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Advances in Rheology of Polymers
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Advances in Rheology of Polymers

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

Deadline for manuscript submissions: closed (15 August 2023) | Viewed by 8582

Special Issue Editor

Dr. Shaocong Dai

E-Mail Website
Guest Editor
School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, NSW, Australia
Interests: suspension rheology; elongational flows of non-colloidal suspensions; flow properties; anisotropic thermal conductivity in sheared polypropylene; polymer rheology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Polymers are one of the most important materials for modern-day technological applications and daily life. Polymers’ complex rheological properties should be considered when using or producing polymeric materials, such as their melt viscosity, flow properties, viscoelasticity, temperature dependence, glass transition temperature, aging behavior, etc. Various testing and analytical methods can optimize the rheological properties of polymers until they meet all application requirements.

Previously, we experimentally and theoretically investigated the effect of particle roughness on suspension rheology, the elongational flows of non-colloidal suspensions, viscometric functions for non-colloidal sphere suspensions, bread dough rheology and the effect of pre-test deformation, and anisotropic thermal conductivity in sheared polypropylene, etc., and published these achievements.

Based on these results, this Special Issue aims to provide an academic exchange platform for research on polymer rheology. With a focus on the rheology of polymers, potential topics include, but are not limited to, the following:

  • Melt viscosity;
  • Suspension rheology;
  • Elongational flows of non-colloidal suspensions;
  • Viscometric functions;
  • Flow properties;
  • Viscoelasticity;
  • Temperature dependence;
  • Anisotropic thermal conductivity in sheared polypropylene;
  • Glass transition temperature;
  • Polymer rheology.

Dr. Shaocong Dai
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • melt viscosity
  • suspension rheology
  • elongational flows of non-colloidal suspensions
  • viscometric functions
  • flow properties
  • viscoelasticity
  • temperature dependence
  • anisotropic thermal conductivity in sheared polypropylene
  • glass transition temperature
  • polymer rheology

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (3 papers)

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Research

15 pages, 6251 KiB  
Article
Rheological Characteristics of Starch-Based Biodegradable Blends
by Dong-Il Park, Yuzhen Dong, Shizhao Wang, Soo-Jeong Lee and Hyoung Jin Choi
Polymers 2023, 15(8), 1953; https://doi.org/10.3390/polym15081953 - 20 Apr 2023
Cited by 6 | Viewed by 2682
Abstract
Thermoplastic starch was blended with commercially available biodegradable polyesters of poly(butylene adipate-co-terephthalate) (PBAT) and poly(lactic acid) (PLA) for its improved performance and processability. The morphology and elemental composition of these biodegradable polymer blends were observed by scanning electron microscopy and energy dispersive X-ray [...] Read more.
Thermoplastic starch was blended with commercially available biodegradable polyesters of poly(butylene adipate-co-terephthalate) (PBAT) and poly(lactic acid) (PLA) for its improved performance and processability. The morphology and elemental composition of these biodegradable polymer blends were observed by scanning electron microscopy and energy dispersive X-ray spectroscopy, respectively, while their thermal properties were analyzed using thermogravimetric analysis and differential thermal calorimetry. For rheological analysis, the steady shear and dynamic oscillation tests of three samples at various temperatures were investigated using a rotational rheometer. All three samples exhibited significant shear thinning at all measured temperatures, and their shear viscosity behavior was plotted using the Carreau model. The frequency sweep tests showed that the thermoplastic starch sample exhibited a solid state at all temperatures tested, whereas both starch/PBAT and starch/PBAT/PLA blend samples exhibited viscoelastic liquid behavior after the melting temperature such that their loss modulus at low frequencies was greater than the storage modulus, and inversion occurred at high frequencies (storage modulus > loss modulus). Full article
(This article belongs to the Special Issue Advances in Rheology of Polymers)
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10 pages, 5443 KiB  
Article
Time–Concentration Superposition for Linear Viscoelasticity of Polymer Solutions
by Can-Qi Li, Horst Henning Winter, Yuan-Qi Fan, Geng-Xin Xu and Xue-Feng Yuan
Polymers 2023, 15(7), 1807; https://doi.org/10.3390/polym15071807 - 6 Apr 2023
Viewed by 2914
Abstract
The concentration dependence of linear viscoelastic properties of polymer solutions is a well-studied topic in polymer physics. Dynamic scaling theories allow qualitative predictions of polymer solution rheology, but quantitative predictions are still limited to model polymers. Meanwhile, the scaling properties of non-model polymer [...] Read more.
The concentration dependence of linear viscoelastic properties of polymer solutions is a well-studied topic in polymer physics. Dynamic scaling theories allow qualitative predictions of polymer solution rheology, but quantitative predictions are still limited to model polymers. Meanwhile, the scaling properties of non-model polymer solutions must be determined experimentally. In present paper, the time–concentration superposition (TCS) of experimental data is shown to be a robust procedure for studying the concentration scaling properties of binary and ternary polymer solutions. TCS can not only identify whether power law scaling may exist or not, and over which concentration range, but also unambiguously estimate the concentration scaling exponents of linear viscoelastic properties for a range of non-model polymer solutions. Full article
(This article belongs to the Special Issue Advances in Rheology of Polymers)
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19 pages, 7794 KiB  
Article
Silica-Filled Polyacrylonitrile Solutions: Rheology, Morphology, Coagulation, and Fiber Spinning
by Lydia A. Varfolomeeva, Ivan Y. Skvortsov, Mikhail S. Kuzin and Valery G. Kulichikhin
Polymers 2022, 14(21), 4548; https://doi.org/10.3390/polym14214548 - 27 Oct 2022
Cited by 5 | Viewed by 2232
Abstract
The fumed silica influence on the morphology, coagulation processes, and rheological properties of suspensions in dimethyl sulfoxide (DMSO) and polyacrylonitrile (PAN)–DMSO solutions has been studied for the production of composite films and fibers. It has been shown that silica–DMSO concentrated suspensions (24 wt%) [...] Read more.
The fumed silica influence on the morphology, coagulation processes, and rheological properties of suspensions in dimethyl sulfoxide (DMSO) and polyacrylonitrile (PAN)–DMSO solutions has been studied for the production of composite films and fibers. It has been shown that silica–DMSO concentrated suspensions (24 wt%) form a weak gel with a yield point of about 200 Pa. At concentrations of ~5 wt% and above the dispersions, depending on the shear stress, are pseudoplastic or dilatant liquids. It has been found that the silica addition method into a PAN solution has a significant impact on the aggregates dispersibility and the rheological behavior of the obtained systems. A thixotropy appearance and a sharp increase in the relaxation time were observed for PAN solutions at a SiO2 content of more than 3−5 wt%, which indicates the formation of structures with a gel-like rheological behavior. Upon reaching the critical stress their destruction takes place and the system starts to behave like a viscoelastic liquid. Two spinning methods have been used for preparing fibers: standard wet and mechanotropic. By the mechanotropic method it is possible to achieve a higher draw ratio at spinning and to obtain fibers with better mechanical properties. It is possible to spin fibers from PAN solutions containing up to 15 wt% of silica per polymer with a tensile strength up to 600 MPa. Full article
(This article belongs to the Special Issue Advances in Rheology of Polymers)
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