Wang Bijie, Chen Ke, Li Tianhao, Sun Xun, Liu Ming, Yang Lingwei, Hu Xiao Matthew, Xu Jian, He Liu, Huang Qing, Jiang Linbin, Song Yujie
Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.
Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Polymers (Basel). 2021 Feb 1;13(3):467. doi: 10.3390/polym13030467.
Boron-containing organosilicon polymers are widely used under harsh environments as preceramic polymers for advanced ceramics fabrication. However, harmful chemicals released during synthesis and the complex synthesis routes have limited their applications. To solve the problems, a two-component route was adopted to synthesize cross-linked boron-containing silicone polymer (CPBCS) via a solventless process. The boron content and CPBCSs' polymeric structures could be readily tuned through controlling the ratio of multifunctional boron hybrid silazane monomers (BSZ12) and poly[imino(methylsilylene)]. The CPBCSs showed high thermal stability and good mechanical properties. The CPBCS with Si-H/C=C ratio of 10:1 showed 75 wt% char yields at 1000 °C in argon, and the heat release capacity (HRC) and total heat release (THR) are determined to be 37.9 J/g K and 6.2 KJ/g, demonstrating high thermal stability and flame retardancy. The reduced modulus and hardness of CPBCS are 0.30 GPa and 2.32 GPa, respectively. The novel polysilazanes can be potentially used under harsh environments, such as high temperatures or fire hazards.
含硼有机硅聚合物作为用于先进陶瓷制造的陶瓷前驱体聚合物，在恶劣环境中得到了广泛应用。然而，合成过程中释放的有害化学物质以及复杂的合成路线限制了它们的应用。为了解决这些问题，采用了一种双组分路线，通过无溶剂工艺合成交联含硼硅聚合物（CPBCS）。通过控制多功能硼杂化硅氮烷单体（BSZ12）和聚[亚氨基（甲基硅撑）]的比例，可以很容易地调节硼含量和CPBCS的聚合物结构。CPBCS表现出高的热稳定性和良好的机械性能。Si-H/C=C比为10:1的CPBCS在氩气中1000℃时的残炭率为75 wt%，热释放能力（HRC）和总热释放（THR）分别测定为37.9 J/g K和6.2 KJ/g，显示出高的热稳定性和阻燃性。CPBCS的压缩模量和硬度分别为0.30 GPa和2.32 GPa。这种新型聚硅氮烷在高温或火灾危险等恶劣环境中具有潜在的应用价值。
