. Previous methods have dispersed carbon nanotubes by aggressive chemical modification of the nanotubes or by the use of a surfactant prior to dispersion.(1,2) Here, ultrasonic energy was used to uniformly disperse multiwalled nanotubes (MWNTs) in solutions and to incorporate them into composites without chemical pretreatment. Polystyrene (PS) solutions containing MWNTs were cast and spun to yield thin film MWNT composites, The rheology of PS/MWNT suspensions was modeled using the Carreau equation. MWNTs were found to align at the shear rates generated by the spin casting process. The tensile modulus and strain to failure of samples compared well to classical micromechanical models, increasing with MWNT loading. The composite films showed lower strains at the yield stress than neat PS films. The presence of MWNTs at 2.5 vol % fraction approximately doubles the tensile modulus, and transforms the film from insulating to conductive (surface resistivity, rho, approaching 10(3) Omega/square). (C) 2002 Wiley Periodicals, Inc. [References: 26]
机译：本文的目的是阐明加工条件与多壁碳纳米管增强聚合物复合材料的机械和电气性能之间的基本关系。在常规的短切纤维增强聚合物复合材料中，纤维在整个基质中的均匀分布对于生产具有优异物理性能的材料至关重要。以前的方法是通过对碳纳米管进行积极的化学改性或在分散之前使用表面活性剂来分散碳纳米管。（1,2）在此，超声能量用于将多壁纳米管（MWNT）均匀分散在溶液中并将其掺入溶液中无需化学预处理的复合材料。浇铸并纺丝含有MWNTs的聚苯乙烯（PS）溶液，得到薄膜MWNT复合材料。使用Carreau方程对PS / MWNT悬浮液的流变学进行建模。发现MWNT以旋转铸造工艺产生的剪切速率排列。与经典的微机械模型相比，样品的拉伸模量和破坏应变要好，随MWNT载荷的增加而增加。复合膜在屈服应力下的应变比纯PS膜低。 MWNT的含量为2.5％（体积）大约会使拉伸模量加倍，并使薄膜从绝缘转变为导电（表面电阻率，rho，接近10（3）Ω/平方）。 （C）2002 Wiley Periodicals，Inc. [参考：26]

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