Date of Award

8-2000

Degree Name

Master of Science

Department

Chemical and Paper Engineering

Department

Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. P. Dan Fleming III

Second Advisor

Dr. Alexandra Pekarovicova

Third Advisor

Dr. Jan Pekarovic

Access Setting

Masters Thesis-Open Access

Abstract

The purpose of this study is to develop a new standard blend of photoinitiators, having properties of low odor, high solubility, faster curing, and being efficient for pigmented as well as for clear systems. In the process, we expect to understand the behavior of mixtures of photoinitiators and their resulting UV spectra. An important first step is to prepare different blend with different photoinitiator and characterize them on cure basis. Curing properties were studied by the KMnO4 yellow stain density test. The absorption range in the UV spectra was measured for each Photoinitiator with methanol and acrylate as background material. It was found that the acrylate esters in CN120A75/TRPGDA absorb at wavelengths up to 310 nm. Therefore, it is necessary to consider the n➔π* extinction coefficient, and its associated λmax' and use acrylated materials as the background for optimizing the effectiveness of photoinitiators in acrylate systems. The results indicated that a combination of IR369, IR2959, IR819 and IR184 could be a solution to the problem. To find the exact proportion of each Photoinitiator in the blend, different blends were mixed with ink and samples were printed on Comco press. Ink cure analysis, Image analysis were done to determine the cure rate and print quality respectively.

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