Journal article
Influence of Water on Cure Kinetics and Material Properties of DGEBA Epoxies via UV and EB Irradiation
Polymeric materials science and engineering, Vol.93
01 Oct 2005
Abstract
Previously we have found that the presence of water significantly alters the UV and EB cure behavior of such DGEBA epoxies by initially retarding the rate of polymerization and accelerating the rate relative to that of 'dry' systems in latter stages of the reaction 1 . Other authors have observed the influence of water on epoxy polymerization. Decker et al. found in their study of PGE, that the presence of water caused the rate of polymerization to decrease and the final degree of conversion to increase. However, Decker did not observe a latency period in the epoxy conversion during the initial stages of the reaction or an acceleration after all the water was consumed 2 . Hartwig et al. observed that the increase of moisture caused the rate of polymerization to decrease due to the side reactions between the activated monomer chain end and water. Hartwig concluded that this delay in epoxy consumption was due to the formation of a stable five member intermediate 34 . In this investigation a spectroscopic technique is used to quantify water concentration in epoxy samples and the influence of water on the epoxy reaction kinetics. The results suggest that care must be taken to control the water content in cationically cured epoxy systems. A fundamental understanding of the influence of water on the processing structure and properties of radiation cured epoxies is critically important for their successful use in high performance applications.
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Details
- Title
- Influence of Water on Cure Kinetics and Material Properties of DGEBA Epoxies via UV and EB Irradiation
- Creators
- Jihean LeeGiuseppe Palmese
- Publication Details
- Polymeric materials science and engineering, Vol.93
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Identifiers
- 991019170341304721