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Mechanical and Electrical Properties of Injection Molded Polymer Matrix Carbon Nanotube Composites

注塑聚合物基碳纳米管复合材料的机械和电性能

基本信息

批准号：
16360362
负责人：
OHTAKE Naoto
金额：
$ 7.17万
依托单位：
Nagoya University (2006)Tokyo Institute of Technology (2004-2005)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Carbon nanotubes (CNTs) are expected to be one of the most promising nano-materials for improving mechanical properties as well as electrical properties of polymer matrix composites. However, since the size of CNTs is on the nanometer order, there are little reports about the experimental evaluation of their properties by direct manipulation, which is performed in a scanning electron microscope (SEM), an atomic force microscope (AFM). In the material design for using nano-materials, it is essential to understand the characteristics of nano-materials experimentally. We attempted to measure Young's modulus of various types of CNTs. A cantilever, which is usually used for an AFM and made of silicon, was mounted on the piezo-driving stage. The apparent Young's modulus of the CNT is calculated from the conventional relationship between the load applied to the CNT and the displacement of the tip of the CNT. Five types of CNTs are used in the series of experiments. They are ARC-CNTs, CVD-CNTs … More , two types of Vapor-grown CNTs (VGCNTs); named VG80 and VG50, which are 80nm and 50nm in average diameters, respectively. The relative intensities ratio of the D-band around 1350 cm^<-1> to the G-band around 1580 cm^<-1>(ID/IG) in Raman spectra was obtained using the Gaussian fitting. An ARC-CNT was bent like a bending beam by a lateral force applied by a tip of the cantilever. For calculating the apparent Young's modulus of CNT, an equation for the conventional bending beam was applied. Since Young's modulus actually calculated includes the influence of the section modulus and indicates the flexural rigidity, it was termed "apparent Young's modulus". The apparent Young's modulus of the ARC-CNT used here was obtained as 3.3 TPa. This value is slightly lower than the theoretical Young's modulus (5.5 TPa) of the single-walled CNT, which was simulated using molecular dynamics. The same measurements and calculation were performed on other CNTs, and the relationship between the apparent Young's modulus obtained from TEM measurements and the ID/IG obtained from the Raman spectra is summarized. The result clearly shows that the high-crystallinity CNT has a high apparent Young's modulus.Next, we studied injection molding of MWCNT filled polystyrene (PS) and evaluation of the mechanical and electrical properties comparing with the composites in which conventional carbon fillers were filled. As a result, the resistivity of the composites filled with CNT drops significantly between 3 and 4 vol.% and after which it decreases linearly above 4 vol.%. The resistivity of the composites filled with CNT is 1.2x10^2 W・cm when the CNT concentration is 11.6 vol.%. The resistivity is significantly lower than that of the composites which were filled with conventional carbon fillers. The elastic modulus slightly improves with increasing CNT concentration The tensile strength is almost constant in the pristine CNT concentration range from 0 to 12 vol.%. Then we applied DLC coating and amino-functionalization of CNTs and found that the tensile strength increases up to 20% using the functionalized CNTs in PP matrix. Less

碳纳米管（CNTs）有望成为改善聚合物基复合材料力学性能和电学性能的最有前途的纳米材料之一。然而，由于碳纳米管的尺寸是纳米级的，有很少的报告，通过直接操作，这是在扫描电子显微镜（SEM），原子力显微镜（AFM）进行的实验评价其性能。在使用纳米材料的材料设计中，必须通过实验了解纳米材料的特性。我们试图测量各种类型的CNT的杨氏模量。悬臂梁，这是通常用于原子力显微镜和硅制成，安装在压电驱动平台。CNT的表观杨氏模量由施加到CNT的载荷与CNT尖端的位移之间的常规关系计算。五种类型的碳纳米管被用于在一系列的实验。它们是ARC碳纳米管，CVD碳纳米管 ...更多信息气相生长碳纳米管（VGCNTs）有两种，分别命名为VG 80和VG 50，平均直径分别为80 nm和50 nm。使用高斯拟合获得拉曼光谱中1350 cm-1附近的D带<-1>与1580 cm-1附近的G带的相对强度比<-1>（ID/IG）。通过由悬臂的尖端施加的横向力，ARC-CNT像弯曲梁一样弯曲。为了计算CNT的表观杨氏模量，应用常规弯曲梁的方程。由于实际计算的杨氏模量包括截面模量的影响并表示弯曲刚度，因此将其称为“表观杨氏模量”。这里使用的ARC-CNT的表观杨氏模量为3.3TPa。该值略低于使用分子动力学模拟的单壁CNT的理论杨氏模量（5.5TPa）。对其他CNT进行了相同的测量和计算，并总结了从TEM测量获得的表观杨氏模量与从拉曼光谱获得的ID/IG之间的关系。结果清楚地表明，高结晶度的碳纳米管具有高的表观杨氏模量。接下来，我们研究了多壁碳纳米管填充聚苯乙烯（PS）的注塑成型，并与填充常规碳填料的复合材料进行了力学和电学性能的比较。结果，填充有CNT的复合材料的电阻率在3体积%和4体积%之间显著下降。然后线性下降到4体积%以上。当CNT含量为11.6vol. %时，复合材料的电阻率为1.2 × 10^2W·cm。电阻率明显低于填充有常规碳填料的复合材料。随着CNT浓度的增加，弹性模量略有提高。拉伸强度在0至12体积%的原始CNT浓度范围内几乎恒定。然后，我们应用DLC涂层和氨基功能化的碳纳米管，发现拉伸强度增加了20%，使用功能化的碳纳米管在PP基体。少

项目成果

期刊论文数量（30）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

CNTへのアモルファス炭素膜合成およびそのCNT複合材料としての機械的特性評価

碳纳米管上非晶碳薄膜的合成及其作为碳纳米管复合材料的力学性能评价

DOI：
发表时间：
2006
期刊：
第20回ダイヤモンドシンポジウム講演要旨集 1
影响因子：
0
作者：
林芳広;相原広忠;安原鋭幸;村上碩哉;大竹尚登
通讯作者：
大竹尚登

TEMマニピュレーションによるDLC被覆したカーボンナノチューブの機械的性質の評価

通过 TEM 操作评估 DLC 涂层碳纳米管的机械性能

DOI：
发表时间：
2006
期刊：
第67回応用物理学会学術講演会講演予稿集 2
影响因子：
0
作者：
葛巻徹;相原宏忠;大竹尚登;光田好孝
通讯作者：
光田好孝

カーボンナノチューブのナノダイナミクス

碳纳米管的纳米动力学

DOI：
发表时间：
2005
期刊：
第54回理論応用力学講演会講演論文集
影响因子：
0
作者：
北方慎太郎;葛巻徹;光田好孝;榎本和城;大竹尚登
通讯作者：
大竹尚登

Measurement of Young’s modulus of carbon nanotubes by nanoprobe manipulation in a transmission electron microscope

DOI：
10.1063/1.2195010
发表时间：
2006-04
期刊：
Applied Physics Letters
影响因子：
4
作者：
Kazuki Enomoto;Shintaro Kitakata;T. Yasuhara;N. Ohtake;T. Kuzumaki;Y. Mitsuda
通讯作者：
Kazuki Enomoto;Shintaro Kitakata;T. Yasuhara;N. Ohtake;T. Kuzumaki;Y. Mitsuda

樹脂基CNT複合材料の表面導電性に及ぼす射出成形条件の影響

注射成型条件对树脂基碳纳米管复合材料表面电导率的影响