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Mechanical Properties and Thermal Analysis of Polymer Materials

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

Deadline for manuscript submissions: 31 January 2026 | Viewed by 576

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Guest Editor
National Council for Science and Technology (CONACYT–CIDESI), National Center for Aeronautic Technologies (CENTA), Carretera Estatal 200, km 23, Querétaro 76265, Mexico
Interests: nanocomposites; material characterization; nanomaterials; mechanical properties; materials testing; polymer processing
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Special Issue Information

Dear Colleagues,

The mechanical properties of a polymer involve its behavior under stress. Research related to the mechanical characteristics of polymer materials has been the subject of great interest in recent decades. Due to the complex molecular structure of polymers compared to other materials, understanding the mechanical properties concerning molecular interactions is extremely important. For studies related to polymeric materials, their mechanical properties depend on numerous factors, such as the chemical nature of the macromolecules, molecular weight (MW) and MW distribution, the degree of crystallinity, cross-linking, branching, polymer composition, and processing methods. In addition, the mechanical characteristics of polymers also depend on temperature, which is related to the viscoelastic behavior of polymers.

The physical properties of polymers include their molecular weight, molar volume, density, degree of polymerization, the crystallinity of the material, etc. Thermal analysis (TA) represents a set of techniques that measure the physical properties of polymers. Among this set of analytical experimental techniques that are commonly used in the evaluation of polymers, the following stand out: Difference Scanning Calorimetry (DSC), Differential Thermal Analysis (DTA), Thermogravimetry (TG), Thermomechanical Analysis (TMA), and Dynamic Mechanical Analysis (DMA), since they are complementary to each other. Thermal analysis is widely used in scientific and industrial fields since it allows for quantitative and qualitative measurements of various polymer materials and composites with considerable temperature ranges, obtaining relatively fast results.

This Special Issue aims to identify the relationship between thermal properties and the mechanical performance of polymers and particle-reinforced polymers (micro- and nanoscale) to offer the research community the most significant advances in this field. Our aim is to understand the fundamental relationships between crystalline processes, manufacturing processes, and the molecular interaction of the constituents in the thermal and mechanical properties of polymeric materials.

Dr. Edgar Franco-Urquiza
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 250 words) can be sent to the Editorial Office for assessment.

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

  • mechanical properties
  • thermal analysis
  • tensile
  • flexural
  • DSC
  • TGA
  • DMA
  • crystallinity

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Published Papers (1 paper)

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Research

16 pages, 3369 KB  
Article
Temperature Dependence of Tensile Properties and Deformation Behavior in Highly Strong Heat-Elongated Polypropylene
by Karin Onaka and Hiromu Saito
Polymers 2025, 17(24), 3238; https://doi.org/10.3390/polym17243238 - 5 Dec 2025
Abstract
We investigated the tensile properties and deformation behavior at various temperatures of highly strong heat-elongated polypropylene (PP), in which stacks of crystalline lamellae are macroscopically arranged in the elongated direction and lamellae are connected by thin fibrils. The elastic modulus E′ and [...] Read more.
We investigated the tensile properties and deformation behavior at various temperatures of highly strong heat-elongated polypropylene (PP), in which stacks of crystalline lamellae are macroscopically arranged in the elongated direction and lamellae are connected by thin fibrils. The elastic modulus E′ and the αc-relaxation temperature for the onset of crystalline chain motion, obtained through dynamic mechanical analysis, were higher in the heat-elongated than the unelongated PP, indicating the suppression of crystalline chain motion. The heat-elongated PP deformed beyond the yield point at high temperatures above the αc-relaxation point, and it exhibited high tensile stress; e.g., the yield stress was 60 MPa at 120 °C, which was 7.5 times higher than that of the unelongated PP. Small-angle X-ray scattering intensity patterns changed from layered to diffuse, and DSC thermograms showed that melting peak position shifted to lower temperatures when stretching at small strains at various temperatures. The results suggest that lamella fragmentation occurs under small strains at various temperatures. Thus, the good high-temperature strength of the heat-elongated PP is due to the fragmentation of lamellae during small-strain stretching and the suppression of crystalline chain motion by thin crystalline fibrils connected to the lamellae. Full article
(This article belongs to the Special Issue Mechanical Properties and Thermal Analysis of Polymer Materials)
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