超強(qiáng)超韌輕質(zhì)的石墨烯-碳納米管復(fù)合纖維(英文)課件

1、Reading ReportSpider silk-SpidermanNature, 2001, 410, 541.Strong, tough, lightweight polymer fibers are of great interest for various applications: ranging from composites for airplanes, vehicles to bulletproof vests. Fiber toughness is dramatically affected by microstructure, Microstructure design

2、is an important area of textile research. IntroductionSchematic structures of various fibers. With decreasing disorder and defect density, the fiber strength increases (left to right). CNT& Graphene: The extraordinary properties of graphene and CNT motivate the development of methods for producing c

3、ontinuous, strong, tough fibres. Science 290, 13311334 (2000) Super-tough carbon-nanotube fibresDalton et al, Nature, 2003, 423,703 ExperimentPreparation of the RGOF and SWNT (SDBS)/water dispersion (0.3 wt%);RGOF/SWNT dispersion injected (24 ml h-1) into PVA coagulation bath rotating at 10 r.p.m. C

4、ontinuous and uniform RGOF/SWNT/PVA hybrid fibers were thereby fabricated. Fibers were washed, dried, soaked in methanol for 12 h to increase PVA crystallinity.Materials: RGOFs dispersed in DMF (0.5 g ml-1),SWNT(1.3-1.5 nm). SDBS, methanol and PVA (Mw146k-186k; hydrolysis 99%)Preparation of fibers.

5、Schematic of the rotating bath used for coagulating RGOF/SWNTs into a fiberStressstrain curves of hybrid (RGOF /SWNT 1:1, red line), SWNT/PVA (green line) and RGOF /PVA (blue line) composite fbres. (b) Elastic modulus (circles), tensile strength (squares) and toughness (c) with G fraction(d) Compari

6、son of toughness of prior-art materialsMechanical properties of composite fibresCarbon nanomaterials &polymer chain alignment in fibres Alignment of carbon nanomaterials and polymer chains in polymer composite fibres (a) Raman intensity ratio for polarization parallel and perpendicular to the fibre

7、axis as a function of wt.% of RGOF. (b) Diffraction intensities at Q = 1.4 1 (scattering wave vector corresponding to the diffraction from PVA chains )versus fibre orientation angle for hybrid fibres before (red line) and after (blue line) tensile tests Carbon nanomaterials and polymer chain alignme

8、nt in fibres This fact is explained by strong interactions between the two types of carbon nanoparticles, which provide their mutual self-alignment during solution spinning, thereby creating the fibre microstructure believed to be responsible for dramatically enhanced toughness.Toughening mechanisms for hybrid fibres (a) Picture illustrating crack deflection by a RGOF in a hybrid fibre. (b, c) Illustrations showing plastic deformation of the PVA matrix during tensile elongation: (b) partially aligned RGOFs and CNTs in