Počet záznamů: 1  

Aqueous-based functionalizations of titanate nanotubes: a straightforward route to high-performance epoxy composites with interfacially bonded nanofillers

  1. 1.
    0492561 - ÚMCH 2019 RIV US eng J - Článek v odborném periodiku
    Beneš, Hynek - Popelková, Daniela - Šturcová, Adriana - Popelka, Štěpán - Jůza, Josef - Pop-Georgievski, Ognen - Konefal, Magdalena - Hrubý, Martin
    Aqueous-based functionalizations of titanate nanotubes: a straightforward route to high-performance epoxy composites with interfacially bonded nanofillers.
    Macromolecules. Roč. 51, č. 15 (2018), s. 5989-6002. ISSN 0024-9297. E-ISSN 1520-5835
    Grant CEP: GA ČR(CZ) GA17-08273S; GA MŠMT(CZ) LO1507
    Institucionální podpora: RVO:61389013
    Klíčová slova: titanate nanotube * surface modification * epoxy kinetics
    Obor OECD: Polymer science
    Impakt faktor: 5.997, rok: 2018

    Nanotube surface treatment is crucial in preparation of high-quality nanomaterials for advanced applications. Herein, we provide an environmentally friendly and practical route to the design of high performance composites using the surface chemistry of titanate nanotubes (TiNT) to enhance the interfacial nanotube-epoxy bonding. Insights presented here improve understanding of how different organic layers (a low-molecular-weight bisphosphonate (APMBP), branched polyethylenimine (PEI), or polydopamine (PDA)) coated on TiNT surface and bearing active hydrogen functionalities (NH, OH) affect epoxy-amine cross-link reaction and network buildup and consequently morphology and thermomechanical properties of the final epoxy-TiNT composites. The kinetics of cross-linking was experimentally studied and successfully fitted by a mechanistic kinetic model, which considered the effects of NH and OH functionalities. We found that APMBP was not involved in the epoxy-amine cross-link reaction entering only into physical interactions with epoxy precursors, while the PEI and PDA modifications of TiNT accelerated cross-linking and formed covalent linkages with the epoxy network. All functionalizations improved dispersion of TiNT in the epoxy-amine matrix. The prepared epoxy/TiNT composites showed a dramatic increase in the rubbery storage modulus (up to +92%) and an excellent thermal stability with the onset degradation temperature of proximately 400 °C. This study demonstrates that TiNT functionalized with fully aqueous-based protocols are promising alternatives to carbon nanotubes in epoxy composites.
    Trvalý link: http://hdl.handle.net/11104/0286155

     
     
Počet záznamů: 1  

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