Photopolymerization of Acrylates

n CH₂=CHCOOR → [–CH₂–CH(COOR)–]_n

Overview

UV or visible light activates a photoinitiator that generates free radicals, which then initiate chain polymerization of acrylate monomers. The reaction is extremely fast (seconds to minutes) compared to thermal polymerization (hours). This enables rapid curing of coatings, adhesives, and 3D printing resins.

Everyday Example

UV-cured gel nail polish at the nail salon hardens in 30 seconds under a UV lamp using this exact photopolymerization reaction.

Industrial Importance

UV curing is used for coatings, inks, adhesives, dental fillings, and stereolithography 3D printing. The market exceeds $10 billion annually.

Properties

Type: Photochemical
Reversible: No
Energy: Exothermic
ΔH: -78.0 kJ/mol
Catalyst: Photoinitiator (e.g., benzoin)

Related Reactions

Chlorophyll Fluorescence Cis-Trans Isomerization of Retinal Dye-Sensitized Solar Cell (Grätzel Cell) Firefly Bioluminescence (Luciferin Oxidation) Luminol Chemiluminescence Ozone Decomposition by UV Ozone Formation by UV Light Photocatalytic NOx Removal Photocatalytic Water Splitting (TiO₂) Photochemical Cycloaddition ([2+2])

Frequently Asked Questions

What is the equation for Photopolymerization of Acrylates?

The balanced equation is: n CH₂=CHCOOR → [–CH₂–CH(COOR)–]ₙ.

What type of reaction is Photopolymerization of Acrylates?

Photopolymerization of Acrylates is a photochemical reaction.

Is Photopolymerization of Acrylates exothermic or endothermic?

Photopolymerization of Acrylates is exothermic (releases energy). The enthalpy change (ΔH) is -78.0 kJ/mol.

What conditions are needed for Photopolymerization of Acrylates?

This reaction requires a catalyst (Photoinitiator (e.g., benzoin)).