Kleine Tristan S, Nguyen Ngoc A, Anderson Laura E, Namnabat Soha, LaVilla Edward A, Showghi Sasaan A, Dirlam Philip T, Arrington Clay B, Manchester Michael S, Schwiegerling Jim, Glass Richard S, Char Kookheon, Norwood Robert A, Mackay Michael E, Pyun Jeffrey
Department of Chemistry and Biochemistry, University of Arizona, 1306 East University Boulevard, Tucson, Arizona 85721, United States.
Department of Materials Science and Engineering, University of Delaware, 201 Dupont Hall, Newark, Delaware 19716, United States.
ACS Macro Lett. 2016 Oct 18;5(10):1152-1156. doi: 10.1021/acsmacrolett.6b00602. Epub 2016 Sep 23.
The synthesis of a novel high sulfur content material possessing improved thermomechanical properties is reported via the inverse vulcanization of elemental sulfur (S) 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(sulfur-random-(1,3,5-triisopropenylbenzene)) (poly(S--TIB)) materials over a range from = 68 to 130 °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 ( > 1.75) and IR transparency to poly(S--TIB) copolymers, which offered a route to enhanced optical transmitting materials for IR thermal imaging applications with improved thermomechanical properties.
通过元素硫（S）和1,3,5-三异丙烯基苯（TIB）的反向硫化反应，报道了一种具有改进热机械性能的新型高硫含量材料的合成。该体系的一个关键特性是能够提供高度交联的热固性材料，其中使用TIB作为共聚单体能够轻松控制网络结构，并显著提高聚（硫-无规-（1,3,5-三异丙烯基苯））（聚（S-TIB））材料的玻璃化转变温度（相对于我们早期的硫共聚物），范围从68至130°C。这种方法允许在共聚物中引入高含量的硫-硫（S-S）单元，从而实现这些动态共价键的热机械断裂以及材料的热再加工，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-TIB）共聚物高折射率（>1.75）和红外透明度，这为具有改进热机械性能的红外热成像应用提供了一种增强光学传输材料的途径。
