Hybrid Materials Based on Thermosets

A special issue of Polymers (ISSN 2073-4360).

Deadline for manuscript submissions: closed (15 July 2018)

Special Issue Editor


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Guest Editor
Head of Advanced Polymer Materials Group, Vice-Rector/Director of Council for Doctoral Studies University POLITEHNICA of Bucharest, Str. Splaiul Independentei 313, Sector 6, Bucharest, Romania
Interests: synthesis of nanomaterials with new polybenzoxazines matrices; hybrid dental nanomaterials with enhanced properties; modelling and predicting of hybrid nanocomposites properties using computational models; synthesis of various polymer nanocomposites for biomedical engineering
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Special Issue Information

Dear Colleagues,

This Special Issue focuses on the synthesis, process and characterization of all types of hybrids, which include a thermoset as a main component. Papers concerning advanced approaches for top quality products manufacturing based on thermosets are also welcomed. The results presented may include data about synthesis of hybrid materials based on thermosets reinforced with various fibers/fillers producing advanced composites with enhanced properties for various applications. These may include but are not limited to electronics, aerospace, medicine, construction, transports. The papers may also refer to advanced topics like nanocomposites reinforced with carbon-like structures (graphene, carbon fibers, carbon nanotubes, etc.) or organic–inorganic compounds (POSS, etc.).

Prof. Horia Iovu
Guest Editor

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Keywords

  • Hybrid materials
  • Thermosets
  • Epoxy resins
  • Vinylic resins
  • Organic-inorganic compounds

Published Papers (4 papers)

