Evaluation of the Ultraviolet-Curing Kinetics of Ultraviolet-Polymerized Oligomers Cured Using Poly (Ethylene Glycol) Dimethacrylate

Abstract

Ultraviolet (UV)-curable oligomers are increasingly being used in various industries because they can be applied rapidly and have excellent physical properties. Ultraviolet polymerization is used for manufacturing such oligomers. Reactive diluents, which are employed during the secondary curing of UV-curable oligomers, can help elucidate the curing behaviors of these oligomers. In this study, poly (ethylene glycol) dimethacrylate (PEGDMA) was used as the reactive diluent for UV-curable oligomers. Photodifferential scanning calorimetry (photo-DSC) and shrinkage measurements revealed that the curing behavior of the polymers was dependent on the size and number of molecules of PEGDMA. The effect of the small-size PEGDMA on curing behavior was greater than that of the larger molecules. Further, in most cases, the use of a larger amount of PEGDMA resulted in lower reactivity.

Numerical and experimental study on multiphase printing of polymeric biconvex micro lenses

“…To better predict the lens profile, we need to incorporate the curing kinetics of the lens material in the numerical model. We also need to measure shrinkage using photo-differential scanning calorimetry, and measure the curing reaction heat using a differential scanning calorimeter and UV irradiation unit in future experiments [56][57][58]. The research group will study the effects of material shrinkage and curing reaction heat on lens shape in the numerical model.…”

Design and Preparation of a Micro-Pyramid Structured Thin Film for Broadband Infrared Antireflection

“…Previous studies have already shown many alternative approaches [8,13,14] and nano-imprint lithography (NIL) has proved to be more appropriate for processing the large-area surface texture [15][16][17][18][19][20]. Meanwhile, wet etching of absorbing materials (such as silicon) is widely used in the fabrication of the micro-pyramid structure by combining with the NIL technique [15,21]. Based on the better AR property of the micro-pyramid, a method to fabricate an optical multifunction structure was proposed by Päivänranta et al [22] by means of wet etching, nano-imprint lithography (NIL), and reactive ion etching (RIE).…”