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    Production of Graphite Nanoplatelets via Functionalized Polyketone-Assisted Diels–Alder Chemistry: Evidence of Reduced Layer Thickness and Enhanced Exfoliation Efficiency
    (MDPI AG, 2025-05-14)
    Ricardo Cisternas
    ;
    Jaime Orellana
    ;
    SILVA GONZALEZ, NATALY ROXANA  
    ;
    Jonathan Correa-Puerta
    ;
    Andrea Pucci
    This study introduces an efficient and scalable method for the top-down exfoliation of graphite into graphite nanoplatelets (GNPs) using polyketones (PKs) functionalized with Diels–Alder (DA) active groups. Leveraging the reversible covalent interactions facilitated by furan and thiophene moieties in PK, combined with melt-mixing and shear force, this process achieves significant exfoliation while preserving the structural integrity of the resulting material. Thermal and rheological analyses demonstrate enhanced interfacial adhesion and stability within polymer composites attributed to the DA-driven interactions between functionalized PK and graphite. Comparative evaluations demonstrate that furan-functionalized PK exhibits superior exfoliation efficiency, highlighting its potential for producing high-quality exfoliated graphite suitable for advanced nanocomposite applications that require enhanced thermal, mechanical, and electrical properties. This method seamlessly integrates sustainability with industrial scalability, offering significant advancements in developing GNP-based materials.
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    Scopus© Citations 17  3
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    Mechanical and Antimicrobial Polyethylene Composites with CaO Nanoparticles
    (2020)
    Cristián Silva
    ;
    Felipe Bobillier
    ;
    Daniel Canales
    ;
    Francesca Antonella Sepúlveda
    ;
    Alejandro Cament
    <jats:p>Low-density polyethylene composites containing different sizes of calcium oxide (CaO) nanoparticles were obtained by melt mixing. The CaO nanoparticles were synthesized by either the sol-gel or sonication methods, obtaining two different sizes: ca. 55 nm and 25 nm. These nanoparticles were used either as-synthesized or were modified organically on the surface with oleic acid (Mod-CaO), at concentrations of 3, 5, and 10 wt% in the polymer. The Mod-CaO nanoparticles of 25 nm can act as nucleating agents, increasing the polymer’s crystallinity. The Young’s Modulus increased with the Mod-CaO nanoparticles, rendering higher reinforcement effects with an increase as high as 36%. The reduction in Escherichia coli bacteria in the nanocomposites increased with the amount of CaO nanoparticles, the size reduction, and the surface modification. The highest antimicrobial behavior was found in the composites with a Mod-CaO of 25 nm, presenting a reduction of 99.99%. This strong antimicrobial effect can be associated with the release of the Ca2+ from the composites, as studied for the composite with 10 wt% nanoparticles. The ion release was dependent on the size of the nanoparticles and their surface modification. These findings show that CaO nanoparticles are an excellent alternative as an antimicrobial filler in polymer nanocomposites to be applied for food packaging or medical devices.</jats:p>
      17  1Scopus© Citations 36
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    Mechanical and antimicrobial properties of low‐density‐polyethylene/
    <scp>MgO</scp>
    nanocomposites
    (2022)
    Alejandro Cament
    ;
    Viviana Moreno‐Serna
    ;
    Carlos Loyo
    ;
    Pabla Quintana
    ;
    Pablo Seura
    Scopus© Citations 11  2
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    PLA/CaO nanocomposites with antimicrobial and photodegradation properties
    (2022)
    Carlos Loyo
    ;
    Viviana Moreno-Serna
    ;
    Jairo Fuentes
    ;
    Nicolás Amigo
    ;
    Francesca Antonella Sepúlveda
    Scopus© Citations 34  2