The influence of irradiation parameters

such as the irradiation time

temperature and the acrylate functionality of monomers on the infrared laser induced photopolymerization were investigated in this paper A novel cationic cyanine dye-borate complex

1

3

3

1′

3′

3′-hexamethyl-ll-chloro-10

12-propylene-tricarbocyanine triphenylbutylborate

was employed as the photoinitiator It had maximum absorption wavelength λmax at 780 nm in 2-butanone with the maximum molar extinction coefficient εmax of 1.4×105 L·mol-1 cm-1 which matched well with the emitting wavelength

796 nm

of the adopted infrared laser diode With poly(vinyl alcohol)(PVA)as oxygen barrier layer

photopolymerization system containing trihydroxymethylpropanetriacrylate(TMPTA)

binder and photoinitiator was cured by 2 min of infrared laser irradiation Modest improvement of the double-bond conversion could be achieved by increasing the irradiation time or temperature．Furthermore．it was found that the monomer with diacrylate functionality had higher double bond conversion than that with triacrylate functionality under the same irradiation conditions．Double-bond conversion of 52％could be achieved for diacrylate monomer phthalic diglycol diacrylate(PDDA)compared with 25% for triacrylate monomer TMPTA．