Abstract
The quantity of the remaining double bonds (RDB) in sixty-six kinds of polymerized visible ligth-cured resins was measured. As monomers, three kinds of cyclophosphazene monomers and eigth kinds of commercial monomers were prepared for the visible ligth-cured resins by changing the photoinitiator compositions (six kinds). Trial resins were investigated by means of a FT-IR with the liquid film method. The infrared absorbance measurements were made before irradiation and chronologically repeated after the resins had been polymerized by irradiation for 90sec. The quantity of RDB of all trial resins decreased linearly with the logarithmic time after the start of irradiation. When the inhibitor (BHT) was added, the order of the conversion was: 9G>BPE-200≧4G≧3G≧U-2TH>BPE-100>(EMP-800+3G)≧2.6E>(EMA)6 > (EMA))7)>(EMA))8). When the inhibitor was not added, the order of the conversion was: BPE-200>9G≧4G≧3G≧U-2TH>BPE-100>(EPM-800+3G)≧2.6E>(EMA))6)>(EMA))7)>(EMA))8). The conversion increased with the decrease in the number of polymerization group in cyclophosphazene resins and with the increase of the CH)2)CH)2)O chain length in EDMA and BMPEPP resins. The resins with photoinitiator composition A (CQ 0.50wt%, DMAEM 1.00wt% and BHT 0.01wt%) and C (CQ 0.30wt%, DB 0.15wt%, DMAB-EMA 1.40wt% and BHT 0.01wt%) were preferable, showing high conversion. The resins not containing the inhibitor showed higher conversion than those containing the inhibitor, but had a shorter shelf life.
