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Nonstop Monomer-to-...
Nonstop Monomer-to-Aramid Nanofiber Synthesis with Remarkable Reinforcement Ability
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- Koo, Jun Mo (författare)
- KTH,Fiber- och polymerteknologi
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- Kim, Hojun (författare)
- KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.
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- Lee, Minkyung (författare)
- KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.
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- Park, Seul-A (författare)
- KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.
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- Jeon, Hyeonyeol (författare)
- KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.
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- Shin, Sung-Ho (författare)
- KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.
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- Kim, Seon-Mi (författare)
- KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.
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- Cha, Hyun Gil (författare)
- KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.
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- Jegal, Jonggeon (författare)
- KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.
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- Kim, Byeong-Su (författare)
- Yonsei Univ, Dept Chem, Seoul 03722, South Korea.
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- Choi, Bong Gill (författare)
- Kangwon Natl Univ, Dept Chem Engn, Samcheok 25913, Gangwon Do, South Korea.
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- Hwang, Sung Yeon (författare)
- KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.;UST, Adv Mat & Chem Engn, Daejeon 34113, South Korea.
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- Oh, Dongyeop X. (författare)
- KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.;UST, Adv Mat & Chem Engn, Daejeon 34113, South Korea.
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- Park, Jeyoung (författare)
- KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.;UST, Adv Mat & Chem Engn, Daejeon 34113, South Korea.
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(creator_code:org_t)
- 2019-01-17
- 2019
- Engelska.
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Ingår i: Macromolecules. - : American Chemical Society (ACS). - 0024-9297 .- 1520-5835. ; 52:3, s. 923-934
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Aramid nanofibers (ANFs), typically produced by exfoliating aramid microfibers (Kevlar) in alkaline media, exhibit excellent mechanical properties and have therefore attracted increased attention as nanoscale building blocks. However, the preparation of aramid microfibers involves laborious and hazardous processes, which limits the industrial-scale use of ANFs. This work describes a facile and direct monomer-to-ANF synthesis via an as-synthesized intermediate low-molecular-weight poly(p-phenylene terephthalamide) (PPTA) without requiring the environmentally destructive acids and high-order shearing processes. Under the employed conditions, PPTA immediately dissociates and self-assembles into ANFs within a time period of 15 h, which is much shorter than the time of 180 h (not including the Kevlar preparation time) required for the Kevlar-to-ANF conversion. Interestingly, the fabricated ANFs exhibit nanoscale dimensions and thermoplastic polyurethane (TPU) reinforcing effects similar to those of Kevlar-derived ANFs; i.e., a 1.5-fold TPU toughness improvement and a maximum ultimate tensile strength of 84 MPa are achieved at an ANF content of only 0.04 wt %. Remarkable reinforcement ability investigated by comprehensive analytical data comes from ANFs, which disturb ordered hydrogen bonding in hard segments and induce strain hardening along the elongation pathway. Thus, the developed approach paves the way to industrial-scale production of ANFs and related nanocomposites.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
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- art (ämneskategori)
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Koo, Jun Mo
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Kim, Hojun
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Lee, Minkyung
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Park, Seul-A
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Jeon, Hyeonyeol
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Shin, Sung-Ho
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visa fler...
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Kim, Seon-Mi
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Cha, Hyun Gil
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Jegal, Jonggeon
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Kim, Byeong-Su
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Choi, Bong Gill
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Hwang, Sung Yeon
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Oh, Dongyeop X.
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Park, Jeyoung
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Kemi
- Artiklar i publikationen
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Macromolecules
- Av lärosätet
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Kungliga Tekniska Högskolan