Macromolecular Compounds and Nanocomposites: Synthesis, Characterizations and Applications

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Applications".

Deadline for manuscript submissions: closed (25 October 2023) | Viewed by 3248

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Faculty of Chemical Engineering and Biotechnologies, University of Bucharest, 1–7 Gh. Polizu Street, 011061 Bucharest, Romania
Interests: polymers; nanoparticles
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Guest Editor
Department of Bioresources and Polymer Science, Faculty of Applied Chemistry and Materials Science, University ‘Politehnica’ of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
Interests: materials chemistry; polymer synthesis/recycling/reconversion; green chemistry

Special Issue Information

Dear Colleagues,

Nanocomposites represent a new class of composites, characterized by the coexistence of two distinct phases, one continuous (organic polymer) and an inorganic or carbon-based dispersed phase with a nanometric size range (1-100 nm) (1 nm= 10-9m). A nanometer is about 4 times the diameter of an atom. In the case of nanocomposites, the size of the reinforcing agent is in the nanometric range, which makes the interfacial area relative to the volume to be extremely large. Since the distance between the polymer and the filler (powder or granular filler material) is extremely small, and the macromolecular cluster has a diameter in the range of the particle size range resulting in a strong interaction between the polymer and the filler, that will be reflected on the special properties of the polymer nanocomposites. In contrast with composites which present a concentration of reinforcing agent up to 40%, in the case of nanocomposites the concentration usually does not exceed 5%. The advantages of these structures consist in global properties superior to the individual components (optical clarity, mechanical resistance, rigidity, impermeability, temperature resistance, etc.) presenting important uses in electronics, optics, constructions, etc.

Dr. Edina Rusen
Dr. Aurel Diacon
Guest Editors

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Keywords

  • macromolecular compounds
  • macromolecular nanocomposites
  • macromolecular synthesis: macromolecular characterizations
  • macromolecular applications

Published Papers (1 paper)

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Research

16 pages, 7704 KiB  
Article
Epoxy Coatings Containing Modified Graphene for Electromagnetic Shielding
by Marius Gabriel Bontaș, Aurel Diacon, Ioan Călinescu, Mădălina Ioana Necolau, Adrian Dinescu, Gabriela Toader, Raluca Ginghină, Alexandru-Mădălin Vizitiu, Valentin Velicu, Petru Palade, Marcel Istrate and Edina Rusen
Polymers 2022, 14(12), 2508; https://doi.org/10.3390/polym14122508 - 20 Jun 2022
Cited by 5 | Viewed by 2662
Abstract
This study presents the functionalization and characterization of graphene and electromagnetic interference (EMI) attenuation capacity in epoxy-nanocomposites. The modification of graphene involved both small molecules and polymers for compatibilization with epoxy resin components to provide EMI shielding. The TGA and RAMAN analyses confirmed [...] Read more.
This study presents the functionalization and characterization of graphene and electromagnetic interference (EMI) attenuation capacity in epoxy-nanocomposites. The modification of graphene involved both small molecules and polymers for compatibilization with epoxy resin components to provide EMI shielding. The TGA and RAMAN analyses confirmed the synthesis of graphene with a different layer thickness of the graphene sheets. Graphene samples with different layer thicknesses (monolayer, few layers, and multilayer) were selected and further employed for epoxy coating formulation. The obtained nanocomposites were characterized in terms of EMI shielding effectiveness, SEM, micro-CT, magnetic properties, and stress-strain resistance. The EMI shielding effectiveness results indicated that the unmodified graphene and hexamethylene diamine (HMDA) modified graphene displayed the best EMI shielding properties at 11 GHz. However, the epoxy nanocomposites based on HMDA modified graphene displayed better flexibility with an identical EMI shielding effectiveness compared to the unmodified graphene despite the formation of aggregates. The improved flexibility of the epoxy nanocomposites and EMI shielding characteristics of HMDA functionalized graphene offers a practical solution for textile coatings with microwave absorbing (MA) capacity. Full article
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