Conference proceeding
A study of initiating systems for photopolymerization of composites
RADTECH'98 NORTH AMERICA UV/EB CONFERENCE PROCEEDINGS, pp.31-37
1998
Abstract
The spatial and temporal control afforded by photopolymerizations make them attractive for rapid and inexpensive processing of polymeric composites. However, photopolymerizations of thick and fiber-filler polymers are more challenging than polymerizations of thin-film systems due to the exponential reduction in light intensity through the sample resulting from absorption and scattering. Therefore. proper selection of the initiator formulation and illumination wavelength are imperative to ensure that the samples cure throughout. In this contribution, we present a systematic study of benzoyl phosphine oxide initiators for preparation of glass reinforced vinyl ester composites by UV initiated polymerization. These initiators were selected due to their good absorption in the spectral region between 360 and 410 nm, and their ability to efficiently photobleach upon generation of active centers. Studies were performed to determine the effect of light intensity, photoinitiator concentration and sample thickness on the cure time of the resins. It was shown that there exists an optimum photoinitiator concentration at which the cure time is minimum and conversion is maximum. It was also observed that increasing the light intensity reduced the cure time and increasing the sample thickness resulted in a small decrease in the optimum photoinitiator concentration. Finally, composite samples were prepared both by photocuring and by thermal curing, and mechanical properties were evaluated.
Details
- Title: Subtitle
- A study of initiating systems for photopolymerization of composites
- Creators
- V NarayananK K BaikerikarA B Scranton
- Resource Type
- Conference proceeding
- Publication Details
- RADTECH'98 NORTH AMERICA UV/EB CONFERENCE PROCEEDINGS, pp.31-37
- Language
- English
- Date published
- 1998
- Academic Unit
- Chemical and Biochemical Engineering
- Record Identifier
- 9984231959802771
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