kevlar wikipedia - EAS

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    Kevlar - Wikipedia

    https://en.wikipedia.org/wiki/Kevlar

    Kevlar (para-aramid) is a heat-resistant and strong synthetic fiber, related to other aramids such as Nomex and Technora. Developed by Stephanie Kwolek at DuPont in 1965, the high-strength material was first used commercially in the early 1970s as a replacement for steel in racing tires. It is typically

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    Poly-paraphenylene terephthalamide (K29) – branded Kevlar – was invented by the American chemist Stephanie Kwolekwhile working for DuPont, in anticipation of a gasoline shortage. In 1964, her group began searching for a new

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    Kevlar is synthesized in solution from the monomers 1,4-phenylene-diamine (para-phenylenediamine) and terephthaloyl chloride in a condensation reaction yielding hydrochloric acid as a byproduct. The result has liquid-crystallinebehavior, and mechanical drawing

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    When Kevlar is spun, the resulting fiber has a tensile strength of about 3,620 MPa (525,000 psi), and a relative densityof 1.44 (0.052 lb/in ). The polymer owes its high strength to the many inter

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    Science
    Kevlar is often used in the field of cryogenics for its low thermal conductivity and high strength relative to other materials for

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    Aramid fibers are widely used for reinforcing composite materials, often in combination with carbon fiber and glass fiber. The matrix for high performance composites is usually epoxy resin. Typical applications include monocoque bodies for F1 racing cars

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    Kevlar maintains its strength and resilience down to cryogenic temperatures (−196 °C (−320.8 °F)); in fact, it is slightly stronger at low temperatures. At higher temperatures the tensile strength is immediately reduced by about 10–20%, and after some hours the

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  2. Kevlar – Wikipedia tiếng Việt

    https://vi.wikipedia.org/wiki/Kevlar

    Kevlar là nhãn hiệu đăng ký cho một sợi tổng hợp para-aramid, liên quan đến aramit khác như Nomex và Technora. Được phát triển tại DuPont vào năm 1965, vật liệu cường độ cao này đã được sử dụng thương mại đầu tiên vào đầu năm 1970 như là một thay thế cho thép trong lốp ...

    • Công thức phân tử: [-CO-C₆H₄-CO-NH-C₆H₄-NH-]ₙ
  3. Kevlar — Wikipédia

    https://fr.wikipedia.org/wiki/Kevlar

    Le poly(p-phénylènetéréphtalamide) (PPD-T) est un polymère thermoplastique constitué de noyaux aromatiques séparés par des groupes amide. Il appartient à la famille des fibres d'aramides.
    Le PPD-T est commercialisé sous le nom déposé Kevlar. Ce dernier, comme les autres fibres textiles, ne fait pas partie des matières plastiques.

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  4. Kevlar - Wikipedia, la enciclopedia libre

    https://es.wikipedia.org/wiki/Kevlar
    Image
    El descubrimiento supuso un gran avance en el desarrollo de nuevos materiales poliméricos. A comienzos de los años sesenta, la compañía DuPont estaba interesada en obtener una fibra más resistente que el nailon (poliamida 6,6). Hasta entonces las soluciones empleadas para la formación de fibras eran transparente…
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    • ChEBI: 82391
    • Número CAS: 24938-64-5[1]​
    • Fórmula molecular: C₁₄H₁₄N₂O₄
  5. Kevlar - Wikipedia

