tailieunhanh - Improving mechanical properties of multiwalled carbon nanotube/epoxy composites through a simple stretch-drawing method

In this study, a new simple stretch-drawing method was used to modify the structures of the aligned CNT sheets for improving the composite properties. The stretch-drawing of the CNT sheets enhanced the composite properties considerably. The improved properties of the composites originated from straightening of the wavy CNTs and increasing the CNT dense packing in the composites. | TAÏP CHÍ PHAÙT TRIEÅN KH&CN, TAÄP 19, SOÁ K7- 2016 Improving mechanical properties of multiwalled carbon nanotube/epoxy composites through a simple stretch-drawing method Tran Huu Nam Vu Minh Hung Pham Hong Quang Petrovietnam University (Manuscript Received on July 13th, 2016, Manuscript Revised December 06th, 2016) ABSTRACT Horizontally aligned multi-walled carbon nanotube (CNT) sheets were produced from from straightening of the wavy CNTs and increasing the CNT dense packing in the vertically aligned CNT arrays using drawing and composites. With a 3% stretch ratio, the aligned winding techniques. Composites based on epoxy resin and an aligned 100-ply CNT sheet have CNT/epoxy composites achieved their best mechanical properties in this study. The 3% been developed using hot-melt prepreg processing. However, wavy and poor-packed stretched composites exhibit increased tensile strength by 113% and enhanced elastic modulus CNTs in the sheets have limited reinforcement by 34% compared to non-stretched ones. Results efficiency of the CNTs in the composites. In this study, a new simple stretch-drawing method was show that the simple stretch-drawing is effective to produce highly aligned CNT sheets for the used to modify the structures of the aligned CNT sheets for improving the composite properties. development of high-performance CNT composites. Compared to our previous stretching The stretch-drawing of the CNT sheets enhanced the composite properties considerably. The method, the stretch-drawing method in this study is more effective in improving the mechanical improved properties of the composites originated properties of aligned CNT/epoxy composites. Key words: carbon nanotubes, prepregs, composites, stretching, mechanical properties. composites could not fully take advantage of the 1. INTRODUCTION Carbon nanotubes (CNTs) have been regarded as the reinforcing agents for polymer composites because of their high aspect ratio, high .