新型巯基-丙烯酸酯体系的性能研究

Evaluation of new thiol-acrylic system

选取了3种丙烯酸酯与两种硫醇进行巯基-烯光固化反应,通过实时红外法监测各体系的反应过程,并讨论了不同样品的剪切强度、硬度和折光率等性能与配方的关系。结果表明THEIC样反应后交联密度最高,其双键转化率达到100%,剪切强度和硬度也达到最高,分别为7.95MPa和58.0;但其巯基转化率低于DCPDA样的53.54%,可能是THEIC中参与巯基-烯共聚的双键不如DCPDA多;EBDA样表现出最高的折光率,这是其共轭结构所致,PETMP样的折光率高于对应的TMMP样,说明共轭结构和硫元素含量都有利于提高折光率。

Three acrylates and two mercaptans were selected as formulations of thiol-ene photopolymerization system.RT-FT-IR was used to monitor the curing processes of different formulations.Various performances,including shear strengths,hardness and refractive index of different compounds were measured,respectively.The relationship between performances and formulations were discussed.The results showed that： THEIC sample displayed the highest crosslink density;double bond conversion reach 100%;shear strength and shore D hardness also reached highest,showing 7.95MPa and 58.0,respectively.While,the thiol conversion of THEIC sample was lower than that of DCPDA sample,which exhibited 53.54%.It could be attributed to that fewer double bond of THEIC reacted with thiol than DCPDA.EBDA sample showed the highest refractive index,led by conjugated structure.In addition,the refractive index of PET-MP sample was higher than that of TMMP.These indicated that conjugated structure and sulfur content could help to improve refractive index of samples.