    https://it.wikipedia.org/wiki/Kevlar
    • Uno degli utilizzi più noti del kevlar è nei giubbotti antiproiettile: la sua elevata resistenza è utilizzata per assorbire, tramite deformazione plastica, l'energia cinetica dei proiettili. Di questo materiale sono costruiti anche alcuni elmetti militari, ad esempio il Lightweight Helmet dei Marines. Il kevlar è utilizzato in alcuni capi antinfortunistici da lavoro. Il tessuto in kevlar è tuttavi…
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    • Thời gian đọc ước tính: 7 phút
    • Mọi người cũng hỏi
      What is kevlar made of?
      Kevlar. Kevlar is a heat-resistant and strong synthetic fiber, related to other aramids such as Nomex and Technora. Developed by Stephanie Kwolek at DuPont in 1965, this high-strength material was first commercially used in the early 1970s as a replacement for steel in racing tires.
      en.wikipedia.org/wiki/Kevlar
      What is Kevlar tires?
      Kevlar (para-aramid) is a heat-resistant and strong synthetic fiber, related to other aramids such as Nomex and Technora. Developed by Stephanie Kwolek at DuPont in 1965, the high-strength material was first used commercially in the early 1970s as a replacement for steel in racing tires.
      en.wikipedia.org/wiki/Kevlar
      When was Kevlar first used in cars?
      Kevlar. Developed by Stephanie Kwolek at DuPont in 1965, this high-strength material was first commercially used in the early 1970s as a replacement for steel in racing tires. Typically it is spun into ropes or fabric sheets that can be used as such or as an ingredient in composite material components.
      en.wikipedia.org/wiki/Kevlar
      What is Kevlar used for in the military?
      The PASGT helmet and vest used by United States military forces, use Kevlar as a key component in their construction. Other military uses include bulletproof face masks and spall liners used to protect the crews of armoured fighting vehicles.
      en.wikipedia.org/wiki/Kevlar
    • Kevlar – Wikipedia

      https://sv.wikipedia.org/wiki/Kevlar

      Kevlar är ett handelsnamn för para-aramidfiber.Fibern är fem gånger starkare än stål i samma vikt. Den påverkas dessutom inte inom rimliga temperaturintervall av värme. Kevlar används till allt från skyddshandskar och -västar till slangar i bildäck och kompositer i flygplan men också mycket inom modellhobby.

    • Kevlar – Wikipedia

      https://de.wikipedia.org/wiki/Kevlar?redirect=no

      Der Text ist unter der Lizenz „Creative Commons Attribution/Share Alike“ verfügbar; Informationen zu den Urhebern und zum Lizenzstatus eingebundener Mediendateien (etwa Bilder oder Videos) können im Regelfall durch Anklicken dieser abgerufen werden. Möglicherweise unterliegen die Inhalte jeweils zusätzlichen Bedingungen. Durch die Nutzung dieser Website erklären Sie sich …

    • Kevlar – Wikipédia, a enciclopédia livre

      https://pt.wikipedia.org/wiki/Kevlar

      Kevlar é a marca registada da DuPont para uma fibra sintética de aramida muito resistente e leve. Trata-se de um polímero resistente ao calor e cinco vezes mais resistente que o aço por unidade de peso. O kevlar é usado na fabricação de cintos de segurança, cordas, construções aeronáuticas, velas, coletes à prova de bala, linhas de pesca, de alguns modelos de raquetes …

    • Kevlar - Wikipedia

      https://ro.wikipedia.org/wiki/Kevlar

      De la Wikipedia, enciclopedia liberă. Kevlarul a fost inventat în 1965 de către compania DuPont ( SUA ), și introdus pe piață în 1970. Kevlar-ul este o amidă cu proprietăți mecanice deosebite, fiind de 5 ori mai rezistentă decât oțelul, considerat la o greutate egală. Pentru aceste considerente, Kevlar-ul a fost prima fibră ...

    • Kevlar – Wikipédia

      https://sk.wikipedia.org/wiki/Kevlar

      Kevlar je para-aramidové vlákno, ktoré vyvinula firma DuPont v roku 1965. Pôvodne malo slúžiť ako náhrada oceľových výstuží v pretekárskych pneumatikách počas 70-tych rokov. Vďaka vysokej pevnosti pri zachovaní nízkej hmotnosti nachádza kevlar uplatnenie aj inde, napr.



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