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Molecules
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Thermal and Rheological Characterization of Polymeric Materials
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Thermal and Rheological Characterization of Polymeric Materials

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (31 May 2022) | Viewed by 7770

Special Issue Editors

Dr. Ramon Artiaga

E-Mail Website
Guest Editor
Department of Naval and Industrial Engineering, University of A Coruña, EPS, Avda. Medizábal S/n, 15403 Ferrol, Spain
Interests: thermal characterization; rheology; DSC; TGA; polymers; MOFs
Dr. Jorge López-Beceiro

E-Mail Website
Guest Editor
Department of Naval and Industrial Engineering, University of A Coruña, EPS, Avda. Medizábal S/n, 15403 Ferrol, Spain
Interests: Materials Science; Thermal Analysis; Rhelogy; Composites

Special Issue Information

Dear Colleagues,

This Special Issue is aimed at bringing together two disciplines closely related but usually addressed in different forums. Thermal and rheological characterization of polymers complement each other so that their thermal properties cannot be fully understood unless rheological behavior is well known too. These properties are of high importance both for processing and end use.

Researchers working in the fields of both thermal and rheological characterization of polymeric materials are invited to contribute original research papers or reviews to this Special Issue of Molecules. This includes, but is not limited to, procedural works and improvements on current testing methods, and works focused on getting a new insight on standard methods.

Dr. Ramon Artiaga
Dr. Jorge López-Beceiro
Guest Editors

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. Molecules 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

  • Thermal analysis
  • Rheology
  • Thermoplastic
  • Thermosets
  • Rubber
  • Polymer matrix composites

Published Papers (3 papers)

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Research

12 pages, 2623 KiB  
Article
Evaluation of Thermal Properties of Composites Prepared from Pistachio Shell Particles Treated Chemically and Polypropylene
by Beatriz Adriana Salazar-Cruz, María Yolanda Chávez-Cinco, Ana Beatriz Morales-Cepeda, Claudia Esmeralda Ramos-Galván and José Luis Rivera-Armenta
Molecules 2022, 27(2), 426; https://doi.org/10.3390/molecules27020426 - 10 Jan 2022
Cited by 16 | Viewed by 2031
Abstract
The purpose of the present work was to prepare polypropylene (PP) matrix composited filled with chemically treated pistachio shell particles (PTx), and evaluate their effect on the composites’ thermal properties. PP-PTx composites were formulated in different PTx content (from 2 to 10 phr) [...] Read more.
The purpose of the present work was to prepare polypropylene (PP) matrix composited filled with chemically treated pistachio shell particles (PTx), and evaluate their effect on the composites’ thermal properties. PP-PTx composites were formulated in different PTx content (from 2 to 10 phr) in a mixing chamber, using the melt-mixing process. The PTx were chemically treated using a NaOH solution and infrared spectroscopy (FTIR). According to thermogravimetric analysis (TGA), the treatment of pistachio shell particles resulted in the remotion of lignin and hemicellulose. The thermal stability was evaluated by means of TGA, where the presence of PTx in composites showed a positive effect compared with PP pristine. Thermal properties such as crystallization temperature (Tc), crystallization enthalpy (∆Hc), melting temperature (Tm) and crystallinity were determinate by means differential scanning calorimetry (DSC); these results suggest that the PTx had a nucleation effect on the PP matrix, increasing their crystallinity. Dynamic mechanical analysis (DMA) showed that stiffness of the composites increase compared with that PP pristine, as well as the storage modulus, and the best results were found at a PTx concentration of 4 phr. At higher concentrations, the positive effect decreased; however, they were better than the reference PP. Full article
(This article belongs to the Special Issue Thermal and Rheological Characterization of Polymeric Materials)
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14 pages, 1604 KiB  
Article
Properties of Mosquito Repellent-Plasticized Poly(lactic acid) Strands
by António B. Mapossa, Jorge López-Beceiro, Ana María Díaz-Díaz, Ramón Artiaga, Dennis S. Moyo, Thabang N. Mphateng and Walter W. Focke
Molecules 2021, 26(19), 5890; https://doi.org/10.3390/molecules26195890 - 28 Sep 2021
Cited by 6 | Viewed by 2634
Abstract
Poly(lactic acid) (PLA) is an attractive candidate for replacing petrochemical polymers because it is fully biodegradable. This study investigated the potential of PLA as a sustainable and environmentally friendly alternative material that can be developed into commercially viable wearable mosquito repellent devices with [...] Read more.
Poly(lactic acid) (PLA) is an attractive candidate for replacing petrochemical polymers because it is fully biodegradable. This study investigated the potential of PLA as a sustainable and environmentally friendly alternative material that can be developed into commercially viable wearable mosquito repellent devices with desirable characteristics. PLA strands containing DEET and IR3535 were prepared by twin screw extrusion compounding and simultaneously functioned as plasticizers for the polymer. The plasticizing effect was investigated by thermal and rheological studies. DSC studies showed that the addition of DEET and IR3535 into PLA strands reduced the glass transition temperature consistent with predictions of the Fox equation, thus proving their efficiency as plasticizers. The rheology of molten samples of neat PLA and PLA/repellents blends, evaluated at 200 °C, was consistent with shear-thinning pseudoplastic behaviour. Raman studies revealed a nonlinear concentration gradient for DEET in the PLA strand, indicating non-Fickian Type II transport controlling the desorption process. Release data obtained at 50 °C showed initial rapid release followed by a slower, near constant rate at longer times. The release rate data were fitted to a novel modification of the Peppas-Sahlin desorption model. Full article
(This article belongs to the Special Issue Thermal and Rheological Characterization of Polymeric Materials)
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25 pages, 893 KiB  
Article
A Critical Evaluation and Modification of the Padé–Laplace Method for Deconvolution of Viscoelastic Spectra
by Siamak Shams Es-haghi and Douglas J. Gardner
Molecules 2021, 26(16), 4838; https://doi.org/10.3390/molecules26164838 - 10 Aug 2021
Cited by 2 | Viewed by 2477
Abstract
This paper shows that using the Padé–Laplace (PL) method for deconvolution of multi-exponential functions (stress relaxation of polymers) can produce ill-conditioned systems of equations. Analysis of different sets of generated data points from known multi-exponential functions indicates that by increasing the level of [...] Read more.
This paper shows that using the Padé–Laplace (PL) method for deconvolution of multi-exponential functions (stress relaxation of polymers) can produce ill-conditioned systems of equations. Analysis of different sets of generated data points from known multi-exponential functions indicates that by increasing the level of Padé approximants, the condition number of a matrix whose entries are coefficients of a Taylor series in the Laplace space grows rapidly. When higher levels of Padé approximants need to be computed to achieve stable modes for separation of exponentials, the problem of generating matrices with large condition numbers becomes more pronounced. The analysis in this paper discusses the origin of ill-posedness of the PL method and it was shown that ill-posedness may be regularized by reconstructing the system of equations and using singular value decomposition (SVD) for computation of the Padé table. Moreover, it is shown that after regularization, the PL method can deconvolute the exponential decays even when the input parameter of the method is out of its optimal range. Full article
(This article belongs to the Special Issue Thermal and Rheological Characterization of Polymeric Materials)
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