Miscible and Immiscible Polymer Blends: Achievements and Development Perspectives

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

Deadline for manuscript submissions: 15 October 2024 | Viewed by 3187

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Guest Editor
Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Lodz, Poland
Interests: polymers; nanocomposites; polymer blends; materials science; shape memory effect; severe plastic deformation; lattice structure; 3D printing
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Special Issue Information

Dear Colleagues,

The mixing of two or more polymers is an aspect of technology that has recently received special attention, since mixing represents a new, simple, and efficient method to obtain advanced materials with special properties that cannot be found in individual components. Moreover, contemporary development of new materials with improved properties to meet more stringent and diverse requirements seems to rely more on blending and compounding than on the synthesis of new chemical polymers. The importance of a better understanding of both the theoretical and practical aspects of blending is therefore undeniable. By mixing at least two polymers, miscible, immiscible, or partially miscible blends can be obtained. In many cases, the polymers are immiscible (i.e., compatible) because the thermodynamic parameters—particularly the entropy and enthalpy of mixing—are unfavorable. For this reason, miscibility or phase separation studies are essential. The purpose of this Special Issue is to present in a comprehensive and updated fashion new advances in the preparation of miscible/immiscible blends, in the understanding of the physical mechanisms of mixing miscible/immiscible polymers, in the control of their structure and properties, and in the possibilities of their practical application.

Dr. Yuri Voznyak
Guest Editor

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Keywords

  • polymer blends
  • compatibilization and non-compatibilization blending strategies
  • mixing mechanisms and theory
  • mechanics of mixing
  • mechanical and functional properties

Published Papers (2 papers)

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Research

13 pages, 4619 KiB  
Article
On the Mechanical, Thermal, and Rheological Properties of Polyethylene/Ultra-High Molecular Weight Polypropylene Blends
by Vishal Gavande, Mingi Jeong and Won-Ki Lee
Polymers 2023, 15(21), 4236; https://doi.org/10.3390/polym15214236 - 26 Oct 2023
Cited by 2 | Viewed by 1511
Abstract
The novel ultra-high molecular weight polypropylene (UHMWPP) as a dispersed component was melt blended with conventional high-density polyethylene (PE) and maleic anhydride grafted-polyethylene (mPE) in different proportions through a kneader. Ultra-high molecular weight polypropylene is a high-performance polymer material that has excellent mechanical [...] Read more.
The novel ultra-high molecular weight polypropylene (UHMWPP) as a dispersed component was melt blended with conventional high-density polyethylene (PE) and maleic anhydride grafted-polyethylene (mPE) in different proportions through a kneader. Ultra-high molecular weight polypropylene is a high-performance polymer material that has excellent mechanical properties and toughness compared to other polymers. Mechanical, thermal, and rheological properties were presented for various UHMWPP loadings, and correlations between mechanical and rheological properties were examined. Optimal comprehensive mechanical properties are achieved when the UHMWPP content reaches approximately 50 wt%, although the elongation properties do not match those of pure PE or mPE. However, it is worth noting that the elongation properties of these blends did not match those of PE or mPE. Particularly, for the PE/UHMWPP blends, a significant drop in tensile strength was observed as the UHMWPP content decreased (from 30.24 MPa for P50U50 to 13.12 MPa for P90U10). In contrast, the mPE/UHMWPP blends demonstrated only minimal changes in tensile strength (ranging from 29 MPa for mP50U50 to 24.64 MPa for mP90U10) as UHMWPP content varied. The storage modulus of the PE/UHMWPP blends increased drastically with the UHMWPP content due to the UHMWPP chain entanglements and rigidity. Additionally, we noted a substantial reduction in the melt index of the blend system when the UHMWPP content exceeded 10% by weight. Full article
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15 pages, 11468 KiB  
Article
Phase-Separated Structure of NBR/PVC Blends with Different Acrylonitrile Contents Investigated Using STEM–EDS Mapping Analysis
by Yuka Komori, Aoi Taniguchi, Haruhisa Shibata, Shinya Goto and Hiromu Saito
Polymers 2023, 15(16), 3343; https://doi.org/10.3390/polym15163343 - 9 Aug 2023
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Abstract
We investigated the phase-separated structure of nitrile butadiene rubber (NBR)/polyvinyl chloride (PVC) blends with different acrylonitrile (AN) contents in the NBR, using dynamic mechanical analysis measurements and scanning-transmission-electron-microscopy (STEM)–energy-dispersive-X-ray-spectroscopy (EDS) elemental analysis. Two separate sharp tan δ peaks were observed in the blend [...] Read more.
We investigated the phase-separated structure of nitrile butadiene rubber (NBR)/polyvinyl chloride (PVC) blends with different acrylonitrile (AN) contents in the NBR, using dynamic mechanical analysis measurements and scanning-transmission-electron-microscopy (STEM)–energy-dispersive-X-ray-spectroscopy (EDS) elemental analysis. Two separate sharp tan δ peaks were observed in the blend at the lower AN content of 18.0%, whereas a broad peak was observed in the blends with the higher AN contents of 29.0 and 33.5%, due to the increase in miscibility, as expected from the decrease in the solubility parameter difference with the increasing AN content. The STEM–EDS elemental analysis for the concentration distribution showed that the NBR was mixed in the large PVC domains with a diameter of several micrometers, and the excluded PVC existed around the interface of the domain–matrix phases in the blend with the lower AN content, whereas small domains with a diameter of several tens of nanometers were dispersed in the blend with the higher AN content. The concentration difference in PVC between the PVC domain and the NBR matrix became smaller with increasing miscibility as the AN content increased although the blends contained the same PVC content of 40 wt%. Full article
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