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

机译:“凤凰聚合物”:火灾诱导的原纤维形成芳族氰酸酯中的纳急性

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摘要

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 degrees 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:我们首次呈现烧制的芳烃氰酸酯的纳米indentation分析,当在施加载荷为0.1-300mn的施加载量时表现出出色的机械性能。在Charring之后(900摄氏度10分钟实现石墨的结构),样品显示出约25gPa和300kgF mm(-2)的纳米型癌的弹性模量的显着组合,使其比其更硬于30-40%骨头,几乎难以牙釉质。同时发现,在相同的条件下,该字符具有高度弹性,呈现完全弹性恢复,具有非常小的塑性变形。当在铜(II)烷基丙酮(200ppm)的存在下固化十二烷基苯酚(1%w / v活性铜悬浮液)以形成多囊氰酸盐时,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。在高倍率下,观察纳米级,纤维状结构的存在,占高弹性。

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  • 来源
    《RSC Advances》 |2018年第63期|共8页
  • 作者单位

    Dept Chem Guildford GU2 7XH Surrey England;

    Dept Chem Guildford GU2 7XH Surrey England;

    Dept Chem Guildford GU2 7XH Surrey England;

    Univ Surrey Fac Engn &

    Phys Sci Dept Phys Guildford GU2 7XH Surrey England;

    Cranfield Univ Cranfield Forens Inst CDS Shrivenham England;

    Dstl Salisbury SP4 0JQ Wilts England;

    Dstl Salisbury SP4 0JQ Wilts England;

    Dept Chem Guildford GU2 7XH Surrey England;

    Univ Bristol Bristol Composites Inst ACCIS Dept Aerosp Engn Sch Civil Aerosp &

    Mech Engn Queens Bldg Univ Walk Bristol BS8 1TR Avon England;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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