Molecular Weight Control and Reaction Kinetics Analysis of Polyurethane Acrylate in Photopolymerization
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Polyurethane is a polymer synthesized through step-growth polymerization using polyol and diisocyanate as monomers. Known for its excellent mechanical properties, it is widely used in various industries. Polyurethane acrylate, which features acrylate groups at the chain ends, offers the advantage of rapid and easy curing through photopolymerization. However, the mechanical properties of photopolymerized polyurethane acrylate are significantly influenced by chain length and structure, and the curing process involves complex reaction kinetics as the system transitions from a liquid oligomer to a high molecular weight solid. Therefore, controlling the chain length or molecular weight during polymerization and understanding the reaction kinetics during photopolymerization are crucial. This study explores the trends in molecular weight of polyurethane acrylate synthesized by varying the monomer composition ratio and analyzes the reaction kinetics during photopolymerization.