New UV‐Curable Anticorrosion Coatings from Vegetable Oils

Abstract

Bio‐based epoxy resins are attracting widespread interest in the field of polymer thermosets as environmentally friendly building block. In the present study, the feasibility of applying UV‐curable epoxidized vegetable oils (EVOs) as anti‐corrosion coating is investigated. Rheological characterization of EVOs is carried out, and their viscosity‐shear relationship is evaluated. The cationic UV‐curing of EVOs successfully gives rise to crosslinked materials with a wide range of thermo‐mechanical properties, evaluated by differential scanning calorimetric analysis and dynamic thermal mechanical analysis. A high epoxy‐group conversion, ranging from 93% to 99%, is always obtained. The thermal stability and surface properties of the bio‐based coatings, such as, pencil hardness, adhesion, solvent resistance, and contact angle, are analyzed. Moreover, the corrosion protection effectiveness of the coatings is characterized by potentiodynamic polarization and electrochemical impedance spectroscopy measurements. In addition, field emission scanning electron microscopy is used to assess the samples morphology after corrosion tests.

Partially acrylated linseed oil UV-cured coating containing a dihemiacetal ester for the corrosion protection of an aluminium alloy

“…These coatings from vegetable oils, in the absence of corrosion in hibitors or fillers, usually present lower protective performance compared to conventional materials affecting the long-term sustain ability [12,20). To improve the corrosion protection, these new pro tective systems must have both good barrier properties and good adhesion to the metal substt•ate.…”

Bio‐Based Piezo‐ and Thermoresistive Photocurable Sensing Materials from Acrylated Epoxidized Soybean Oil

“…[ 15,16 ] In fact, the consumption of nonrenewable energy and the carbon dioxide emission can be reduced through the use of natural‐based materials, being bio‐based thermoplastics widely available but bio‐based thermosets still limited, representing thus an interesting and urgent challenge for materials research. [ 17 ]…”

“…[15,16] In fact, the consumption of nonrenewable energy and the carbon dioxide emission can be reduced through the use of natural-based materials, being bio-based thermoplastics widely available but bio-based thermosets still limited, representing thus an interesting and urgent challenge for materials research. [17] The use of renewable resources for the production of thermosets polymers are continuously increasing. In this scope, vegetable oils, terpenes and carbohydrates such as soybean, linseed and castor oils, limonene or starch are among the most used monomers for the manufacture of plastics, elastomers, or hydrogels.…”

Frontal‐Photopolymerization of Fully Biobased Epoxy Composites

“…Moreover, a broad peak centered at 3460 cm -1 appeared after the curing, as expected since the opening of the epoxy rings leads to the formation of hydroxyl groups. [70,71] The epoxy ring conversion (82%) was calculated by measuring the decrease of the epoxy ring peak centered at 910 cm -1 , as described in the experimental section.…”