Enhancing the Curing Efficiency and Physicochemical Properties of Acrylated Epoxidized Palm Oil Polyurethane Coatings via Double Acrylation-Thiol Modification
Year: 2025
Type: article
Abstract: The slow curing and suboptimal properties of epoxidized palm oil polyurethane acrylate (EPOUA) coatings remain significant challenges that limit their performance. This study enhances these coatings by applying acrylation-thiol (AT) modification onto the EPOUA coatings provided double acrylation-thiol effect to the EPOUA. EPOUA and AT were first synthesized separately, then the AT was blended at concentrations of 2, 4, 6, and 8 parts per hundred resin (phr) EPOUA. The blended mixture was then cast onto a silicone mold with a thickness of 1 mm and cured using ultraviolet (UV) radiation. The results show that 2 and 4 phr AT significantly improved curing, reducing time by 15 and 30 s, respectively. Crosslinking density also increased, with gel content rising by 6% and 9% at 2 and 4 phr AT, respectively, while maintaining low volatile organic compound (VOC) emissions (< 5%). Physical properties improved, with hardness increasing threefold at 2 phr AT and fourfold at 4 phr AT on glass, plywood, and steel. Adhesion remained excellent (5B rating) on plywood, steel, and aluminum. However, higher AT concentrations (6 and 8 phr) resulted in inconsistent curing and increased VOC emissions. These findings indicate that 4 phr AT optimally improves EPOUA coatings’ curing efficiency, crosslinking, and mechanical properties while maintaining environmental compliance.
Authors: Siti Noor Hidayah Mustapha, Mohamad Ismail Mohamad Isa, Muhammad Safwan Shamsuddin, Rasidi Roslan, Rohani Mustapha, Mohd Jumain Jalil
Language: English
Subfield: Organic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,090
Funder: Universiti Malaysia Pahang
Award: G278547850
OpenAlex ID: W4410864944