Synergistic Effects of Acrylic/Silica Armored Structured Nanoparticles on the Toughness and Physicomechanical Properties of Epoxy Polymers

Abstract

To take full advantage of the synergistic effects of soft organic and rigid inorganic toughening agents, elastomeric core/amine-functionalized silica shell armored nanocomposite particles were prepared through Pickering emulsion polymerization. The size and microstructure of the prepared armored impact modifier particles (AIMPs) were studied thoroughly. It was substantiated that the amine-functional silica nanoparticles have been successfully attached to the surface of the colloidal polymer particles. The obtained results revealed that the incorporation of the prepared AIMPs into epoxy resin could exert significant positive influences on its toughness, tensile strength, and modulus. An optimal content of AIMPs was found to exist, which enhanced the fracture toughness by 8 times, the fracture energy by 50 times, and the tensile strength by 38% for the modified sample using 7 wt % AIMPs in comparison with those of the neat epoxy resin. The primary toughening mechanisms were related to crack pinning and deflection as well as deboning of AIMPs from the epoxy matrix followed by plastic void growth.

Polyamine–Diazirine Conjugates for Use as Primers in UHMWPE–Epoxy Composite Materials

“…This results in the formation of multiple cross-links throughout the material (Figure B), transforming the liquid resin (a thermoplastic) into a hard, nonmeltable solid (a thermoset). Surface-bound amines can also react with epoxy resin, and this strategy has been leveraged by other groups to achieve enhanced bonding within carbon fabric-, graphene oxide-, and silica-epoxy composites. − …”

Epoxy Flooring/Oil Fly Ash as a Multifunctional Composite with Enhanced Mechanical Performance for Neutron Shielding and Chemical-Resistance Applications

“…The peaks in the range 1630–1410 cm –1 might be referred to as CC bonds in the aromatic molecular structure . Besides, the peaks in the spectral range of 1390–1150 cm –1 can be assigned to the C–O group of the rings’ of the phenols and aromatic structures. , The peaks between 1130 and 1050 cm –1 could be attributed to the asymmetric stretching vibration of Si–O–Si in the quartz − included in the epoxy base. The FTIR peaks in the range of 1050–720 cm –1 might be assigned to the oxirane groups’ symmetric/asymmetric stretching vibration mode C–O–C …”

Eco-Friendly AMPS-Doped Polyaniline/Urethane-Methacrylate Coating as a Corrosion Protection Coating: Electrochemical, Surface, Theoretical, and Thermodynamic Studies

“…For instance, hydrophobic fluorine-substituted polyaniline has been synthesized and used as an anticorrosion filler in epoxy resin. 6 The fluorine atoms of the prepared PANI can augment the dissolution and dispersion of the conducting polymer within the epoxy matrix. Thus, the incorporated conducting polymer significantly enhanced the intactness of the coated metal in the salt-spray experiment.…”