Ultra-High Through-Cure of (Meth)Acrylate Copolymers via Photofrontal Polymerization

Area of Science:

• Polymer Chemistry
• Materials Science

Background:

• Photopolymerization offers advantages like speed and control but is limited by light penetration depth in thick materials.
• Existing strategies like dual curing and frontal polymerization show promise but practical applications for deep curing are limited.

Purpose of the Study:

• To investigate the potential of photofrontal polymerization for fast and easy production of several-centimeter-thick (meth)acrylic layers.
• To optimize monomer/initiator systems for deep curing applications.

Main Methods:

• Evaluation of monomer/initiator systems based on optical density and photobleaching.
• Study of depth-dependent polymerization by varying monomer ratio and photoinitiator concentration.
• Application of photofrontal polymerization using only photoinitiator and light.

Main Results:

• Achieved a curing depth of up to 52 mm within minutes.
• Identified optimal photoinitiator concentrations for maximizing curing depth.
• Demonstrated the feasibility of producing thick (meth)acrylic layers rapidly.

Conclusions:

• Photofrontal polymerization is a viable method for rapid, deep curing of thick (meth)acrylic materials.
• Optimized photoinitiator concentration is crucial for achieving significant curing depths.
• This technique offers a practical solution for overcoming light penetration limitations in photopolymerization.