Shanghai Daoqin Plastics Co., Ltd.

         tool has ultra- elastic property and resistant fatigue property light can pressure shrink material, especially is its in vast temperature degree scope/range material, is aviation aerospace, machine 械缓冲, can amount retardant and soft machine and other field/area 理想材 material. many low density polymer foam is high degree can pressure shrink, it in heavy use 时往往 easy fatigue, in polymer 玻璃化转变 and melt temperature degree 附近发生 ultra- elastic property 退化. tube/pipe research already development various heat stabilized light metal and foam material, it usually tool has most small can pressure shrink property, and in ring deformation lower performance fatigue. carbon nano tube/pipe and 石墨烯因 its tool has solid has ultra- elastic property and hot machine stability property, in recent years by used as made light amount ultra- elastic property material basic material.

         although already has related 文献报道 this category of material excellent property can, this as and complex equipment and made process make its can made mm grade dimensions material. 另一方面, in from 几 100 million year 进化而 complex structure material material its excellent force property can 而备受关注, however due to it is pure has machine or has machine /无 machine composite/compounding structure, usually combined very narrow temperature degree scope/range inner as. therefore, will this non heat stabilized structure material material is tool has solid has structure heat stabilized 石墨材 material, has 望创造出 hot force stability material.

         most 近, China technology large 学俞书宏团队 and 梁海伟课题组报道 一 types through hot understanding chemical control, will structure material material (BC, fine fiber 素) hot is carbon nano fiber gas 凝胶(CNFAs) methods. its made carbon gas 凝胶完美 继承 fine fiber from macro to micro structure, tool has significantly hot mechanical properties. especially is in 经历2×106次 pressure shrink ring rear still can maintain ultra- elastic property 而不发生塑 property deformation, in less -100~500℃ large scope/range temperature degree scope/range inner tool has excellent temperature degree ultra- elastic property and resistant fatigue property can. this type of gas in hot machine stability property and resistant fatigue property can ratio polymer/macromolecule foam, metal foam and foam has advantages, achieve large combined formed, tool has material material advantages. related formed 果以Temperature-Invariant Superelastic and Fatigue Resistant Carbon Nanofiber Aerogels table/sheet 于《先进材 material 》(Adv. Mater.)期刊 upper.

        该团队 development types utilizing machine salt for fine fiber 素(BC)进行 hot understanding chemical methods, achieve large combined formed, 形态保留 carbon new process, made carbon nano fiber gas relatively good fine fiber from macro to micro structure, in relatively wide temperature degree scope/range inner performance obvious temperature degree ultra- elastic property and resistant fatigue property can. due to carbon nano fiber gas tool has excellent heat stabilized mechanical properties can achieve amount made 备, in more field/area will tool has important application outlook/prospects, especially is combined conditions lower machine 械缓冲, pressure 传感, can amount retardant and aerospace solar energy battery and other.

         related research to 国家自然科学基金委 innovation research 群体, 国家自然科学基金 focus/key point project, in front 沿科学 focus/key point research project, in nano 科学卓越 innovation in 心, nano 科技协同 innovation in and other 资助.

        图1, macro dimensions CNFAs combined formed. (a)CNFAs manufacturing process 示意图;(b) pure BC and BC浸渍NH4H2PO4, (NH4)2SO4, NH4Cl, (NH4)3PO4, NaH2PO4 or KH2PO4 TG曲线;(c) pure BC and BC浸渍 different concentrated degree NH4H2PO4 rear TG曲线;(d)以 pure BC and BC is raw materials, in 800°C lower add different amount NH4H2PO4炭化 made 备CNFAs(NH4H2PO4 weight ratio separation is 0.5, 4.8, 16, 44 and 62 wt%);(e)1200 ℃ lower made CNFAs density and conductive property;(f ~g) in 800℃ lower made CNFAs照 sheet/slice, show/display its can large made 备.

        图2, CNFAs in T = -100~500℃时N2 in hot force stability force property can. (a~c)形变 is 20%, 40%, 60% and 80%时CNFAs pressure shrink force -应变曲线, temperature degree separation is: a)-100 °C, b)25 °C and c)500 °C;(d)CNFAs in T = -100-500℃时 viscous elastic property (储存 modulus, loss consumption modulus and retardant ratio);(e)CNFA, poly amine, PU and EPE foam modulus temperature degree 变化;(f) different temperature degree lower CNFAs in 1×105次循 ring in modulus and loss consumption modulus.