Strong reinforcement effects in 2D cellulose nanofibril-graphene oxide (CNF-GO) nanocomposites due to GO-induced CNF ordering
Artikel i vetenskaplig tidskrift, 2020

Nanocomposites from native cellulose with low 2D nanoplatelet content are of interest as sustainable materials combining functional and structural performance. Cellulose nanofibril-graphene oxide (CNF-GO) nanocomposite films are prepared by a physical mixing-drying method, with a focus on low GO content, the use of very large GO platelets (2-45 mu m) and nanostructural characterization using synchrotron X-ray source for WAXS and SAXS. These nanocomposites can be used as transparent coatings, strong films or membranes, as gas barriers or in laminated form. CNF nanofibrils with random in-plane orientation, form a continuous non-porous matrix with GO platelets oriented in-plane. GO reinforcement mechanisms in CNF are investigated, and relationships between nanostructure and suspension rheology, mechanical properties, optical transmittance and oxygen barrier properties are investigated as a function of GO content. A much higher modulus reinforcement efficiency is observed than in previous polymer-GO studies. The absolute values for modulus and ultimate strength are as high as 17 GPa and 250 MPa at a GO content as small as 0.07 vol%. The remarkable reinforcement efficiency is due to improved organization of the CNF matrix; and this GO-induced mechanism is of general interest for nanostructural tailoring of CNF-2D nanoplatelet composites.

Författare

Hanieh Mianehrow

Kungliga Tekniska Högskolan (KTH)

Giada Lo Re

Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial

Federico Carosio

Politecnico di Torino

Alberto Fina

Politecnico di Torino

Per Tomas Larsson

Kungliga Tekniska Högskolan (KTH)

RISE Research Institutes of Sweden

Pan Chen

Kungliga Tekniska Högskolan (KTH)

Beijing Institute of Technology

Lars A. Berglund

Kungliga Tekniska Högskolan (KTH)

Journal of Materials Chemistry A

2050-7488 (ISSN)

Vol. 8 34 17608-17620

Ämneskategorier

Polymerteknologi

Materialkemi

Kompositmaterial och -teknik

DOI

10.1039/d0ta04406g

Mer information

Senast uppdaterat

2020-10-29