Thiol−Isocyanate−Ene Ternary Networks by Sequential and Simultaneous Thiol Click Reactions
作者:Junghwan Shin、Hironori Matsushima、Christopher M. Comer、Christopher N. Bowman、Charles E. Hoyle
DOI:10.1021/cm903856n
日期:2010.4.27
real-time IR indicate that both thiol−isocyanate and thiol−ene reactions were quantitatively rapid and efficient (>90% of conversion in a matter of minutes and seconds, respectively). The Tg of the thiourethane/thiol−ene hybrid networks progressively increases (−5 to 35 °C by DSC) as a function of the thiourethane content due to the higher extent of hydrogen bonding, also resulting in enhanced mechanical properties
制备了具有系统性变化(100/100 / 0、100 / 80 / 20、100 / 60 / 40、100 / 40 / 60、100 / 20/80和100/0/100)的巯基-异氰酸酯-烯三元网络通过顺序和同时进行的硫醇-烯和硫醇-异氰酸酯的点击反应。热或光解引发硫醇-异氰酸酯偶联反应,以控制硫醇-烯光聚合反应的顺序。三乙胺(TEA)和2,2-二甲氧基-2-苯基苯乙酮(DMPA)分别用于顺序热诱导的硫醇-异氰酸酯偶联和光化学引发的硫醇-烯反应。热稳定的光潜碱催化剂(三丁胺·四苯基硼酸盐,TBA·HBPh 4能够通过紫外光原位生成三丁胺的溶液与异丙基硫杂蒽酮(ITX)一起用于同时的硫醇-异氰酸酯/硫醇-烯固化体系。使用实时红外技术研究的混合网络的动力学表明,硫醇-异氰酸酯和硫醇-烯反应在定量上是快速而有效的(分别在几分钟和几秒钟内转化率达到了90%以上)。的Ť克由于较高程度的氢键作用,