High Refractive Index Copolymers with Improved Thermomechanical Properties via the Inverse Vulcanization of Sulfur and 1,3,5-Triisopropenylbenzene
High Refractive Index Copolymers with Improved Thermomechanical Properties via the Inverse Vulcanization of Sulfur and 1,3,5-Triisopropenylbenzene
复制标题
DOI：
10.1021/acsmacrolett.6b00602
复制
发表时间：
2016-10-01
影响因子：
7.015
通讯作者：
Pyun, Jeffrey
中科院分区：
文献类型：
--
作者：
Kleine, Tristan S.;Nguyen, Ngoc A.;Pyun, Jeffrey
通过单质硫（S-8）与1，3，5-三异丙烯基苯（TIB）的反相硫化，合成了一种新型高硫材料，该材料具有良好的热机械性能。该体系的一个关键特征是能够提供高度交联的热固性材料，其中使用TIB作为共聚单体使得能够容易地控制网络结构，并在T = 68至130 ℃的范围内显著地改善聚（硫无规-（1，3，5-三异丙烯基苯））（聚（S-r-TIB））材料的玻璃化转变温度（相对于我们早期的硫共聚物）。这种方法允许在共聚物中掺入高含量的硫硫（S-S）单元，这使得这些动态共价键的热机械断裂和材料的热再加工成为可能，我们通过动态流变学表征证实了这一点。此外，高硫含量还赋予聚（S-r-TIB）共聚物高折射率（n > 1.75）和红外透明性，这提供了用于红外热成像应用的具有改进的热机械性能的增强的光透射材料的途径
The synthesis of a novel high sulfur content material possessing improved thermomechanical properties is reported via the inverse vulcanization of elemental sulfur (S-8) and 1,3,5-triisopropenylbenzene (TIB). A key feature of this system was the ability to afford highly cross-linked, thermosetting materials, where the use of TIB as a comonomer enabled facile control of the network structure and dramatically improved the glass transition temperature (relative to our earlier sulfur copolymers) of poly(sulfurrandom-(1,3,5-triisopropenylbenzene)) (poly(S-r-TIB)) materials over a range from T = 68 to 130 degrees C. This approach allowed for the incorporation of a high content of sulfur sulfur (S-S) units in the copolymer that enabled thermomechanical scission of these dynamic covalent bonds and thermal reprocessing of the material, which we confirmed via dynamic rheological characterization. Furthermore, the high sulfur content also imparted high refractive index (n > 1.75) and IR transparency to poly(S-r-TIB) copolymers, which offered a route to enhanced optical transmitting materials for IR thermal imaging applications with improved thermomechanical properties