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

Ji-Won Park,Young-Kwan Kim,Jong-Gyu Lee,Dong-Hun No,Gyu-Seong Shim,Sang-Eun Moon,Hyun-Joong Kim

doi:10.3390/coatings8030099

Ji-Won Park, Young-Kwan Kim + Show 5 more

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https://doi.org/10.3390/coatings8030099

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Journal: Coatings	Publication Date: Mar 9, 2018
Citations: 6	License type: CC BY 4.0

Affiliation: Seoul National University, Samsung (South Korea)

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.

Highlights

Ultraviolet (UV)-curable systems have several advantages such as rapid curing, low concentration of volatile organic compounds, and material diversity
The numberaverage/weight-average molecular weight corresponding to this section, which was related to a highly uniform material having a polydispersity index (PDI) of 1.03, was measured to be approximately 160 g/mol
During generalbut solvent time limit for the photopolymerization process depends the composition of the system is polymerization, it is the monomolecules such as those of a solvent, that are measured

Summary

Introduction

Ultraviolet (UV)-curable systems have several advantages such as rapid curing, low concentration of volatile organic compounds, and material diversity. Owing to these advantages, UV-curable systems are used in various industries, especially in the coating industry. UV-curable systems can be used to implement solvent-free curing systems that consist of reactive diluents, polyfunctional oligomers, photoinitiators, and additives. Solvent polymerization, which is popularly used in the industry, allows for a wide choice of solvents; the process conditions can be appropriately varied in order to tune the performance of the polymerized material. Growing environmental concerns related to the use of these solvents has triggered the need for a solvent-free polymerization process [3,4,5]

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