Preparation of polyurethane-acrylate and silica nanoparticle hybrid composites by a free radical network formation method

Abstract

In this study, hybrid composites of polyurethane-acrylate (PUA) and silica nanoparticle were prepared by a radical method. For this aim, silica nanoparticles were chemically functionalized with 3-methacryloxypropyltrimethoxysilane. Polyurethane was synthesized and then modified with 2-hydroxyethyl methacrylate to yield PUA. Then, different amounts of modified-silica were used to prepare PUA composites by the addition of an ethylene glycol dimethacrylate crosslinker. Fourier-transform infrared spectroscopy confirmed the successful functionalization of silica nanoparticles and the preparation of PUA. Structural investigation of the functionalized-nanoparticles and also nanocomposites was carried out using X-ray diffraction and electron microscopy. According to the thermal gravimetric analysis results, char residue of HSiO 2 is 86.6%, which decreases to 81.3% in the case of MSiO 2 as a result of its modifier degradation content of 5.3%. PUAS5 shows main decomposition temperatures of 396.5 and 454.9 • C and also char content of 5.7% at 700 • C. The high amount of MSiO 2 can also be resulted in higher degree of crosslinking and therefore higher thermal stabilities and char residue.

Self-Healing UV-Curable Urethane (Meth)acrylates with Various Soft Segment Chemistry

“…Notably, these materials have garnered significant interest, particularly in the coatings industry [5,13], the development of pressure-sensitive adhesives [23,24], hydrogels [25][26][27], and diverse drug delivery applications. This encompasses approaches such as direct PEGylation of therapeutics [28,29] and the utilization of PEG-based carriers [30], such as nanoparticles [31,32], dendrimers [5,15,33], or micelles [32,34,35]. Researchers are currently investigating the impact of PEG's molecular weight on polymer properties.…”

Preparation of polyurethane composites reinforced with halloysite and carbon nanotubes

“…[ 18 ] As an example, the shear force applied on polymer melt is a prominent factor on dispersion of CNT [ 19 ] and chain disentanglement of polyurethane [ 20,21 ] in the melt mixing method, where the polymer melt with higher viscosity results in higher mixing energy input. [ 20 ] Polyurethane‐based nanocomposites showed higher mechanical characteristics, barrier properties, [ 22 ] abrasion resistance, [ 23,24 ] and thermal stability, [ 25–28 ] compared with their neat matrix. Carbon nanotube (CNT)/polyurethane composites combine the merits of CNT and the polyurethane matrix, and possess some special functions with regard to the conventional polyurethane composites.…”