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  • 1.
    Koo, Jun Mo
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Kim, Hojun
    KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Lee, Minkyung
    KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Park, Seul-A
    KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Jeon, Hyeonyeol
    KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Shin, Sung-Ho
    KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Kim, Seon-Mi
    KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Cha, Hyun Gil
    KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Jegal, Jonggeon
    KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Kim, Byeong-Su
    Yonsei Univ, Dept Chem, Seoul 03722, South Korea..
    Choi, Bong Gill
    Kangwon Natl Univ, Dept Chem Engn, Samcheok 25913, Gangwon Do, South Korea..
    Hwang, Sung Yeon
    KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.;UST, Adv Mat & Chem Engn, Daejeon 34113, South Korea..
    Oh, Dongyeop X.
    KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.;UST, Adv Mat & Chem Engn, Daejeon 34113, South Korea..
    Park, Jeyoung
    KRICT, Res Ctr Biobased Chem, Ulsan 44429, South Korea.;UST, Adv Mat & Chem Engn, Daejeon 34113, South Korea..
    Nonstop Monomer-to-Aramid Nanofiber Synthesis with Remarkable Reinforcement Ability2019In: Macromolecules, ISSN 0024-9297, E-ISSN 1520-5835, Vol. 52, no 3, p. 923-934Article in journal (Refereed)
    Abstract [en]

    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.

  • 2.
    Moon, Hyunwoo
    et al.
    Pohang Univ Sci & Technol POSTECH, Div Environm Sci & Engn, 77 Chengam Ro, Pohang 37673, South Korea..
    Choy, Seunghwan
    Pohang Univ Sci & Technol POSTECH, Div Integrat Biosci & Biotechnol, 77 Chengam Ro, Pohang 37673, South Korea..
    Park, Yeonju
    Kangwon Natl Univ, Inst Mol Sci & Fus Technol, Dept Chem, Chunchon 24341, South Korea..
    Jung, Young Mee
    Kangwon Natl Univ, Inst Mol Sci & Fus Technol, Dept Chem, Chunchon 24341, South Korea..
    Koo, Jun Mo
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Hwang, Dong Soo
    Pohang Univ Sci & Technol POSTECH, Div Environm Sci & Engn, 77 Chengam Ro, Pohang 37673, South Korea.;Pohang Univ Sci & Technol POSTECH, Div Integrat Biosci & Biotechnol, 77 Chengam Ro, Pohang 37673, South Korea..
    Different Molecular Interaction between Collagen and alpha- or beta-Chitin in Mechanically Improved Electrospun Composite2019In: Marine Drugs, ISSN 1660-3397, E-ISSN 1660-3397, Vol. 17, no 6, article id 318Article in journal (Refereed)
    Abstract [en]

    Although collagens from vertebrates are mainly used in regenerative medicine, the most elusive issue in the collagen-based biomedical scaffolds is its insufficient mechanical strength. To solve this problem, electrospun collagen composites with chitins were prepared and molecular interactions which are the cause of the mechanical improvement in the composites were investigated by two-dimensional correlation spectroscopy (2DCOS). The electrospun collagen is composed of two kinds of polymorphs, alpha- and beta-chitin, showing different mechanical enhancement and molecular interactions due to different inherent configurations in the crystal structure, resulting in solvent and polymer susceptibility. The collagen/alpha-chitin has two distinctive phases in the composite, but beta-chitin composite has a relatively homogeneous phase. The beta-chitin composite showed better tensile strength with similar to 41% and similar to 14% higher strength compared to collagen and alpha-chitin composites, respectively, due to a favorable secondary interaction, i.e., inter- rather than intra-molecular hydrogen bonds. The revealed molecular interaction indicates that beta-chitin prefers to form inter-molecular hydrogen bonds with collagen by rearranging their uncrumpled crystalline regions, unlike alpha-chitin.

  • 3.
    Shin, Sung-Ho
    et al.
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Lee, Woojoo
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Kim, Seon-Mi
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Lee, Minkyung
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
    Koo, Jun Mo
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Hwang, Sung Yeon
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea.;Univ Sci & Technol, Adv Mat & Chem Engn, Daejeon 34113, South Korea..
    Oh, Dongyeop X.
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea.;Univ Sci & Technol, Adv Mat & Chem Engn, Daejeon 34113, South Korea..
    Park, Jeyoung
    Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea.;Univ Sci & Technol, Adv Mat & Chem Engn, Daejeon 34113, South Korea..
    Ion-conductive self-healing hydrogels based on an interpenetrating polymer network for a multimodal sensor2019In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 371, p. 452-460Article in journal (Refereed)
    Abstract [en]

    Conductive self-healing polymer hydrogel and related soft sensor devices are receiving considerable attention from academia to industry because of their impacts on the lifetime and ergonomic design of soft robotics, prosthesis, and health monitoring systems. However, the development of such a material has thus far been limited considering performances and accessibility. Herein, robustness, self-healing, and conductivity for soft electronic skin are realized by an interpenetrating polymer network (IPN) system based on chemical/ionic cross-inked poly(acrylic acid) containing ferric ions, intercalated with physically cross-linked poly(vinyl alcohol). This IPN hydrogel successfully satisfies all three aforementioned capabilities; elongation at break greater than 1400%; recovery to original mechanical properties greater than 80% after 24 h; and 0.14 Sm-1 of ionic conductivity, which is electrically healable. Such ionic conductivity of hydrogels enables multimodal sensing capabilities, i.e., for strain, pressure, and temperature. Particularly, a uniquely designed dual sensor attached to a finger simultaneously detects mechanical folding and pressure changes independently and can undergo large deformation 1000 times repeated and heating up to 90 degrees C.

1 - 3 of 3
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