4.7 Article

Modified TiO2@graphene oxide and montmorillonite synergistically enhanced multifunctional nanocomposite films

Journal

POLYMER COMPOSITES
Volume 42, Issue 5, Pages 2511-2522

Publisher

WILEY
DOI: 10.1002/pc.25996

Keywords

flame retardant; gas barrier; graphene oxide; montmorillonite; polyvinyl alcohol

Funding

  1. Fundamental Research Funds for the Central Universities [222201718002]
  2. Innovation Program of Shanghai Municipal Education Commission
  3. National Natural Science Foundation of China [21838003, 21878092, 51621002, 91834301]
  4. Program of Shanghai Academic Research Leader [19XD1401400]
  5. Shanghai Scientific and Technological Innovation Project [18JC1410500, 19JC1410400]

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By adding modified TiO2@graphene oxide/montmorillonite fillers, a polyvinyl alcohol-based nanocomposite film with excellent gas barrier, flame retardant, and mechanical properties is fabricated, showing potential applications in packaging and coating industries.
The application of polymers in packaging is still limited due to the problems of poor gas barrier and flame retardant properties. Herein, a modified TiO2 (m-TiO2)@graphene oxide (GO)/montmorillonite (MMT) filler-reinforced polyvinyl alcohol (PVA)-based nanocomposite films with excellent gas barrier, flame retardant, and mechanical properties is fabricated through a simple method of solution casting. In this system, GO and MMT act as bricks, PVA sticks them together like glue, and they together form a brick-wall structure. By adding these fillers, the oxygen permeability rate (Po-2) of this film is 0.48 x 10(-18) cm(3)center dot cm/(cm(2)center dot s center dot Pa), less than that of pure PVA film by 97%, and the water vapor permeability rate (PH2O) of the nanocomposite film is 1.21 x 10(-13) g center dot cm/(cm(2)center dot s center dot Pa), less than that of pure PVA film by 86%. In addition, the flame retardant properties of m-TiO2@GO/MMT/PVA nanocomposite films are excellent, which self-extinguishes as long as the flame taken away, different from pure PVA film, which is completely burned. Moreover, the thermal stability and mechanical properties of the nanocomposite films are also significantly improved. The nanocomposites with environment-friendly raw materials, simple manufacturing processes, and excellent performance should have good applications in the packaging and coating industries.

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