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Cyclic acetals were used to replace the conventional amines in bimolecular photoinitiating systems. The mixtures of benzophenone derivatives and cyclic acetals were used to initiate the UV photopolymerization of 1,6-hexanedioldiacrylate (HDDA). Camphorquinone (CQ)/1,3-benzodioxole (BDO) combinations were used to initiate the visible light photopolymerization of 2,2-bis[4-(2-hydroxy-3-methacryloxypropoxy)phenyl]propane (BisGMA)/triethylene glycol dimethacrylate (TEGDMA) (70/30 wt%) for dental application. The kinetics was recorded by real-time infrared spectroscopy (RTIR). Ethyl 4-N,N-dimethylaminobenzoate (EDMAB) was used as control in the same photocuring condition. The results showed that the addition of cyclic acetals greatly increased the rate of polymerization (Rp) and final double bond (DC) of HDDA. Combination of p-chlorobenzophenone (CBP)/BDO had the highest initiating reactivity. BDO also showed an effective coinitiator for camphorquinone-based initiator system. Comparing with EDMAB, CBP/BDO and CQ/BDO indicated comparable initiating reactivity. Moreover, the natural component characteristics of BDO made it a promising alternative to commercial amine in biomolecular photoinitiating system.
Author: Bastard471
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Added: May 16, 2008
VELZ FREESTLYE
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Author: NUFFBUD5
Keywords: Short Film Sketch Spoof Stand-up Video Blog Athletics Business Communications Computer Science Economics Engi
Added: May 16, 2008
LIL KIM SEX TAPE
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Author: NUFFBUD5
Keywords: Short Film Sketch Spoof Stand-up Video Blog Athletics Business Communications Computer Science Economics Engi
Added: May 16, 2008
TWAN CAUGHT SLIPIN
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Author: NUFFBUD5
Keywords: Short Film Sketch Spoof Stand-up Video Blog Athletics Business Communications Computer Science Economics Engi
Added: May 16, 2008
NUFF VS SOME DUDE NOBODY KNOWS THEN HE GET KNOCKED OUT
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Author: NUFFBUD5
Keywords: Short Film Sketch Spoof Stand-up Video Blog Athletics Business Communications Computer Science Economics Engi
Added: May 16, 2008