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Dominant Role of Polypropylene Chain Architecture in Differentiating Flame Retardancy and Mechanical Performance.

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Title: Dominant Role of Polypropylene Chain Architecture in Differentiating Flame Retardancy and Mechanical Performance.
Authors: Yin, Shu1,2 (AUTHOR), Guo, Menghan1,2 (AUTHOR), Wang, Hao1,2 (AUTHOR), Wang, Lin1,2 (AUTHOR), Li, Xiangmei1,2 (AUTHOR) bjlglxm@bit.edu.cn, He, Jiyu1,2 (AUTHOR)
Source: Polymers (20734360). Jun2026, Vol. 18 Issue 11, p1356. 17p.
Subjects: Polypropylene, Polymer structure, Composite materials, Morphology, Polymer melting, Fire resistant polymers, Fireproofing, Mechanical behavior of materials
Abstract: Achieving a synergistic improvement in flame retardancy and mechanical performance remains a persistent challenge in intumescent flame-retardant (IFR) polypropylene (PP) systems. Previous studies have predominantly focused on optimizing flame retardant formulations while largely overlooking the critical role of polymer matrix chain architecture in determining the overall composite performance. In this work, three PP matrices with distinct chain architectures—homopolymer (hPP), random copolymer (rPP), and block copolymer (bPP)—were systematically investigated within an identical IFR formulation. The results reveal a dominant role of chain architecture in differentiating flame retardancy and mechanical performance, which are governed by distinct structural factors, namely melt rheological behavior and phase morphology. Specifically, bPP exhibits superior flame retardancy, as evidenced by a higher limiting oxygen index (LOI) and improved UL 94 rating, which may be associated with its higher melt viscosity and resistance to dripping during combustion. In contrast, rPP shows significantly improved mechanical performance, owing to its more homogeneous phase structure and enhanced chain mobility. These findings demonstrate that flame retardancy and mechanical properties can be effectively tuned through different structural pathways, providing a viable strategy to mitigate the conventional trade-off in IFR systems. This work highlights the importance of polymer chain architecture as a complementary design parameter alongside flame retardant additives for developing high-performance PP composites. [ABSTRACT FROM AUTHOR]
Copyright of Polymers (20734360) is the property of MDPI 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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DbLabel: Engineering Source
An: 194587620
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  Data: Dominant Role of Polypropylene Chain Architecture in Differentiating Flame Retardancy and Mechanical Performance.
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  Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Jun2026, Vol. 18 Issue 11, p1356. 17p.
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  Data: <searchLink fieldCode="DE" term="%22Polypropylene%22">Polypropylene</searchLink><br /><searchLink fieldCode="DE" term="%22Polymer+structure%22">Polymer structure</searchLink><br /><searchLink fieldCode="DE" term="%22Composite+materials%22">Composite materials</searchLink><br /><searchLink fieldCode="DE" term="%22Morphology%22">Morphology</searchLink><br /><searchLink fieldCode="DE" term="%22Polymer+melting%22">Polymer melting</searchLink><br /><searchLink fieldCode="DE" term="%22Fire+resistant+polymers%22">Fire resistant polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Fireproofing%22">Fireproofing</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink>
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  Label: Abstract
  Group: Ab
  Data: Achieving a synergistic improvement in flame retardancy and mechanical performance remains a persistent challenge in intumescent flame-retardant (IFR) polypropylene (PP) systems. Previous studies have predominantly focused on optimizing flame retardant formulations while largely overlooking the critical role of polymer matrix chain architecture in determining the overall composite performance. In this work, three PP matrices with distinct chain architectures—homopolymer (hPP), random copolymer (rPP), and block copolymer (bPP)—were systematically investigated within an identical IFR formulation. The results reveal a dominant role of chain architecture in differentiating flame retardancy and mechanical performance, which are governed by distinct structural factors, namely melt rheological behavior and phase morphology. Specifically, bPP exhibits superior flame retardancy, as evidenced by a higher limiting oxygen index (LOI) and improved UL 94 rating, which may be associated with its higher melt viscosity and resistance to dripping during combustion. In contrast, rPP shows significantly improved mechanical performance, owing to its more homogeneous phase structure and enhanced chain mobility. These findings demonstrate that flame retardancy and mechanical properties can be effectively tuned through different structural pathways, providing a viable strategy to mitigate the conventional trade-off in IFR systems. This work highlights the importance of polymer chain architecture as a complementary design parameter alongside flame retardant additives for developing high-performance PP composites. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Polymers (20734360) is the property of MDPI 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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        Value: 10.3390/polym18111356
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      – Code: eng
        Text: English
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        PageCount: 17
        StartPage: 1356
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      – SubjectFull: Polymer structure
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      – SubjectFull: Composite materials
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      – SubjectFull: Morphology
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      – SubjectFull: Polymer melting
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      – SubjectFull: Fire resistant polymers
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      – SubjectFull: Fireproofing
        Type: general
      – SubjectFull: Mechanical behavior of materials
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      – TitleFull: Dominant Role of Polypropylene Chain Architecture in Differentiating Flame Retardancy and Mechanical Performance.
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            NameFull: Yin, Shu
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            NameFull: Guo, Menghan
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            NameFull: Wang, Hao
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            NameFull: Wang, Lin
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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