Structure And Performance Of PEGylated Graphene Oxide/polymer Composite Membrane

Composite films based on graphene have shown great potential in many fields due to its excellent mechanical properties and thermal stability.However,the current research on graphene has reached an innovative stage,that is,an innovative method for processing graphene composite film to produce the novel structure with excellent properties is urgently neededIn addition,for composite materials reinforced by fillers based on graphene,further research is needed on the enhancement mechanism,the interaction between the filler and the matrix interface,and the interfacial stress transfer.Two types of G-P/polymer composite films were prepared based on G-P,a PEG-functionalized graphene oxide using polyethylene glycol methacrylate.Firstly,the G-P/comb-like polymer composite film was successfully prepared by the combination method of droplet coating and layer-by-layer self-assembly.The composite film is carefully characterized by Fourier transform infrared spectroscopy(FT-IR),differential scanning calorimetry(DSC),X-ray diffractometry(XRD),and field-emission scanning electron microscopy(FE-SEM)techniques.The results show that the prepared composite film,presenting obvious"sandwich"structure,has enhanced interfacial adhesion and excellent cycle stability.At the same time,the addition of polymer layer gives the composite films a new characteristic of thermal storage,and these enthalpy values vary from 10 to 66 J g-1.In addition,the water flux of the composite films showed temperature sensitivity with temperature changes.Secondly a series of G-P/poly(butylene terephthalate)(PBT)composite films were fabricated through the solution blending with a varied contents of G-P nanofillers.Morphology,thermal behavior and mechanical properties of G-P/PBT composite films are investigated through the multiple characterizationmethods.An obvious enhanced interfacial morphology for composite films and a uniform dispersion of G-P nanofillers demonstrate their good compatibility and interaction.Crystallization behavior and nucleation density of PBT are greatly improved by the introduced G-P nanofillers,and it reaches maximum at 1.5 wt%G-P nanofillers.Tensile strength and modulus of composites films show firstly an increase,and then decrease with a varied content from 0.1 to 4.0 wt%,demonstrating the overloaded G-P nanofillers impact the stress transfer.Compared with pure PBT,the tensile strength and modulus of composite film increased by 57.6%and 117.2%,respectively.It is proved that the good dispersibility and strong interfacial interaction between G-P nanofiller and PBT matrix are the key factors for the preparation of high performance composite film.