Reinforcement effect of nanodiamond on properties of epoxy matrix

Abstract

Epoxy/nanocrystalline diamond nanocomposites composites were prepared by dispersing ultrasonically, 0.4, 0.7, 1.0, and 4.0 wt% acid‐treated nanocrystalline diamond (NCD) powder in epoxy matrix. Fourier infrared spectroscopy was utilized to study the moieties attached to the nanodiamond particles. The trace elements present in NCD powder before and after acid treatment were analyzed by ion beam techniques. Thermomechanical properties of the nanocomposites showed that incorporation of low content (0.4 wt%) of nanodiamond powder into epoxy matrix enhanced the storage modulus, loss modulus, and hardness by ∼68, ∼55, and ∼86%, respectively, over neat epoxy. By increasing the concentration of modified NCD to 0.7 wt% resulted in lower values of hardness and thermomechanical properties but still remain higher than neat epoxy. An increasing trend in properties was again observed at 4 wt% concentration of modified nanofiller. The glass transition temperature was up shifted to ∼110°C over neat epoxy. The mechanisms responsible for enhanced properties of epoxy matrix are also discussed in detail. POLYM. COMPOS., 34:811–818, 2013. © 2013 Society of Plastics Engineers

Development of Chitosan/Bacterial Cellulose Composite Films Containing Nanodiamonds as a Potential Flexible Platform for Wound Dressing

“…Upon the addition of NDs, no severe agglomeration is seen at low ND loadings (2%), implying the uniform dispersion and wrapping of the NDs particles by the polymer chains. However, at higher concentrations, small clusters are visible that can be due to the high specific surface area of NDs [34]. The transmission optical micrograph (Figure 1f) also reveals that after solvent evaporation, the bacterial cellulose fibrils are actually being embedded in the chitosan films and they preserved their crystalline structure after the fabrication step.…”

“…The band starting from 1000 cm −1 with a peak at 1120 cm −1 suggests the combination of bands characteristic of nitrogen and the ethereal (≡C–O–C≡) groups. The abundant oxygen containing functional groups on the surface of ND as well as strong van der Waals forces between the high surface area nanoparticles lead to easy agglomeration of ND in the polymer matrix (Figure 1c) [34]. The surface of ND is replete with oxygen containing groups such as hydroxyl and carboxyl, which can interact with the hydroxyl and amine groups of BC and CS.…”

“…The decrease in the T d value at higher ND contents can be associated with the large surface area to volume ratio of NDs. As this ratio increases, more free volumes would be created in the polymer matrix so as to provide more free space for large polymer chain movements [34]. However, the trend is erratic and cannot be all-inclusive.…”

Preparation and mechanical properties of epoxy/diamond nanocomposites

“…However, very limited attention has been paid so far to the use of ND as filler particularly reactive filler to improve the properties of epoxy [16][17][18].…”

Balance of mechanical and electrical performance in polyimide/nano titanium dioxide prepared by an in‐sol method

“…In recent years, a variety of composite materials have been prepared to meet the growing demand of performance . Among these composite materials, hybrid polyimides (PIs) doped with silicon dioxide (SiO 2 ), titanium dioxide (TiO 2 ), aluminum oxide (Al 2 O 3 ), and other inorganic nanoparticles have received more attention for their excellent corona resistance.…”