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Development of a fast and robust analysis technique for determining the key properties in PP-based recyclates and compounds by Crystex technology.

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Title: Development of a fast and robust analysis technique for determining the key properties in PP-based recyclates and compounds by Crystex technology.
Authors: Albrecht, Andreas1 (AUTHOR) andreas.albrecht@borealisgroup.com, del Hierro, Pilar2 (AUTHOR), Wolfger, Pia1 (AUTHOR), Vukušić, Lada1 (AUTHOR), Mileva, Daniela1 (AUTHOR), Jeremic, Ljiljana1 (AUTHOR)
Source: International Journal of Polymer Analysis & Characterization. May2026, Vol. 31 Issue 4, p505-527. 23p.
Subjects: Polyolefins, Intrinsic viscosity, Plastic recycling, Waste recycling, Ethylene compounds, Polymers, Polyethylene
Abstract: Polypropylene (PP)-based recyclates obtained specifically from mechanical recycling are increasingly used and visible in various application, e.g., bottles and containers in non-food applications. A big drawback of mechanical recyclates is that they contain besides the target polymer type, also other polymers and inorganic fillers, which are not soluble under the conditions required for polyolefins. These components make the analysis of recyclates with standard methods difficult. For virgin polypropylenes, it was shown that Crystex (CRYStallization EXtraction) analysis was capable of accurately determining the key properties for PP composition, like the amount of xylene cold soluble (XCS), the ethylene content, and the intrinsic viscosity (IV) of the whole material as well as of the crystalline and amorphous fractions. In this work, defined compounds with the same polypropylene composition but various filler contents were used for proving that the Crystex technique is a suitable analysis technique to determine the key properties of PP-based compounds in a fast and accurate way. Different types of sample preparation for removal of insoluble components prior to Crystex analysis were investigated and validated by different complex compounds, recycled PP, and PP-based compounds containing recycled material. It was concluded that by the usage of a newly developed online filter system, the key parameters in PP-based compounds and recycled PP can be determined without disturbance. Additionally, a new methodology was developed for a more accurate estimation of the non-intended polyethylene (PE) amount that does not originate from heterophasic PP (HECO-PP) in post-consumer recycled (PCR) PP material. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Polymer Analysis & Characterization is the property of Taylor & Francis Ltd 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.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 193364596
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PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Development of a fast and robust analysis technique for determining the key properties in PP-based recyclates and compounds by Crystex technology.
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  Data: <searchLink fieldCode="AR" term="%22Albrecht%2C+Andreas%22">Albrecht, Andreas</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> andreas.albrecht@borealisgroup.com</i><br /><searchLink fieldCode="AR" term="%22del+Hierro%2C+Pilar%22">del Hierro, Pilar</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wolfger%2C+Pia%22">Wolfger, Pia</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vukušić%2C+Lada%22">Vukušić, Lada</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mileva%2C+Daniela%22">Mileva, Daniela</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jeremic%2C+Ljiljana%22">Jeremic, Ljiljana</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Polymer+Analysis+%26+Characterization%22">International Journal of Polymer Analysis & Characterization</searchLink>. May2026, Vol. 31 Issue 4, p505-527. 23p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Polyolefins%22">Polyolefins</searchLink><br /><searchLink fieldCode="DE" term="%22Intrinsic+viscosity%22">Intrinsic viscosity</searchLink><br /><searchLink fieldCode="DE" term="%22Plastic+recycling%22">Plastic recycling</searchLink><br /><searchLink fieldCode="DE" term="%22Waste+recycling%22">Waste recycling</searchLink><br /><searchLink fieldCode="DE" term="%22Ethylene+compounds%22">Ethylene compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Polymers%22">Polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Polyethylene%22">Polyethylene</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Polypropylene (PP)-based recyclates obtained specifically from mechanical recycling are increasingly used and visible in various application, e.g., bottles and containers in non-food applications. A big drawback of mechanical recyclates is that they contain besides the target polymer type, also other polymers and inorganic fillers, which are not soluble under the conditions required for polyolefins. These components make the analysis of recyclates with standard methods difficult. For virgin polypropylenes, it was shown that Crystex (CRYStallization EXtraction) analysis was capable of accurately determining the key properties for PP composition, like the amount of xylene cold soluble (XCS), the ethylene content, and the intrinsic viscosity (IV) of the whole material as well as of the crystalline and amorphous fractions. In this work, defined compounds with the same polypropylene composition but various filler contents were used for proving that the Crystex technique is a suitable analysis technique to determine the key properties of PP-based compounds in a fast and accurate way. Different types of sample preparation for removal of insoluble components prior to Crystex analysis were investigated and validated by different complex compounds, recycled PP, and PP-based compounds containing recycled material. It was concluded that by the usage of a newly developed online filter system, the key parameters in PP-based compounds and recycled PP can be determined without disturbance. Additionally, a new methodology was developed for a more accurate estimation of the non-intended polyethylene (PE) amount that does not originate from heterophasic PP (HECO-PP) in post-consumer recycled (PCR) PP material. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Polymer Analysis & Characterization is the property of Taylor & Francis Ltd 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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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1080/1023666X.2025.2582047
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 23
        StartPage: 505
    Subjects:
      – SubjectFull: Polyolefins
        Type: general
      – SubjectFull: Intrinsic viscosity
        Type: general
      – SubjectFull: Plastic recycling
        Type: general
      – SubjectFull: Waste recycling
        Type: general
      – SubjectFull: Ethylene compounds
        Type: general
      – SubjectFull: Polymers
        Type: general
      – SubjectFull: Polyethylene
        Type: general
    Titles:
      – TitleFull: Development of a fast and robust analysis technique for determining the key properties in PP-based recyclates and compounds by Crystex technology.
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            NameFull: Albrecht, Andreas
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            NameFull: del Hierro, Pilar
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            NameFull: Mileva, Daniela
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            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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