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Effect of oxygen on the crosslinking and mechanical properties of a thermoset formed by free-radical photocuring

✍ Scribed by Morgan Pilkenton; Jeremiah Lewman; Richard Chartoff

Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 753 KB
Volume: 119
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.32650

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✦ Synopsis

In this article, we report on the formation of optically transparent photopolymer films from hexanediol diacrylate (HDDA) by inkjet printing, where droplets of monomer approximately 5 lm in diameter were deposited onto a surface. The films were cured by irradiation with a UV-light-emitting-diode light source. It was found that the inkjet-printed HDDA films picked up a considerable amount of absorbed O 2 during printing. Exposure to increasing amounts of O 2 during photocuring severely restricted both the degree of conversion and the UV dose required for gelation in proportion to the O 2 concentration.

Viscoelastic property data indicated that exposure to reduced oxygen concentrations during thermal postcuring (dark reaction) resulted in linear trends of increasing modulus above the glass-transition temperature (T g ) and increasing T g itself. Thus, the final crosslink density was greater in fully cured samples that were exposed to atmospheres with increasing inert gas concentrations. V

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