• 文献标题:   Isocyanate-functionalised graphene oxide and poly(vinyl alcohol) nacre-mimetic inspired freestanding films
  • 文献类型:   Article
  • 作  者:   SMITH AJ, FIGIEL L, WAN CY, MCNALLY T
  • 作者关键词:  
  • 出版物名称:   NANOSCALE ADVANCES
  • ISSN:   2516-0230
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1039/d1na00792k EA NOV 2021
  • 出版年:   2021

▎ 摘  要

Nacre mimetic films based on 2-ureido-4[1H]-pyrimidinone (UPy) functionalised graphene oxide (GO) and poly(vinyl alcohol) (PVA) were readily prepared by self-assembly using a vacuum filtration method. The isocyanate (UPy) functionalisation of the PVA was confirmed from a combination of Fourier transform infrared spectroscopy (FTIR) and changes in d-spacing from X-ray diffraction (XRD) measurements and, of the GO by solid-state NMR measurements reported by the authors previously. This is the first example of nacre mimetic structures where both the nanoplatelet (GO) and polymer (PVA) components are functionalised with complimentary groups. The resulting films displayed substantial increases in Young's modulus (E) of 392% (GO1/PVA1), ultimate tensile strength (UTS, sigma) of 535% (GO1/PVA1), elongation at break (epsilon(max)) of 598% (GO10/PVA5) and tensile toughness (U-T) of 1789% (GO1/PVA10) compared to the un-functionalised GO analogues. The binding of UPy to both the GO and the PVA provides multiple routes by which these freestanding nacre mimetic films can dissipate applied loads.