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. |
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| 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] |
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| Database: | Engineering Source |
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| 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] |
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| ISSN: | 10229760 |
| DOI: | 10.1007/s10965-025-04337-9 |
