Special Issue "Polymer Rheology and Processing of Nano- and Micro-Composites"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 31 October 2020.

Special Issue Editor

Prof. Ramón Pamies
Website
Guest Editor
Universidad Politécnica de Cartagena, Grupo de Ciencia de Materiales e Ingeniería Metalúrgica, Cartagena, Spain
Interests: nanomaterials; carbon nanophase; rheology; tribology

Special Issue Information

Dear Colleagues,

The design and obtention of micro- and nano-composites is an increasing technology that improves the optical, mechanical, and electrical properties of polymeric materials with promising applications in different fields, such as nanotechnology, agriculture, or biomedicine. The agglomeration of particles leads to the diminution of the properties and worse processing conditions of the composite. Therefore, one of the current challenges of this technology is obtaining a homogeneous dispersion of micro and nanoparticles in the plastic. Rheology is a powerful tool that provides crucial knowledge regarding the interaction between the different phases added to polymeric matrices and the processing of composites. For example, the viscoelastic properties determine the conditions of processing and the mechanical behavior of thin films. Thus, the rheological characterization and computational modelling of composites provide critical information about the compatibility of the different phases and the processing of the final material. Moreover, these new materials demand the development of innovative processing methods and technologies that can result in novel applications.

In this Special Issue, original research papers and reviews reporting experimental and computational investigations of the viscoelastic properties and progress, and modernization in processing technologies of micro- and nano-composites are expected.

Prof. Ramón Pamies
Guest Editor

Manuscript Submission Information

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Keywords

  • Rheology of composites
  • Plastic technology
  • Nanomaterials
  • Microparticles
  • Processing of polymer-based materials
  • Composites

Published Papers (4 papers)

