Influence of nanometric silicon carbide on phenolic resin composites properties

Abstract

This paper presents a preliminary study on obtaining and characterization of phenolic resin-based composites modified with nanometric silicon carbide. The nanocomposites were prepared by incorporating nanometric silicon carbide (nSiC) into phenolic resin at 0.5, 1 and 2 wt% contents using ultrasonication to ensure uniform dispersion of the nanopowder, followed by heat curing of the phenolic-based materials at controlled temperature profile up to 120 • C. The obtained nanocomposites were characterized by FTIR spectroscopy and scanning electron microscopy analysis and evaluated in terms of mechanical, tribological and thermal stability under load. The results highlight the positive effect of the nanometric silicon carbide addition in phenolic resin on mechanical, thermo-mechanical and tribological performance, improving their strength, stiffness and abrasive properties. The best results were obtained for 1 wt% nSiC, proving that this value is the optimum nanometric silicon carbide content. The results indicate that these materials could be effectively used to obtain ablative or carbon-carbon composites in future studies.

Fabrication and characterization of eco‐friendly human‐hair derived porous carbon‐filled carbon fabric‐reinforced polymer composites

“…There is a loss of formaldehude when PR and CPCs are cured by heating them at specific temperature. This can be identified in the corresponding FT-IR spectra, which shows that the diminishing of absorption peak (1,023 cm −1 ) associated with ether linkage (-CH 2 -O-CH 2 -) of PR in CPC appears and the peak shifting of C-O bond from 1,058 (PR) to 1,060 cm −1 (CPCs) due to bond stretching is also noticed [43,44]. The methylene linkage (-CH 2 -) of PR appears at 2,873-2,973 cm −1 band due to the C-H bond stretching and for CF, it appears at 2,925 cm −1 and shrinks to a single peak at 2,923 cm −1 of CPCs (HHC0).…”

“…It indicates good bonding/interaction of PR with CF in CPCs (HHC0). Moreover, characteristic peak of cured CPCs associated with OH stretching (3,425 cm −1 ) appears between the OH stretching peak of uncured PR (3,368 cm −1 ) and CF (2,925 cm −1 ) that further sign of interaction of PR with CF in CPCs [43,44].…”

Mechanical and tribological properties of nanofilled phenolic-matrix laminated composites

“…This phenomenon was observed also in the case of phenolic-resin/nSiC nanocomposites presented in a previous study. 35 At higher contents (2 %), the properties decrease compared to 1 %, probably due to the existent nanofiller agglomeration, showed by SEM images (Figure 4b), that could lead to stress-concentration sites and/or crack-initiation sites that sustain earlier mechanical failures and contribute to the decrease in the mechanical-properties.…”

“…However, it is noticed that the peak intensity increases with the nSiC content in the PR matrix of the laminated composites, which could be due to the higher nSiC content interacting with the phenolic resin. 35 The absorption of a diamond crystal generates a noise between 1900-2300 cm -1 , which, therefore, must be ignored.…”

Nature raw materials of Russian Primorsky Krai for concrete

“…Accordingly, macro fillers of various fractions remain after granite processing. They can be used in the production of concrete [7][8][9]. In the papers [5][6], the crushed granite from Wrangel deposit was used for fine-grained concrete (Tables 3,4).…”