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Study on Mechanical Properties of Double-walled Carbon Nanotube Macrostructures and Relative Composites

Author: LiYiJun
Tutor: WangKunLin
School: Tsinghua University
Course: Materials Science and Engineering
Keywords: DWNTs Mechanical Properties Composites Interfacial bonding Raman spectroscopy
CLC: TB383.1
Type: Master's thesis
Year: 2005
Downloads: 289
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Abstract


Theoretical and experimental studies show that carbon nanotubes have excellent mechanical properties, it has broad application prospects in structural materials and composites reinforced phase. The DWNTs between single-walled and multi-walled carbon nanotubes between a one-dimensional materials, but there is still no experimental data on its mechanical properties. The papers in the synthesis of double-walled carbon nanotube filaments and films based on the study of the mechanical properties of the macro body, and its one-dimensional to three-dimensional mechanical properties of the composite polymer matrix to expand the system. Xylene as the carbon source, synthetic filament average of the order of up to 10 cm in length, bundle continuity and orientation compared with good DWNTs filament, its tensile tests found floating catalyst method tensile strength and elastic modulus of 1.2 GPa and 16 GPa respectively, the portion of the actual from the bearing the role of double-walled carbon nanotube bundles, the average tensile strength and elastic modulus of 6 GPa and 80 GPa, respectively, specific strength and specific modulus up to 4.9 GPa and 56 GPa, indicating that the filament has excellent mechanical properties. The solution blending method, the DWNTs filaments and the film was soaked in the epoxy resin / acetone solution prepared composite fibers and films, composite mechanical properties substantially with the soaking solution concentration decreases improve. Concentration of 10 vol%, the average fiber tensile strength and elastic modulus were higher than the original filament 25% and 69%, the composite film increased 4.4 times and 3.3 times respectively compared with the original film, the polymer from transfer loads to each part of the composite carbon nanotube bundles the stress more evenly. 2 wt% of the content of double-walled carbon nanotube thin film, prepared by melt blending the epoxy grassroots shaped composite block body average compression strength and modulus than the base body, respectively, increased by 49% and 18%, the tensile intensity decreased slightly. The study found that the polymer matrix of the different elongation of the reinforcing effect of the double-walled carbon nanotube filaments are not the same elongation and filament closer epoxy enhancing effect on the mechanical properties of the filaments is superior to the more brittle polystyrene. In addition, the form of double-walled carbon nanotube bundles on the mechanical properties of the composites influential bundle shorter poor directional poor mechanical properties of composites. Raman spectroscopy, double-walled carbon nanotubes composite tensile and compressive D ~ * peak to the low-band and high-band offset, respectively, indicating that the loads can be effectively passed from the polymer matrix by the interfacial shear force to carbon nanotubes on. The same time, peak shape changes, D ~ * peak sample by tension and compression tilt to the low-band and high-band, respectively, indicating that the peak position offset to * peak symmetry can also be used as characterization of carbon nanotubes stress state in which an adjunct.

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