Critical Exponents of Photoinitiated Gelation at Different Light Intensities
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Date
2009
Authors
Doğruyol, Zekeriya
Arsu, Nergis
Pekcan, Önder
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor & Francis Inc
Abstract
A photo-differential scanning calorimetric (Photo-DSC) technique was used to study the photoinitiated radical polymerization of a 75% epoxy diacrylate (EA) and 25% tripropyleneglycoldiacrylate (TPGDA) mixture with 2-mercaptothioxanthone (TX-SH) as photoinitiator by using different light intensities. Photopolymerization reactions were carried out under identical conditions of temperature and initiator concentration. It was observed that all conversion curves during gelation at various Might intensities present good sigmoidal behavior as predicted by the percolation model. Observations around the critical time called the glass transition point (t(g)) taken for polymerization to reach the maximum rate (R-pmax) show that the gel fraction exponents beta obeyed the universal percolation picture. On the other hand R-pmax t(g) and final conversion values were found to be dependent on the UV light intensity.
Description
Keywords
Critical exponent, Epoxy acrylate, Light intensity, Photo-DSC, Photoinitiator
Turkish CoHE Thesis Center URL
Citation
15
WoS Q
N/A
Scopus Q
Q3
Source
Volume
48
Issue
4
Start Page
745
End Page
754