Polyhedral oligomeric silsesquioxanes/carbon nanotube/carbon fiber multiscale composite: Influence of a novel hierarchical reinforcement on the interfacial properties

A facile approach to the synthesis of multi-walled carbon nanotube-polyhedral oligomeric silsesquioxane (POSS) nanohybrids

“…The Incorporation of a small amount of POSS-MWCNT hybrid into an epoxy polymer was found to improve the thermal properties of neat polymer [6]. The grafting of POSS-CNT onto carbon fiber (CF) surface and the interfacial properties between CF and epoxy matrix was also studied [7,8]. Significant improvements in the shear strength, storage modulus, impact toughness and service temperature were reported.…”

“…Recently, the functionalization of MWCNTs with POSS reagents has been found to significantly improve the mechanical, thermal and electrical properties of MWCNT-polymer nanocomposites [4][5][6][7][8]. Li et al [4] reported an improved dispersion of MWCNTs throughout a poly(L-lactide) polymer after POSS-treatment of nanotubes, resulting in a higher tensile modulus, yield strength and electromagnetic interference shielding effectiveness.…”

Polythiophene Grafted onto Single‐Wall Carbon Nanotubes through Oligo(ethylene oxide) Linkages for Supercapacitor Devices with Enhanced Electrochemical Performance

“…The SWCNTs-COOH shows peaks around 3403 cm À 1 (OH stretching), 1730 cm À 1 (C=O stretching) and 1384 cm À 1 (CÀ O stretching vibration) of the characteristic carboxylic acid groups, as well as strong bands at 2923 cm À 1 (CÀ H stretching) and 1576 cm À 1 (CÀ C vibrations from carbon skeleton). [31][32] Upon treatment with thionyl chloride, the OH stretching vibration at 3424 cm À 1 in SWCNTs-COOH becomes sharp and the C=O stretching vibration becomes obscured by the appearance of a stronger absorption at 1703 cm À 1 that can be attributed to the negative inductive effect of the chlorine atom in À COCl group, [33] which results in vacancy defects in carbon nanotubes. The FTIR spectrum of the PD2ET sample indicates characteristic peaks at 1636 and 1522 cm À 1 corresponding to υ(C α =C β ) vibration of quinoid unit of the polymer chain, [34] and the band at 1346 cm À 1 can be ascribed to the C β À C β ring stretching.…”

Study of the graphitic reinforcement of hierarchical epoxy matrix composites

“…Specifically, the deposition of CNT-COOH on sized CFs by an aqueous suspension immersion method resulted in 13% improvements in the ILSS of CF-CNT/epoxy composites [91]. The use of POSS in hierarchical CF-POSS-CNT reinforcements led to a 32-36% enhancement in the ILSS as well as to a 33% improvement of the impact toughness of the hierarchical laminates [104] [106]. A more notable enhancement was observed in the ILSS of CF-CNT/polyester composites (44.5%) and CF-CNT/methyl phenyl silicone composites (53.1%), where PACl and APS, respectively, were used as the coupling agents for the preparation of the CF-CNT reinforcements [100,102].…”

“…The hierarchical approach was proposed by several authors as a biomimetic approach towards multiscale reinforcements with improved wettability [102,106,118], increased adhesion [4,46,97,124,126,143], more robust mechanical interlocking [88,[97][98][99][100]106,119,128] and enhanced interfacial stress transfer [47,49,120,50,52,66,69,[73][74][75][76] due to the emergence of additional energy dissipation mechanisms related to the CNTs.…”