Crystallization Behavior and Mechanical Properties of Semi-crystalline Polymers

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

Deadline for manuscript submissions: 30 June 2025 | Viewed by 1551

Special Issue Editors


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Guest Editor
Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Lodz, Poland
Interests: crystallization of polymers; mechanical properties of polymers; thermal properties of polymers; correlations between crystalline structure and polymer properties; polymer composites and nanocomposites; polymer blends

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Guest Editor
Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Lodz, Poland
Interests: nanofiber; polymer composites; nanomaterials; mechanical properties; semi-crystalline polymers

Special Issue Information

Dear Colleagues,

Polymer crystallization, mechanical properties, and the relationship between the crystalline structure and the behaviour of the deformed polymer have been of interest to researchers for many years. Although the accumulated knowledge on this topic is impressive, many issues remain unsolved, and new polymer materials are being developed that require characterization. Examples of research on crystallization include the following: the effect of shear in melt, nucleation by nanofillers, crystallization in a confined space, the growth of crystals of various polymorphic forms, and the crystallization of biopolymers.

Knowledge of the mechanical properties of a new polymer material is essential if its practical applications are considered. Scientists also study changes in the internal structure of the polymer under the influence of external forces. Research on this topic often involves tensile deformation of polymers, but compression tests and impact tests are equally important.

Crystallization and mechanical properties are related topics because, by modifying the crystalline structure, we change the properties. Both topics are close to us as Guest Editors because we have been researching them for many years. By inviting you to publish in this Special Issue, we hope that you can provide publications of a high scientific level, representing significant progress in the field of crystallization and/or mechanical properties of semi-crystalline polymers.

Prof. Dr. Andrzej Pawlak
Dr. Justyna Krajenta
Guest Editors

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Keywords

  • semi-crystalline polymers
  • crystallization
  • mechanical properties
  • nucleation
  • plastic deformation
  • crystalline structure
  • isothermal and non-isothermal crystallization
  • cold crystallization
  • spherulites

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Published Papers (1 paper)

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Research

19 pages, 3505 KiB  
Article
Crystallization of the β-Form of Polypropylene from the Melt with Reduced Entanglement of Macromolecules
by Justyna Krajenta and Andrzej Pawlak
Polymers 2024, 16(12), 1710; https://doi.org/10.3390/polym16121710 - 15 Jun 2024
Viewed by 1095
Abstract
The influence of decreasing the entanglement density of macromolecules on the crystallization of the β-form of polypropylene was investigated. Polypropylene with seven times less entanglement was obtained from a solution in xylene, and its properties were compared with those of fully entangled polypropylene. [...] Read more.
The influence of decreasing the entanglement density of macromolecules on the crystallization of the β-form of polypropylene was investigated. Polypropylene with seven times less entanglement was obtained from a solution in xylene, and its properties were compared with those of fully entangled polypropylene. To obtain a high β-phase content, the polymer was nucleated using calcium pimelate. In non-isothermal crystallization studies, accelerated growth of β-crystals was found, increasing the crystallization temperature. Also, the isothermal crystallization was fastest in the nucleated, partially disentangled polypropylene. Increased growth rate of spherulites and enhanced nucleation activity in the presence of more mobile macromolecules were responsible for the high rate of melt conversion to crystals in the disentangled polypropylene. It was also observed that the equilibrium melting temperature of β-crystals is lower after disentangling macromolecules. Better conditions for crystal building after reduction of entanglements resulted in enhanced crystallization according to regime II. Full article
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