【摘要】 采用实时 FTIR研究了在红外激光照射下 ,阳离子菁染料 -有机硼络合物 1 ,3,3,1′,3′,3′-六甲基 -1 1 -氯 -1 0 ,1 2 -亚丙基吲哚三碳菁 -正丁基三苯基硼引发的三羟甲基丙烷三丙烯酸酯 ( TMPTA)的光聚合反应动力学 .研究发现 ,随激光功率的提高 ,单体的聚合速度与双键转化率均有显著提高 .在临界浓度以下 ,引发剂的含量增加可以加快光聚合反应速率 .样品厚度的增加明显降低双键转化率与聚合速度 .计算结果表明 ,该体系的量子聚合效率为 4 1 .8mol/einstein.在 1 7.0 m W/cm2 激光照射下 TMPTA最高双键转化率可以达到80 % .更多还原

【Abstract】 The infrared laser induced photopolymerization kinetics of TMPTA, with a novel cationic cyanine dye borate complex(CBC), 1,3,3,1′,3′,3′ hexamethyl 11 chloro 10,12 propyleneindo tricarbocyanine triphenylbutyl borate as photoinitiator, was investigated by Real Time FTIR(RTFTIR) in this paper. The CBC adopted here has maximum absorption wavelength λ max at 790 nm(in TMPTA photopolymerization sample). The photopolymerization system consisted of equal weight of a monomer (trimethylolpropanetriacrylate, TMPTA), a binder(AA/MMA/St/BA copolymer), and different content of CBC. The double bond conversion( Y ) was determined from the drop of the absorption at 1 620 and 1 635 cm -1 in FTIR spectra and was continuously monitored by RTFTIR during laser irradiation. Y increased rapidly in the first 10 seconds and reached 37% for laser irradiation power of 17.0 mW/cm 2, CBC content of 2.0% and sample thickness of 20 μm. Higher Y and polymerization rate( R p) could be achieved by increasing the laser power or decreasing the sample thickness. Furthermore, there existed a critical content for CBC, below which the increasing of CBC concentration would improve Y and R p. Higher CBC content over the critical value would lead to the "filter effect", which prevents the laser beam from penetrating into the deep layer of the sample, and then deteriorates the photopolymerization. The quantum photopolymerization yield of this system was 41.8 mol/einstein.更多还原