Thermomechanical Properties of Micro and Nano Reinforced Polymer Composites

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

Deadline for manuscript submissions: closed (1 August 2023) | Viewed by 1889

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Advanced Polymer Materials Group, University Politehnica of Bucharest, 011061 Bucharest, Romania
Interests: epoxy polymers; carbon nanotube functionalization; graphene oxide functionalization; sustainable nanocomposites; coatings; X-ray photoelectron spectroscopy
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Special Issue Information

Dear Colleagues,

The aim of this issue is to bring together important findings by researchers in the field of micro- and nanocomposite materials regarding the relationship between the structure of polymer composites and thermomechanical characteristics. However, other attributes are also envisaged, such as the interface and interphase at polymer-matrix-reinforcing surfaces, adhesion to different substrates, or wetting characteristics. These research papers will contribute to interdisciplinary knowledge in chemistry, mechanics, materials science, and engineering. The goal is to improve the applications of polymeric micro- and nanocomposites such as coatings, structural materials, aeronautic components, and materials for electronics or automotive through the dissemination of valuable expertise from different domains of research.

Dr. Celina Maria Damian
Guest Editor

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Keywords

  • polymer nanocomposites
  • polymer microcomposites
  • thermomechanical properties
  • structure–property relationship
  • reinforcing agent

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Published Papers (1 paper)

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Research

18 pages, 3631 KiB  
Article
Investigating the Synthesis and Characteristics of UV-Cured Bio-Based Epoxy Vegetable Oil-Lignin Composites Mediated by Structure-Directing Agents
by Brindusa Balanuca, Raluca Sanda Komartin, Madalina Ioana Necolau, Celina Maria Damian and Raluca Stan
Polymers 2023, 15(2), 439; https://doi.org/10.3390/polym15020439 - 13 Jan 2023
Cited by 3 | Viewed by 1439
Abstract
Bio-based composites were developed from the epoxy derivatives of Lallemantia iberica oil and kraft lignin (ELALO and EpLnK), using UV radiation as a low energy consumption tool for the oxiranes reaction. To avoid the filler sedimentation or its inhomogeneous distribution in the oil [...] Read more.
Bio-based composites were developed from the epoxy derivatives of Lallemantia iberica oil and kraft lignin (ELALO and EpLnK), using UV radiation as a low energy consumption tool for the oxiranes reaction. To avoid the filler sedimentation or its inhomogeneous distribution in the oil matrix, different structure-directing agents (SDA) were employed: 1,3:2,4-dibenzylidene-D-sorbitol (DBS), 12-hydroxystearic acid (HSA) and sorbitan monostearate (Span 60). The SDA and EpLnK effect upon the ELALO-based formulations, their curing reaction and the performance of the resulting materials were investigated. Fourier-transform Infrared Spectrometry (FTIR) indicates different modes of molecular arrangement through H bonds for the initial ELALO-SDA or ELALO-SDA-EpLnK systems, also confirming the epoxy group’s reaction through the cationic mechanism for the final composites. Gel fraction measurements validate the significant conversion of the epoxides for those materials containing SDAs or 1% EpLnK; an increased EpLnK amount (5%), with or without SDA addition, conduced to an inefficient polymerization process, with the UV radiation being partially absorbed by the filler. Thermo-gravimetric and dynamic-mechanical analyses (TGA and DMA) revealed good properties for the ELALO-based materials. By loading 1% EpLnK, the thermal stability was improved to with 10 °C (for Td3%) and the addition of each SDA differently influenced the Tg values but also gave differences in the glassy and rubbery states when the storage moduli were interrogated, depending on their chemical structures. Water affinity and morphological studies were also carried out. Full article
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