CAJ | 학술논문

用光DSC（DPC）考察了三种聚氨酯丙烯酸酯（PUA）预聚物，即传统的、扩链的以及接枝的PUA的光固化动力学行为。讨论了不同的反应条件对三种PUA的光固化动力学的影响。利用DPC数据计算出反应速率与各种影响因素的指数关系。预聚物的引发剂指数均小于0.5。对于传统的和扩链的PUA，光强指数稍低于0.5，单体浓度指数近似于1，而对于接枝PUA则分别为0.56～0.68和1.25。在恒定光强和引发速率条件下反应速率与转化率的关系算出kp/kt1/2，在非稳态条件下反应速率对时间的关系算出kt/kp，可以求出kp和kt值。结果表明，体系的凝胶效应使kp和kt随转化率增加而大大下降。
용광DSC（DPC）고찰료삼충취안지병희산지（PUA）예취물，즉전통적、확련적이급접지적PUA적광고화동역학행위。토론료불동적반응조건대삼충PUA적광고화동역학적영향。이용DPC수거계산출반응속솔여각충영향인소적지수관계。예취물적인발제지수균소우0.5。대우전통적화확련적PUA，광강지수초저우0.5，단체농도지수근사우1，이대우접지PUA칙분별위0.56～0.68화1.25。재항정광강화인발속솔조건하반응속솔여전화솔적관계산출kp/kt1/2，재비은태조건하반응속솔대시간적관계산출kt/kp，가이구출kp화kt치。결과표명，체계적응효효응사kp화kt수전화솔증가이대대하강。
The curing kinetics was found to be affected by various factors，such as photoinitiator concentration and incident light intensity.The power dependence of reaction rate on various parameters had been determined from DPC data.The exponent of initiator concentration for all the prepolymers was found to be less than 0.5.For conventional and chain-extended PUA，the exponent of incident light intensity was slightly less than 0.5 and that of monomer concentration was close to unity，compared with grafted PUA，it was 0.56～0.68 and 1.25 respectively.The ratio k\-p/k\-t1/2 was calculated from rate vs.conversion data under constant irradiation.while the ratio k\-p/k\-t was obtained from the analysis of rate vs.time data under non-steady state.Consequently，the k\-p and k\-t could be individually calculated.Both k\-p and k\-t were found to substantially decrease with couversion due to the gelation of the sticky system.