The aim of this research was the detailed analysis and estimation of CER oligomer‐based nanocomposites for applications under extreme high temperature conditions. Thermostable nanocomposites based on cross‐linked cyanate ester resin (CER), derived from PRIMASET PT‐30 multi‐functional oligomer and doped by 0.025wt% to 10wt% epoxycyclohexyl‐functionalized polyhedral oligomeric silsesquioxane (ECH‐POSS) nanoparticles, were synthesized and characterized using TEM, mid‐, and far‐IR spectroscopy, and by DMA, DSC, CRS, and TGA techniques. At nanoparticles contents less than 1wt%, basically their molecular level dispersion in the matrix is suggested, whereas their clusters of about 20 to 30 nm in diameter were observed at 2wt% and 10wt% ECH‐POSS. In correlation with the results of structural analysis, the ambivalent influence of the nanoparticles, depending on their content, on the dynamics and properties of nanocomposites was revealed. The “constrained dynamics” effects caused by post‐curing and covalent embedding ECH‐POSS units into the matrix were registered by DMA, far‐IR spectroscopy and CRS. Highly cooperative glass transition with T_g ≈ 400°C (DMA, 1 Hz) was observed, and at the limit total suppression of glass transition could be achieved. The obvious superiority of the studied nanocomposites over the CER nanocomposites synthesized from monomeric dicyanate ester of bisphenols, especially at high temperatures, was shown.

中文翻译：

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高性能的多功能氰酸酯低聚物网络和含纳米复合物的环氧POSS：结构，动力学和性能

这项研究的目的是对在极端高温条件下应用的基于CER低聚物的纳米复合材料进行详细的分析和评估。合成并表征了基于交联氰酸酯树脂（CER）的热稳定纳米复合材料，该复合材料衍生自PRIMASET PT-30多功能低聚物，并掺杂了0.025wt％至10wt％的环氧环己基官能化的多面体低聚倍半硅氧烷（ECH-POSS）纳米颗粒使用TEM，中红外和远红外光谱以及DMA，DSC，CRS和TGA技术。当纳米粒子的含量小于1wt％时，基本上表明了它们在基质中的分子水平分散性，而在2wt％和10wt％的ECH-POSS中观察到了直径约20至30 nm的簇。与结构分析的结果相关，纳米颗粒的矛盾影响，取决于它们的含量，揭示了纳米复合材料的动力学和性质。DMA，远红外光谱和CRS记录了将ECH-POSS单元后固化和共价嵌入到基质中引起的“约束动力学”效应。与玻璃的高度合作Ť_克≈400℃（DMA，1赫兹）中观察到，在玻璃化转变的极限总抑制可以实现的。显示了所研究的纳米复合材料比由双酚的单体二氰酸酯合成的CER纳米复合材料明显的优越性，特别是在高温下。