Processing of Graphene Oxide Integrated Cellulose Acetate Composites and their Physical and Mechanical Properties
Yen, Md Asifuzzaman (2019)
Yen, Md Asifuzzaman
2019
Materials Engineering
Tekniikan ja luonnontieteiden tiedekunta - Faculty of Engineering and Natural Sciences
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Hyväksymispäivämäärä
2019-04-12
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201903261338
https://urn.fi/URN:NBN:fi:tty-201903261338
Tiivistelmä
This thesis work deals with the fabrication of bionanocomposite films composed of cellulose acetate (CA) biopolymer and graphene oxide (GO) by melt extrusion process. Desired amount of triethyl citrate (TEC) was used as a plasticizer to produce flexible CA and CA/GO composite films. The GO 0.25, GO 0.5 and GO 0.65 composite samples were fabricated, where the numbers presented after GO indicate the weight % of GO with respect to CA. The TEC plasticized CA polymer film was also manufactured in similar way without using any GO for comparison purpose. GO was produced by the oxidation of graphite using modified Hummers method and used as a nano filler for composite manufacturing. Structural, thermal and mechanical properties of the TEC plasticized CA and CA/GO composite films were also explored in this thesis. Fourier Transform Infrared Spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC) study of the composite films confirm the presence of the interfacial interaction between the GO and CA polymer chain. Wide Angle X-ray Scattering (WAXS) results and Scanning Electron Microscopy (SEM) images demonstrate that GO sheets are well dispersed into the CA matrix in GO 0.25 and GO 0.50 composite films, whereas prominent agglomeration of the GO sheets in CA matrix was observed in GO 0.65 composite film. Isothermal Thermogravimetric Analysis (TGA) curves show the lower mass loss of the composite films compared to the TEC plasticized CA film. Mechanical testing results show a noticeable increase of tensile strength and Young’s modulus in the TEC plasticized CA/GO composite films compared to the TEC plasticized CA film.