Fabrication and evaluation of acrylated epoxidized castor oil‐toughened diglycidyl ether of bisphenol A nanocomposites

Abstract

Castor oil-based epoxy monomer was prepared using a two-step approach: epoxidation of castor oil, followed by acrylation of epoxidized castor oil. A bio-based diglycidyl ether of bisphenol A (DGEBA) epoxy nanocomposites was prepared by the incorporation of organo-modified montmorillonite (OMMT) clay to the DGEBA/AECO system. The cured bio-based DGEBA epoxy nanocomposites at 0.80:0.2:0.001 g/g exhibited higher tensile strength (56 MPa), tensile modulus (1933 MPa), flexural strength (132 MPa), flexural modulus (2518 MPa), elongation (23.1 %), and impact strength (34 kJ/m 2 ). The nanocomposites at 0.6:0.4:0.001 g/g can easily bend up to 3608 without any damage; similarly, the 0.8:0.2:0.001 g/g system can bend up to 1808. Thermal behaviour of the bio-based epoxy systems was characterized by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA). The obtained nanocomposites displayed a higher char yield (8.9 %) at 700 8C and glass transition temperature (108 8C) than the DGEBA/AECO systems. Further SEM analysis was used to study the morphological changes in the fractured surfaces of bio-based epoxy systems, which reveals that crack propagation decreases with addition of AECO to the DGEBA epoxy system.

Development of castor oil–based polymers: A review

“…Epoxy nanocomposites were prepared by Paluvai et al with acrylated epoxidized castor oil toughened with diglycidyl ether of bisphenol A. The nanofillers used in the composite were epoxy sisal fibers and cloisite 30B clay.…”

“…EMETCO has a low viscosity and it is also multifunctional thus increasing versatility for polymerization. Paluvai et al prepared castor oil–based epoxy monomer through the two‐step approach of epoxidation and acrylation. Organo‐modified montmorillonite (OMMT) clay was then incorporated into the epoxy monomer to prepare nanocomposites.…”

Graphene Oxide Decorated with Titanium Nanoparticles to Reinforce the Anti-Corrosion Performance of Epoxy Coating

“…Epoxy resin (EP) is widely used in organic anti-corrosive coatings due to its good corrosion resistance, strong adhesion to metal substrate, and low cost [4,5]. However, epoxy resin has a high brittle character, which usually results in cracks on the coating surface [6,7]. In addition, during the curing process of the resin, the volatilization of the diluent leads to the appearance of micropores in the resin, which further leads to the deterioration of the shielding performance and the anti-corrosion performance of the resin.…”

Synthesis and curing properties of castor oil‐based triglycidyl ether epoxy resin

“…In recent years, it has been reported that epoxy vegetable oil can be used as an effective toughening agent to modify epoxy resin. Many researchers have investigated the use of epoxidized soybean oil (ESO), 16,17 epoxidized linseed oil (ELO), 18,19 epoxidized palm oil (EPO), 20 epoxidized crambe oil (ECMO) 21 and epoxidized castor oil (ECO) 22 as a reactive toughener, plasticizer and diluent for epoxy resins. However, the alicyclic epoxy groups of epoxy vegetable oils have the problems of low activity and difficult to be cured 23,24 …”