Critical Exponents of Photoinitiated Gelation at Different Light Intensities

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Date

2009

Authors

Doğruyol, Zekeriya
Arsu, Nergis
Pekcan, Önder

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Publisher

Taylor & Francis Inc

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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.

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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