Water‐borne reduced graphene oxide (rGO)/polymer composites have been synthesized by emulsion mixing and in situ polymerization. The main challenge is to synthesize colloidally stable hybrid latexes that are able to produce composite films by water evaporation at standard atmospheric conditions for their possible application as electrically conductive coatings. The selected polymer system is composed from poly(methyl metacrylate/butyl acrylate) in 50/50 wt% ratio in order to obtain glass transition temperature of the final film lower than the room temperature. The polymer is joined with rGO stable dispersions, which are prepared by reduction of GO in the presence of polyvynil pyrrolidone (PVP). The latex blends are composed of weakly bonded rGO platelets with polymer particles by the presence of PVP, whereas the covalent bonds between the polymers and the rGO in the in situ hybrid latexes are established. Both procedures result in stable hybrid latexes, from which layered composites are obtained by slow water evaporation. The composite blends present better self‐organization of rGO, tendency of segregated network formation, and electrically conductive properties. The in situ composites present decreased aggregation of rGO, uniformly distributed rGO in the polymeric matrix and lower conductivity.

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Articles you may be interested inDistortion of ethyne on coordination to silver acetylide, C2H2AgCCH, characterised by broadband rotational spectroscopy and ab initio calculations Distortion of ethyne on formation of a π complex with silver chloride: C2H2Ag-Cl characterised by rotational spectroscopy and ab initio calculations Millimeter-wave spectroscopy and coupled cluster calculations for a new phosphorus-carbon chain: HC 5 P Silene, H 2 CSiH 2 , has been efficiently produced by pyrolysis of 5,6-bis͑trifluoromethyl͒-2-silabicyclo͓2.2.2͔octa-5,7-diene ͑SBO͒. Seven isotopomers have been observed by millimeterand submillimeter-wave spectroscopy. From the different sets of experimental molecular parameters and from ab initio calculations of the rovibrational interaction parameters, the equilibrium structure has been obtained by a least squares analysis of the rotational constants. The results are: r e (SivC) ϭ 1.7039(18) Å, r e (C-H) ϭ 1.0819(12) Å, r e (Si-H) ϭ 1.4671(9) Å, ЄHCSi ϭ 122.00(4)°, and ЄHSiC ϭ 122.39(3)°. This experimental structure is in excellent agreement with the equilibrium geometry calculated at the CCSD͑T͒ level of theory with a cc-pV͑Q,T͒Z basis set. This is the first experimental determination without any constraint of the SivC double bond length in the parent compound of the silaalkene family. A lifetime of 30 ms has been observed for this molecule in the gas phase at low pressure.

Abstract Poly(lactic acid) (PLA) based composite films with different content of talc (5–15 wt%) were prepared by the solvent casting method. The effect of talc on morphological, structural, thermal, barrier and mechanical properties of neat PLA was investigated. The PLA/talc composites revealed a polymorphic crystalline structure, as demonstrated by X-ray diffraction (XRD) study and differential scanning calorimetry (DSC) analysis. The PLA/talc composites also exhibited significantly improved barrier properties (up to 55% compared to neat PLA), as shown by water vapor permeability (WVP) tests. The puncture measurements showed improved mechanical properties at lower content of talc (up to 5 wt%), and increased brittleness of the PLA/talc composite films at higher talc concentrations.