Influence of xylite fibers, reprocessing and free radicals on the properties and structure of polypropylen compoesites.

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Title: Influence of xylite fibers, reprocessing and free radicals on the properties and structure of polypropylen compoesites.
Authors: Szymańska, Joanna1 (AUTHOR) joanna.szymanska@doctorate.put.poznan.pl, Ostrowski, Adam2 (AUTHOR), Paukszta, Dominik1 (AUTHOR)
Source: Journal of Polymer Research. Nov2025, Vol. 32 Issue 11, p1-12. 12p.
Abstract: Polypropylene-based composites reinforced with xylite filler, a natural carbonaceous material derived from brown coal, were investigated with a focus on their recyclability and structural integrity after multiple processing cycles. The study aimed to evaluate the effects of six mechanical recycling cycles on the thermal, mechanical, and structural properties of polypropylene composites containing 25 wt% xylite filler. Samples were produced through extrusion and injection molding, and subsequently analyzed using WAXS, DSC, EPR spectroscopy, microscopy, and mechanical testing. The results revealed that while xylite does not significantly influence the crystallization kinetics of the polypropylene matrix, successive recycling improved filler dispersion and increased the degree of crystallinity and β-phase content. The presence of thermally induced free radicals in the composites, detected via EPR, was stable across recycling cycles and contributed to enhanced filler-matrix interfacial adhesion. Despite minor reductions in tensile strength and impact resistance, the composites maintained consistent mechanical performance throughout reprocessing. These findings support the feasibility of using xylite-filled polypropylene composites in applications aligned with circular economy and sustainability principles, demonstrating their potential for multiple life cycles without substantial degradation in material properties. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Polymer Research is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Influence of xylite fibers, reprocessing and free radicals on the properties and structure of polypropylen compoesites.
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  Data: <searchLink fieldCode="AR" term="%22Szymańska%2C+Joanna%22">Szymańska, Joanna</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> joanna.szymanska@doctorate.put.poznan.pl</i><br /><searchLink fieldCode="AR" term="%22Ostrowski%2C+Adam%22">Ostrowski, Adam</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Paukszta%2C+Dominik%22">Paukszta, Dominik</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Polymer+Research%22">Journal of Polymer Research</searchLink>. Nov2025, Vol. 32 Issue 11, p1-12. 12p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Polypropylene-based composites reinforced with xylite filler, a natural carbonaceous material derived from brown coal, were investigated with a focus on their recyclability and structural integrity after multiple processing cycles. The study aimed to evaluate the effects of six mechanical recycling cycles on the thermal, mechanical, and structural properties of polypropylene composites containing 25 wt% xylite filler. Samples were produced through extrusion and injection molding, and subsequently analyzed using WAXS, DSC, EPR spectroscopy, microscopy, and mechanical testing. The results revealed that while xylite does not significantly influence the crystallization kinetics of the polypropylene matrix, successive recycling improved filler dispersion and increased the degree of crystallinity and β-phase content. The presence of thermally induced free radicals in the composites, detected via EPR, was stable across recycling cycles and contributed to enhanced filler-matrix interfacial adhesion. Despite minor reductions in tensile strength and impact resistance, the composites maintained consistent mechanical performance throughout reprocessing. These findings support the feasibility of using xylite-filled polypropylene composites in applications aligned with circular economy and sustainability principles, demonstrating their potential for multiple life cycles without substantial degradation in material properties. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Polymer Research is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10965-025-04627-2
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              M: 11
              Text: Nov2025
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