In this work, octamercapto polyhedral oligomeric silsesquioxane (POSS-8SH) and octaphenol polyhedral oligomeric silsesquioxane (POSS-8Phenol) were successfully synthetized. POSS-8Phenol was added into the synthesis process of liquid thermoset phenolic resin (PR) to obtain POSS-modified phenolic resin (POSS-PR). Chemical structures of POSS-8SH, POSS-8Phenol, and POSS-PR were confirmed by FTIR and 1 H-NMR. TG and DTG analysis under different atmosphere showed that char yield of POSS-PR at 1,000°C increased from 58.6% to 65.2% in N 2 , which in air increased from 2.3% to 26.9% at 700°C. The maximum pyrolysis temperature in air increased from 543°C to 680°C, which meant better anti-oxidation properties. XRD results confirmed both POSS-8Phenol and POSS-PR-generated crystalline SiO 2 in air, which could explain the improvement of anti-oxidation properties. SEM showed that the POSS-PR had phase separation during curing process. Finally, carbon fiber fabric-reinforced POSS-PR (C-POSS-PR) was prepared to verify the anti-oxidation properties of POSS-PR.

中文翻译：

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多面体低聚倍半硅氧烷（POSS）改性的酚醛树脂：合成和抗氧化性能

在这项工作中，成功地合成了八巯基多面体低聚倍半硅氧烷（POSS-8SH）和八酚多面体低聚倍半硅氧烷（POSS-8Phenol）。将POSS-8苯酚加入到液体热固性酚醛树脂（PR）的合成过程中，以获得POSS改性的酚醛树脂（POSS-PR）。通过FTIR和1 H-NMR确认了POSS-8SH，POSS-8苯酚和POSS-PR的化学结构。TG和DTG在不同气氛下的分析表明，在1000℃下，POSS-PR在N 2中的焦炭产率从58.6％增加到65.2％，而在700℃下，空气中的焦炭产率从2.3％增加到26.9％。空气中的最高热解温度从543°C增加到680°C，这意味着更好的抗氧化性能。XRD结果证实了POSS-8Phenol和POSS-PR在空气中生成的结晶SiO 2，这可以解释抗氧化性能的改善。SEM显示，POSS-PR在固化过程中具有相分离。最后，制备了碳纤维增强的POSS-PR（C-POSS-PR），以验证POSS-PR的抗氧化性能。