Researchers at the University of California, Santa Barbara, along with colleagues at Osaka University and the Tokyo Institute of Technology in Japan, have discovered a way to significantly enhance the efficiency of photopolymerization, a process that uses light to convert liquid monomers into solid polymers.

Photopolymerization is a widely used technique in various fields, such as 3D printing, dentistry, and electronics, but its efficiency has always been limited by the fact that only a small fraction of the light is effectively absorbed by the photosensitive molecules.

The team, led by UCSB professor of chemistry Craig Hawker, made a breakthrough by incorporating a newly designed organic dye into the photopolymer resin. This dye acts as a highly efficient light absorber, capturing a much larger portion of the incident light and converting it into chemical energy that drives the polymerization process.

By optimizing the dye concentration and the irradiation conditions, the researchers were able to achieve an unprecedented 99% conversion of monomers into polymers within just a few seconds of light exposure. This represents a significant improvement compared to conventional photopolymerization methods, which typically achieve only around 50% conversion.

"Our findings open up new possibilities for photopolymerization-based technologies by dramatically reducing the energy consumption and processing time required for various applications," said Hawker.

The enhanced efficiency of photopolymerization enabled by this discovery could lead to faster and more energy-efficient 3D printing, improved dental fillings and adhesives, and more efficient manufacturing of electronic components. The technology also holds promise for applications in microfluidics, sensors, and optics, where precise control over the polymerization process is crucial.

The findings were published in the journal Science Advances.