期刊
JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS
卷 48, 期 4, 页码 745-754出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00222340902959719
关键词
critical exponent; epoxy acrylate; light intensity; photo-DSC; photoinitiator
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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