Influence of GMA grafted MWNTs on physical and rheological properties of PMMA-based nanocomposites by in situ polymerization

Abstract

In this study, multi-walled carbon nanotubes (MWNTs) reinforced poly(methyl methacrylate) (PMMA) nanocomposites were prepared by in situ polymerization. Glycidyl methacrylate (GMA) grafted MWNTs (GMAMWNTs) were used to improve the compatibility between the MWNTs and the PMMA matrix. The physical and rheological properties of the PMMA nanocomposites with different GMA-MWNT contents were examined. The GMA-MWNTs were embedded homogeneously into the PMMA matrix by in situ polymerization. A uniform dispersion of GMA-MWNTs produced nanocomposites with enhanced physical properties. The maximum tensile strength was observed with the 2.0 wt% GMA-MWNT loading, and was 41% higher than that of pure PMMA. In addition, the viscosity of the nanocomposites was increased gradually by the addition of GMA-MWNTs. The storage (G') and loss modulus (G'') were increased significantly by increasing the GMA-MWNT content, which was attributed to the strong interaction between highly dispersed GMA-MWNTs and PMMA matrix.

Preparation of End-Capped Hyperbranched Polyaniline@Carbon Nanotube Hybrids for High-k Composites with Extremely Low Percolation Threshold and Dielectric Loss

“…As shown in Figure 4, the characteristic D band (1322 cm −1 ) and G band (1589 cm −1 ) in the Raman spectrum of MWCNTs gradually broaden and the G band shifts toward 1583 cm −1 as the content of EHSiPA in the hybrid increases, indicating the formation of the EHSiPA layer on the surfaces of the MWCNTs. 14 On the basis of the above analyses, it is concluded that through the sp 2 hybridization the alternating benzenoid rings and N atoms along the PA segments in EHSiPA form a conjugated structure, which tends to produce π−π interactions with the π-banded surfaces of MWCNTs, while the multi-PA chains and flexible branched chains of EHSiPA make this tendency become true. It should be noted that a very small amount of EHSiPA can be stacked firmly onto the surfaces of MWCNTs.…”

Rheological Behavior of Amino-Functionalized Multi-Walled Carbon Nanotube/Polyacrylonitrile Concentrated Solutions and Crystal Structure of Composite Fibers

“…Chafidz et al [ 32 ] reported that the polypropylene-nanoclay composites prepared from masterbatch had sol-to-gel transition point, and indicated that the polymer macromolecular could not completely relax owing to the interfacial interaction between the nanoclay and polymer matrix. Besides, the value of G’ for the amino-CNT/PAN composite concentrated solutions are higher than those of PAN concentrated solutions in low frequency at the same temperature, suggesting that the network structure could be formed between the amino-CNTs and PAN macromolecular chains [ 25 , 41 , 42 ]. Moreover, it is consistent with the uniform dispersion of amino-CNTs leading to the higher storage modulus [ 43 , 44 ].…”

Tunable Mechanical, Electrical, and Thermal Properties of Polymer Nanocomposites through GMA Bridging at Interface

“…After polymerization, a substantial increase of approximately 80 °C in the thermal decomposition temperature of P-GMA-NGP ( T d = 342 °C) was observed than in that of P-NGP/S synthesized by the solution-mixing method (245 °C). Compared to P-NGP/S synthesized by the solution-mixing method, a remarkable increase in the thermal stability of P-GMA-NGP composite was observed due to the strong interfacial interaction between the polymer filler through the bridging of GMA chains, which hinders the decomposition. , Moreover, a higher residue of P-GMA-NGP at 600 °C can be attributed to earlier functionalization of NGPs, which plays an important role during the degradation of nanocomposite and leads to the formation of a thermally stable product and contributes to the residue formation in the end.…”