Influence of expanded graphite (EG) and graphene oxide (GO) on physical properties of PET based nanocomposites (original) (raw)
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Graphene–based fillers have been used in polymer nanocomposites and hold potential for a variety of possible applications. To achieve large property enhancements in their nanocomposites, layered materials such as GO must be exfoliated and well dispersed in the polymer matrix. Among other methods, in situ polymerization might offer superior dispersion of this filler [1]. Nanocomposites based on poly(ethylene terephthalate) (PET) and graphite oxide (GO, 5μm) were synthesised by melt transesterification and subsequently polycondensation as follows [2]. Covalent functionalization of exfoliated GO has been used in an effort to compatibilize the filler with polymer hosts for improved dispersion. Morphology of the nanocomposites has been examined by electronic microscopy (SEM, TEM). Using of SAXS and DSC methods, the nanostructure of PET/GO nanocomposites and neat PET was investigated in real time in the process of crystallization from the melt. The correlation function approach was used t...
Journal of Nanomaterials, 2015
Poly(ethylene terephthalate) nanocomposites with low loading (0.1–0.5 wt%) of graphene oxide (GO) have been prepared by usingin situpolymerization method. TEM study of nanocomposites morphology has shown uniform distribution of highly exfoliated graphene oxide nanoplatelets in PET matrix. Investigations of oxygen permeability of amorphous films of nanocomposites showed that the nanocomposites had better oxygen barrier properties than the neat PET. The improvement of oxygen permeability for PET nanocomposite films over the neat PET is approximately factors of 2–3.3. DSC study on the nonisothermal crystallization behaviors proves that GO acts as a nucleating agent to accelerate the crystallization of PET matrix. The evolution of the lamellar nanostructure of nanocomposite and neat PET was monitored by SAXS during nonisothermal crystallization from the melt. It was found that unfilled PET and nanocomposite with the highest concentration of GO (0.5 wt%) showed almost similar values of t...
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