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Crystallization, thermal, and mechanical properties of ethylene-propylene block copolymer/random copolymer blends.

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Title: Crystallization, thermal, and mechanical properties of ethylene-propylene block copolymer/random copolymer blends.
Authors: Hua, Xia1,2 (AUTHOR) huaxia920@gmail.com, Xue, Qiaonan2 (AUTHOR) 308146515@qq.com, Zhao, Yuzhuo1 (AUTHOR) zhaoyuzhuo2021@smail.sut.edu.cn, Liu, Li-Zhi1 (AUTHOR) violetlj@yahoo.com, Wang, Yuanxia2 (AUTHOR) wangyuanxia@aliyun.com, Shi, Ying2,3 (AUTHOR) shiying86@aliyun.com, Zhang, Qi4 (AUTHOR) zhangqi@sut.edu.cn, Qiu, Ying5 (AUTHOR) qiuying1222@mails.jlu.edu.cn
Source: Journal of Polymer Research. Apr2025, Vol. 32 Issue 4, p1-13. 13p.
Subjects: Random copolymers, Differential scanning calorimetry, Block copolymers, Physical sciences, X-ray scattering
Abstract: The development of ethylene-propylene block copolymers (PP-b-PE) via chain-shuttling catalysis technology presents new opportunities for polyolefin modification, offering advantages over conventional ethylene-propylene random copolymers (EPC). However, the synergistic effects and property optimization in PP-b-PE/EPC blend systems remain insufficiently understood, particularly concerning crystallization behavior and phase morphology. This study systematically investigates the crystallization, phase structure, and mechanical properties of PP-b-PE/EPC blends with varying compositions using differential scanning calorimetry (DSC), synchrotron X-ray scattering (SAXS/WAXD), scanning electron microscopy (SEM), polarized optical microscopy (POM), and mechanical testing. DSC analysis reveals complex melting behavior and enhanced crystallization attributed to nucleation effects, notably in the 10:90 blend. SAXS results show PP-b-PE-rich blends maintain a dominant PE lamellar structure with a long period of approximately 18.47 nm, while intermediate compositions exhibit dual PE and PP lamellar structures. WAXD confirms the formation of both α and γ crystal forms, with the γ-phase becoming particularly prominent at the 50:50 blend ratio, corresponding to optimal impact strength (18.60 kJ/m2). These findings elucidate the interplay between composition, crystallization, and properties, providing valuable insights into structure–property relationships in polyolefin blends and advancing the development of high-performance materials through synergistic interactions and strategic composition control. [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: Crystallization, thermal, and mechanical properties of ethylene-propylene block copolymer/random copolymer blends.
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  Data: <searchLink fieldCode="AR" term="%22Hua%2C+Xia%22">Hua, Xia</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> huaxia920@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Xue%2C+Qiaonan%22">Xue, Qiaonan</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> 308146515@qq.com</i><br /><searchLink fieldCode="AR" term="%22Zhao%2C+Yuzhuo%22">Zhao, Yuzhuo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> zhaoyuzhuo2021@smail.sut.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Liu%2C+Li-Zhi%22">Liu, Li-Zhi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> violetlj@yahoo.com</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Yuanxia%22">Wang, Yuanxia</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> wangyuanxia@aliyun.com</i><br /><searchLink fieldCode="AR" term="%22Shi%2C+Ying%22">Shi, Ying</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<i> shiying86@aliyun.com</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Qi%22">Zhang, Qi</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> zhangqi@sut.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Qiu%2C+Ying%22">Qiu, Ying</searchLink><relatesTo>5</relatesTo> (AUTHOR)<i> qiuying1222@mails.jlu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Polymer+Research%22">Journal of Polymer Research</searchLink>. Apr2025, Vol. 32 Issue 4, p1-13. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Random+copolymers%22">Random copolymers</searchLink><br /><searchLink fieldCode="DE" term="%22Differential+scanning+calorimetry%22">Differential scanning calorimetry</searchLink><br /><searchLink fieldCode="DE" term="%22Block+copolymers%22">Block copolymers</searchLink><br /><searchLink fieldCode="DE" term="%22Physical+sciences%22">Physical sciences</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+scattering%22">X-ray scattering</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The development of ethylene-propylene block copolymers (PP-b-PE) via chain-shuttling catalysis technology presents new opportunities for polyolefin modification, offering advantages over conventional ethylene-propylene random copolymers (EPC). However, the synergistic effects and property optimization in PP-b-PE/EPC blend systems remain insufficiently understood, particularly concerning crystallization behavior and phase morphology. This study systematically investigates the crystallization, phase structure, and mechanical properties of PP-b-PE/EPC blends with varying compositions using differential scanning calorimetry (DSC), synchrotron X-ray scattering (SAXS/WAXD), scanning electron microscopy (SEM), polarized optical microscopy (POM), and mechanical testing. DSC analysis reveals complex melting behavior and enhanced crystallization attributed to nucleation effects, notably in the 10:90 blend. SAXS results show PP-b-PE-rich blends maintain a dominant PE lamellar structure with a long period of approximately 18.47 nm, while intermediate compositions exhibit dual PE and PP lamellar structures. WAXD confirms the formation of both α and γ crystal forms, with the γ-phase becoming particularly prominent at the 50:50 blend ratio, corresponding to optimal impact strength (18.60 kJ/m2). These findings elucidate the interplay between composition, crystallization, and properties, providing valuable insights into structure–property relationships in polyolefin blends and advancing the development of high-performance materials through synergistic interactions and strategic composition control. [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/s10965-025-04337-9
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        Text: English
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        PageCount: 13
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      – SubjectFull: Random copolymers
        Type: general
      – SubjectFull: Differential scanning calorimetry
        Type: general
      – SubjectFull: Block copolymers
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      – SubjectFull: Physical sciences
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      – SubjectFull: X-ray scattering
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      – TitleFull: Crystallization, thermal, and mechanical properties of ethylene-propylene block copolymer/random copolymer blends.
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            – D: 01
              M: 04
              Text: Apr2025
              Type: published
              Y: 2025
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