新型红外光引发剂的激光光聚合研究

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 λ max at 780 nm in 2 butanone with the maximum molar extinction coefficient ε max of 1 4×10 5 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.