CAJ | 학술논문

采用实时红外光谱( RTIR)研究了黄酮( FL)为紫外光光敏剂,不同氢给体(如叔胺)为助引发剂时三丙二醇二丙烯酸酯( TPGDA)的光聚合反应.结果表明, FL分子中的大仔共轭体系使其UV吸收峰的摩尔消光系数(εmax)远远高于商业化光敏剂二苯甲酮(BP).当FL与不同助引发剂配合使用时, TPGDA光聚合动力学有较大差异,其中叔胺体系助引发剂能够与激发态FL发生有效的电子/质子转移过程,产生胺烷基自由基活性种引发TPGDA的光聚合反应,所得固化膜的最终双键转化率( DCf )为93%~97%,接近完全固化；而芝麻素( SM)及胡椒环( BDO)作为助引发剂时TPGDA的聚合速率则很低,固化膜的DCf 仅为32%~38%.当光敏剂质量分数为1.0%,4-N,N'-二甲氨基苯甲酸乙酯(EDAB)质量分数为1.0%时, FL/EDAB 引发TPGDA的聚合动力学与商业化BP/EDAB的相同,所得固化膜的DCf 均为97%.
채용실시홍외광보( RTIR)연구료황동( FL)위자외광광민제,불동경급체(여숙알)위조인발제시삼병이순이병희산지( TPGDA)적광취합반응.결과표명, FL분자중적대자공액체계사기UV흡수봉적마이소광계수(εmax)원원고우상업화광민제이분갑동(BP).당FL여불동조인발제배합사용시, TPGDA광취합동역학유교대차이,기중숙알체계조인발제능구여격발태FL발생유효적전자/질자전이과정,산생알완기자유기활성충인발TPGDA적광취합반응,소득고화막적최종쌍건전화솔( DCf )위93%~97%,접근완전고화；이지마소( SM)급호초배( BDO)작위조인발제시TPGDA적취합속솔칙흔저,고화막적DCf 부위32%~38%.당광민제질량분수위1.0%,4-N,N'-이갑안기분갑산을지(EDAB)질량분수위1.0%시, FL/EDAB 인발TPGDA적취합동역학여상업화BP/EDAB적상동,소득고화막적DCf 균위97%.
The polymerization kinetics of tripropylene glycol diacrylate( TPGDA) was monitored by real time near infrared ( RTIR) with favone ( FL) as photosensitizer and different hydrogen donor as coinitiator. The commercial photosensitizer benzophenone( BP) was used as control. The results showed that the molar extinc-tion coefficient(εmax ) of FL was much higher than that of BP. When FL was used in combination with tertiary amine hydrogen donor ethyl 4-N,N’-dimethylaminobenzoate(EDAB), the rate of polymerization(Rp) and final double bond conversion(DCf) could reach 0.58 s-1 and 97%, respectively, which was very close to that of commercial BP/EDAB system. However, using sesamin( SM) and benzodioxole( BDO) as coinitiator for FL, the Rp and DCf were both very low, which indicated that the excited FL and tertiary amine could generate ami-noalkyl free radical species via electron/proton transfer process and initiate the efficient photopolymerization of TPGDA. More importantly, when the co-polymerizable tertiary amines such as EBERYL P115 and dimethy-laminoethyl methacrylate( DMEM) are used, the natural component characteristics of FL make it a promising photoinitiator in biomedical and food-packaging fields.