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‘Phoenix polymers’: fire induced nanohardness in fibril-forming aromatic cyanate esters

机译:“凤凰聚合物”:火焰诱导形成原纤维的芳族氰酸酯的纳米硬度

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For the first time we present nanoindentation analysis of charred, cured aromatic cyanate esters, which exhibit outstanding mechanical properties when analysed under applied loads of 0.1–300 mN. Following charring (900 °C for 10 minutes to achieve graphitised structures), the samples display a remarkable combination of a modulus of elasticity of around 25 GPa and nanohardness of 300 kgf mm ~(?2) , making them some 30–40% stiffer than bone and practically as hard as tooth enamel. At the same time we find that under the same conditions the chars are highly resilient, displaying complete elastic recovery with very little plastic deformation. When cured in the presence of copper( II ) acetylacetonate (200 ppm) in dodecylphenol (1% w/v active copper suspension) to form a polycyanurate, compound ( 2 ) forms a dense, consolidated structure compared with compound ( 1 ) under the same conditions. At high magnification, the presence of a nanoscale, fibrillar structure is observed, accounting for the high resilience.
机译:我们首次进行了炭化,固化的芳族氰酸酯的纳米压痕分析,当在0.1–300 mN的负载下进行分析时,其表现出出色的机械性能。炭化后(900℃10分钟以实现石墨化的结构),样品表现出显着的组合:约25 GPa的弹性模量和300 kgf mm〜(?2)的纳米硬度,使其硬度提高了30–40%比骨头和牙釉质坚硬。同时,我们发现在相同条件下,炭具有很高的回弹性,显示出完全的弹性恢复,几乎没有塑性变形。当在十二烷基苯酚(1%w / v活性铜悬浮液)中的乙酰丙酮铜(II)(200 ppm)存在下固化以形成聚氰尿酸酯时,在温度下,化合物(2)与化合物(1)相比形成致密的固结结构。相同的条件。在高放大倍率下,观察到存在纳米级的纤维状结构,这说明了高弹性。

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