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Research

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Open AccessArticle
Searching for Rheological Conditions for FFF 3D Printing with PVC Based Flexible Compounds
Materials 2020, 13(1), 178; https://doi.org/10.3390/ma13010178 - 01 Jan 2020
Abstract
Rheology is proposed as a tool to explore plasticized poly(vinyl chloride) (PVC) formulations to be used in the fused filament fabrication (FFF) 3D printing process and so manufactures flexible and ductile objects by this technique. The viscoelastic origin of success/failure in FFF of [...] Read more.
Rheology is proposed as a tool to explore plasticized poly(vinyl chloride) (PVC) formulations to be used in the fused filament fabrication (FFF) 3D printing process and so manufactures flexible and ductile objects by this technique. The viscoelastic origin of success/failure in FFF of these materials is investigated. The analysis of buckling of the filament is based on the ratio between compression modulus and viscosity, but for a correct approach the viscosity should be obtained under the conditions established in the nozzle. As demonstrated by small amplitude oscillatory shear (SAOS) measurements, PVC formulations have a crystallites network that provokes clogging in the nozzle. This network restricts printing conditions, because only vanishes at high temperatures, at which thermal degradation is triggered. It is observed that the analysis of the relaxation modulus G(t) is more performing than the G″/G′ ratio to get conclusions on the quality of layers welding. Models printed according to the established conditions show an excellent appearance and flexibility, marking a milestone in the route to obtain flexible objects by FFF. Full article
(This article belongs to the Special Issue Polymer Rheology and Processing of Nano- and Micro-Composites)
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Open AccessArticle
Synthesis and Characterization of New Layered Double Hydroxide-Polyolefin Film Nanocomposites with Special Optical Properties
Materials 2019, 12(21), 3580; https://doi.org/10.3390/ma12213580 - 31 Oct 2019
Cited by 1
Abstract
In this study, we have synthesized new double layered hydroxides to be incorporated to low density polyethylene thermoplastic matrix. These new composites present promising applications as materials to build greenhouses due to the enhancement of their optical properties. A characterization of the modified [...] Read more.
In this study, we have synthesized new double layered hydroxides to be incorporated to low density polyethylene thermoplastic matrix. These new composites present promising applications as materials to build greenhouses due to the enhancement of their optical properties. A characterization of the modified nanoclay has been performed by means of X-ray fluorescence (XRF), X-ray Diffraction (XRD), Thermogravimetric analysis (TGA), and Fourier-transform infrared spectroscopy (FTIR). We have prepared a series of polyolefin-based films to evaluate the effect of the addition of a whitening agent (disodium 2,2′-((1,1′-biphenyl)-4,4′-diyldivinylene)bis(benzenesulfonate)), the modified hydrotalcite-like material and a commercial dispersant. The rheological and mechanical characterization of the films have proved that the inclusion of the modified-layered double hydroxides (LDHs) do not substantially affect the processing and mechanical performance of the material. On the other hand, optical properties of the nanocomposites are improved by reducing the transmission in the UVA region. Full article
(This article belongs to the Special Issue Polymer Rheology and Processing of Nano- and Micro-Composites)
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Open AccessArticle
Characterization of Sodium and Potassium Nitrate Contaminated Polyaniline-Poly (Ethylene Oxide) Composites Synthesized via Facile Solution Casting Technique
Materials 2019, 12(13), 2168; https://doi.org/10.3390/ma12132168 - 05 Jul 2019
Cited by 2
Abstract
Fabrication of composites by developing simple techniques can be an effective way to modify some properties of individual materials. The present study relates to facile synthesis of sodium nitrate (NaNO3) and potassium nitrate (KNO3) contaminated polyaniline (PANI) and poly [...] Read more.
Fabrication of composites by developing simple techniques can be an effective way to modify some properties of individual materials. The present study relates to facile synthesis of sodium nitrate (NaNO3) and potassium nitrate (KNO3) contaminated polyaniline (PANI) and poly (ethylene oxide) (PEO) composites without using any additives, plasticizers, or fibers. The physic-chemical and rheological properties of synthesized composites were analyzed. The composites showed enhancement in both storage and loss modules in comparison with the polymer matrices. The dynamic viscosity of the synthesized materials has inverse relation with that of temperature and shear stress. Rheological analysis reveals a continuous drop off in viscosity by increasing shear stress. The flow behavior was affected little by temperature. However, the overall results showed a shear thinning effect suggesting that polymer composites show non-Newtonian behavior. The addition of NaNO3 and KNO3 had a profound effect on shear viscosity of the materials, although the overall shear thinning behavior prevails. The PANI-PEO composite follows, as the first approximation models, both Bingham and modified Bingham models, while the salt contaminated system follows only the Bingham model. Both show shear stress values. The greater values of storage (G′) and loss (G″) modulus of composites than PANI-PEO blend suggests excellent elasticity, better stiffness, and good mechanical strength of the composites. Furthermore, the composites were more thermally stable than pure polymers. Full article
(This article belongs to the Special Issue Polymer Rheology and Processing of Nano- and Micro-Composites)
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Review

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Open AccessReview
Extrusion of Polymer Nanocomposites with Graphene and Graphene Derivative Nanofillers: An Overview of Recent Developments
Materials 2020, 13(3), 549; https://doi.org/10.3390/ma13030549 - 23 Jan 2020
Abstract
This review is focused on the recent developments of nanocomposite materials that combine a thermoplastic matrix with different forms of graphene or graphene oxide nanofillers. In all cases, the manufacturing method of the composite materials has been melt-processing, in particular, twin-screw extrusion, which [...] Read more.
This review is focused on the recent developments of nanocomposite materials that combine a thermoplastic matrix with different forms of graphene or graphene oxide nanofillers. In all cases, the manufacturing method of the composite materials has been melt-processing, in particular, twin-screw extrusion, which can then be followed by injection molding. The advantages of this processing route with respect to other alternative methods will be highlighted. The results point to an increasing interest in biodegradable matrices such as polylactic acid (PLA) and graphene oxide or reduced graphene oxide, rather than graphene. The reasons for this will also be discussed. Full article
(This article belongs to the Special Issue Polymer Rheology and Processing of Nano- and Micro-Composites)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

1. Extrusion of Polymers and Nanocomposites: A review

G. Ojados; C. Sánchez-Rodríguez; R. Pamies ([email protected]);J. Sanes ([email protected]); M.D. Bermúdez ([email protected])

Departamento de Ingeniería Mecánica, Materiales y Fabricación


 

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