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Research

11 pages, 3720 KiB  
Article
Advanced Polybenzoxazine Structures Based on Modified Reduced Graphene Oxide
by Elena Iuliana Bîru, Sorina Alexandra Gârea, Alina Nicolescu, Eugeniu Vasile and Horia Iovu
Polymers 2018, 10(9), 941; https://doi.org/10.3390/polym10090941 - 24 Aug 2018
Cited by 11 | Viewed by 4089
Abstract
Two new polybenzoxazine products based on a reduced graphene oxide (rGO) were synthesized. The synthesis process started with an rGO with amino functionalities. Benzoxazine structures were synthesized with oxazine rings attached to the surface of rGO and were fully characterized by FT-IR, 1 [...] Read more.
Two new polybenzoxazine products based on a reduced graphene oxide (rGO) were synthesized. The synthesis process started with an rGO with amino functionalities. Benzoxazine structures were synthesized with oxazine rings attached to the surface of rGO and were fully characterized by FT-IR, 1H–NMR, XPS and XRD. The presence of polybenzoxazine chains was pointed out by 1H–NMR and it correlated with XRD data which show a partial exfoliation of the graphene oxide layers. The degree of polymerization plays a significant role against the exfoliation process. A higher yield of the ring-opening process for benzoxazine rings leads to a low degree of exfoliation, as the inner covalent bonds within the polybenzoxazine chains keep the graphene oxide sheets together. Full article
(This article belongs to the Special Issue Hybrid Materials Based on Thermosets)
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14 pages, 3102 KiB  
Article
Layer-Structured Design and Fabrication of Cyanate Ester Nanocomposites for Excellent Electromagnetic Shielding with Absorption-Dominated Characteristic
by Fang Ren, Zheng-Zheng Guo, Han Guo, Li-Chuan Jia, Yu-Chen Zhao, Peng-Gang Ren and Ding-Xiang Yan
Polymers 2018, 10(9), 933; https://doi.org/10.3390/polym10090933 - 21 Aug 2018
Cited by 19 | Viewed by 3985
Abstract
In this work, we propose novel layer-structured polymer composites (PCs) for manipulating the electromagnetic (EM) wave transport, which holds unique electromagnetic interference (EMI) shielding features. The as-prepared PCs with a multilayered structure exhibits significant improvement in overall EMI shielding effectiveness (EMI SE) by [...] Read more.
In this work, we propose novel layer-structured polymer composites (PCs) for manipulating the electromagnetic (EM) wave transport, which holds unique electromagnetic interference (EMI) shielding features. The as-prepared PCs with a multilayered structure exhibits significant improvement in overall EMI shielding effectiveness (EMI SE) by adjusting the contents and distribution of electrical and magnetic loss fillers. The layer-structured PCs with low nanofiller content (5 wt % graphene nanosheets (GNSs) and 15 wt % Fe3O4) and a thickness of only 2 mm exhibited ultrahigh electrical conductivity and excellent EMI SE, reaching up to 2000 S/m and 45.7 dB in the X-band, respectively. The increased EMI SE of the layer-structured PCs was mainly based on the improved absorption rather than the reflection of electromagnetic waves, which was attributed to the “absorb-reflect-reabsorb” process for the incident electromagnetic waves. This work may provide a simple and effective approach to achieve new EMI shielding materials, especially for absorption-dominated EMI shielding. Full article
(This article belongs to the Special Issue Hybrid Materials Based on Thermosets)
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13 pages, 3911 KiB  
Article
Synthesis of Benzene Tetracarboxamide Polyamine and Its Effect on Epoxy Resin Properties
by Seoyoon Yu, Wonjoo Lee, Bongkuk Seo and Chung-Sun Lim
Polymers 2018, 10(7), 782; https://doi.org/10.3390/polym10070782 - 16 Jul 2018
Cited by 3 | Viewed by 5266
Abstract
Epoxy resins have found various industrial applications in high-performance thermosetting resins, high-performance composites, electronic-packaging materials, adhesives, protective coatings, etc., due to their outstanding performance, including high toughness, high-temperature performance, chemical and environmental resistance, versatile processability and adhesive properties. However, cured epoxy resins are [...] Read more.
Epoxy resins have found various industrial applications in high-performance thermosetting resins, high-performance composites, electronic-packaging materials, adhesives, protective coatings, etc., due to their outstanding performance, including high toughness, high-temperature performance, chemical and environmental resistance, versatile processability and adhesive properties. However, cured epoxy resins are very brittle, which limits their applications. In this work, we attempted to enhance the toughness of cured epoxy resins by introducing benzene tetracarboxamide polyamine (BTCP), synthesized from pyromellitic dianhydride (PMDA) and diamines in N-methyl-2-pyrrolidone (NMP) solvent. During this reaction, increased viscosity and formation of amic acid could be confirmed. The chemical reactions were monitored and evidenced using 1H-NMR spectroscopy, FT-IR spectroscopy, water gel-phase chromatography (GPC) analysis, amine value determination and acid value determination. We also studied the effect of additives on thermomechanical properties using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamical mechanical analysis (DMA), thermomechanical analysis (TMA) and by measuring mechanical properties. The BTCP-containing epoxy resin exhibited high mechanical strength and adhesion strength proportional to the amount of BTCP. Furthermore, field-emission scanning electron microscopy images were obtained for examining the cross-sectional morphology changes of the epoxy resin specimens with varying amounts of BTCP. Full article
(This article belongs to the Special Issue Hybrid Materials Based on Thermosets)
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16 pages, 6065 KiB  
Article
Thermoconductive Thermosetting Composites Based on Boron Nitride Fillers and Thiol-Epoxy Matrices
by Isaac Isarn, Xavier Ramis, Francesc Ferrando and Angels Serra
Polymers 2018, 10(3), 277; https://doi.org/10.3390/polym10030277 - 07 Mar 2018
Cited by 28 | Viewed by 4530
Abstract
In this work, the effect of the addition of boron nitride (BN) fillers in a thiol-cycloaliphatic epoxy formulation has been investigated. Calorimetric studies put into evidence that the kinetics of the curing has been scarcely affected and that the addition of particles does [...] Read more.
In this work, the effect of the addition of boron nitride (BN) fillers in a thiol-cycloaliphatic epoxy formulation has been investigated. Calorimetric studies put into evidence that the kinetics of the curing has been scarcely affected and that the addition of particles does not affect the final structure of the network. Rheologic studies have shown the increase in the viscoelastic properties on adding the filler and allow the percolation threshold to be calculated, which was found to be 35.5%. The use of BN agglomerates of bigger size increases notably the viscosity of the formulation. Glass transition temperatures are not affected by the filler added, but Young’s modulus and hardness have been notably enhanced. Thermal conductivity of the composites prepared shows a linear increase with the proportion of BN particle sheets added, reaching a maximum of 0.97 W/K·m. The addition of 80 μm agglomerates, allowed to increase this value until 1.75 W/K·m. Full article
(This article belongs to the Special Issue Hybrid Materials Based on Thermosets)
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