Inverse Vulcanization Polymers with Enhanced Thermal Properties via Divinylbenzene Homopolymerization-Assisted Cross-Linking,ACS Macro Letters

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Inverse Vulcanization Polymers with Enhanced Thermal Properties via Divinylbenzene Homopolymerization-Assisted Cross-Linking
ACS Macro Letters ( IF 5.1 ) Pub Date : 2019-12-09 , DOI: 10.1021/acsmacrolett.9b00827
Sangwoo Park ₁ , Duhwan Lee ₂ , Hongkwan Cho ₂ , Jeewoo Lim ₃ , Kookheon Char ₁

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High-refractive-index sulfur-rich polymers with significantly improved thermal properties are prepared using divinylbenzene (DVB) as a comonomer in a modified, low-temperature inverse vulcanization with elemental sulfur. Differential scanning calorimetry and Fourier transform infrared studies reveal that under the modified inverse vulcanization conditions, homopolymerized DVB segments form, leading to high glass-transition temperatures (T_g > 100 °C) and thermal stability previously unattainable from the inverse vulcanization of bifunctional olefin comonomers. On the basis of the modified procedures, a three-step molding process of the inverse vulcanization product of DVB, poly(S-r-DVB), involving (1) prepolymer formation, (2) hot-press compression molding of the soft prepolymer, and (3) thermal annealing of the molded product is demonstrated. The molded high-sulfur-content poly(S-r-DVB) exhibits a high refractive index (n > 1.85), along with high midwave infrared transmittance. Combined with a high T_g, these properties render poly(S-r-DVB) with properties highly desirable in applications involving infrared optics.

中文翻译：

通过二乙烯基苯均聚辅助交联提高热性能的反硫化聚合物

使用二乙烯基苯 (DVB) 作为共聚单体，在与元素硫的改性低温逆硫化中制备具有显着改善的热性能的高折射率富硫聚合物。差示扫描量热法和傅里叶变换红外研究表明，在改进的逆硫化条件下，形成均聚的 DVB 链段，导致双官能烯烃共聚单体逆硫化以前无法达到的高玻璃化转变温度（ T _g > 100 °C）和热稳定性. 在改进程序的基础上，DVB反硫化产品poly(S -r )的三步成型工艺-DVB)，涉及 (1) 预聚物的形成，(2) 软质预聚物的热压压缩成型，以及 (3) 成型产品的热退火。模塑的高硫含量聚 (S- r - DVB) 具有高折射率 ( n > 1.85)，以及高中波红外透射率。结合高T _g，这些特性使 poly(S -r -DVB) 在涉及红外光学的应用中具有非常理想的特性。

更新日期：2019-12-11

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