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The dispersion level of carbon nanotubes (CNTs) and interface design are two of the most crucial roles in developing the superior mechanical performance of polymer/CNT nanocomposites. In this work, a series of azide-terminated poly(glycidyl methacrylate)-block-poly(hexyl methacrylate) (PGMA-b-PHMA) copolymers with different PHMA chain lengths and s...
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... resin (diglycidyl ether of bisphenol-A based E-51 epoxy with an epoxide equivalent weight of 192) was purchased from Shanghai Resin Factory Co., China. The qualitative characteristics of epoxy resin are presented in Table 1. The hardener was composed of the methyl-hexahydro phthalic anhydride (MHHPA) and benzyl dimethylamine catalyst (BDA), with a weight ratio of 40:1. ...Context 2
... there is a smaller decrease in a function of molecular weights of PHMA, in the case of modulus compared to strength. The fracture toughness values (KIC and GIC) of the neat epoxy and its composites with 0.05 wt% different fillers are listed in Table 1. For the given specimen geometry, Poisson's ratio ( í µí¼) of the neat epoxy (i.e., 0.35 [ 36 ]) is used to determine the value of KIC. ...Context 3
... composites with 0.05 wt% B2@fMWNTs exhibit maximum toughening effects, for which KIC and GIC increase by 46% and 92.6% The fracture toughness values (K IC and G IC ) of the neat epoxy and its composites with 0.05 wt% different fillers are listed in Table 1. For the given specimen geometry, Poisson's ratio ( ν) of the neat epoxy (i.e., 0.35 [36]) is used to determine the value of K IC . ...Citations
... The FT-IR spectra after mixed acid hot stirring and mixed acid ultrasound, in Fig. 4(a), show that the -OH and -COOH content of B MWNTs is higher than that of A MWNTs . These results show the initial and lead to the truncation in regions with higher curvature, thereby reducing the aspect ratio of the MWNTs [30,31]. At the same time, oxygen-containing groups are introduced into the carbon ring at the wall and fractures of MWNTs, which improves the dispersibility of MWNTs in organic solvents and polar polymers [32]. ...
In this work, a series of functionalized MWNTs/EP composites were fabricated by epoxy resins (EP) and functionalized multi-walled carbon nanotubes (MWNTs). The dispersion of MWNTs in the EP matrix, through different methods, i.e., stirring, solvent, and emulsion dispersion, was investigated. Results show that the homogeneous dispersion of the MWNTs/EP composites was achieved, and the glass transition temperature (Tg) increased to 119℃. The tensile strength and modulus of elasticity were 1.690 GPa and 62.5 MPa, respectively, and the impact strength reached 4.97 KJ/m² for the MWNTs/EP, with a 6 wt% MWNT loading. In addition, the resistivity of the MWNTs/EP composites decreased from 10¹³ to 10⁶ Ω·cm in the initial EP matrix. The incorporation of MWNTs and a novel dispersion method effectively modified the mechanical and electrical properties of the initial EP matrix, and improved the inherent structural defects of the initial EP matrix, reducing the brittleness and impact resistance. With further research, this composite material has the potential to further broaden the application field of novel materials based on the EP matrix.
... The main purpose of that was to improve the degree of dispersion and achieve good alignment between nanotubes and matrix. In conclusion, the researchers reported an improvement in the tensile strength, thermomechanical properties, fatigue properties, wear resistance, interlaminar shear strength properties, and interlaminar fracture toughness of hybrid polymer composites because of the improved degree of dispersion [17][18][19][20][21]. ...
... This is because the addition of the BYK dispersant can promote the dispersion of nanotubes in the epoxy resins and hence reinforce the adhesion between MWCNT and epoxy resins in the nanocomposites. Therefore, more improvements in transfer loads or in energy dissipation between nanotubes and matrix are expected due to increased contact areas [12,18]. This shows that the addition of BYK to nanophase resin could increase the flexural strength properties of nanocomposites. ...
