Extrinsic electrically conducting polymer composites are versatile materials for applications in sensors, electrical components, antistatic coatings, among others. The use of carbon‐based conducting loads, such as graphene, in polymer nanocomposites allows the manufacturing of suitable electrically conducting films for a variety of applications. In our work, graphene sheets are covalently modified with histidine, phenylalanine, or beta‐alanine aminoacids, in order to improve dispersion and impart extrinsic conductivity to poly(vinyl alcohol) (PVA) films. The presence of organic groups in the surface of graphene sheets improved their dispersion in polymer matrices. In addition, such benign surface modifiers are suitable to produce environmentally friendly, electrically conducting loads for polymer nanocomposites. Our findings showed that aminoacid‐functionalized graphenes have good dispersability, resulting in semiconducting nanocomposite films with preserved thermal stability, suggesting that these carbon‐based nanoloads are suitable additives for PVA in applications including antistatic paints and coatings.

Form‐stable solid‐liquid phase change materials (FSSL‐PCM) are capable of latent heat storage by absorbing thermal energy at constant temperature while undergoing solid‐liquid state transitions. We suggest new nanocomposites based on biodegradable polyesters Poly(ϵ‐caprolactone) (PCL), Poly(3‐hidroxybutyrate) (P‐3‐HB) or their blends with Poly(ethylene oxide) (PEO) embedded in the nanopores of thermally expanded natural graphite (EG) as FSSL‐PCM. These nanocomposites are submitted heating‐cooling cycles, in the fusion‐crystallization temperature range, without appreciable changes in thermal stability or latent heat storage capabilities, as assessed by Fourier Transform Infrared (FTIR) Spectroscopy Analysis, Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). Such materials are suitable as PCMs used as storage media in solar energy‐based low‐medium temperature latent storage systems, for example, water‐heating systems, air‐heating units, solar greenhouses, among others.