Critical Role of Ethylene-Propylene Block Copolymer in Impact Polypropylene Copolymer

Yu-Hui Tang; Na Zhang; Wei Bao; Wei Jiang; Yuan Lin; Zhao-Hui Su

doi:10.1007/s10118-023-3058-4

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Critical Role of Ethylene-Propylene Block Copolymer in Impact Polypropylene Copolymer

RESEARCH ARTICLE | Updated：2024-02-20

- Critical Role of Ethylene-Propylene Block Copolymer in Impact Polypropylene Copolymer
- Critical Role of Ethylene-Propylene Block Copolymer in Impact Polypropylene Copolymer
- 高分子科学（英文版） 2024年42卷第3期页码：344-351
- Affiliations：
  
  a.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  b.School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China
- Author bio：
  
  zhsu@ciac.ac.cn
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (No. 52073277) and the Science and Technology Department of Fujian Province (No. 2020HZ06019).
- DOI：10.1007/s10118-023-3058-4
  中图分类号：
- 收稿：2023-07-13，
  
  修回：2023-9-25，
  
  录用：2023-10-9，
  
  网络首发：2023-11-10，
  
  纸质出版：2024-03-01
- Accepted：
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Tang, Y. H.; Zhang, N.; Bao, W.; Jiang, W.; Lin, Y.; Su, Z. H. Critical role of ethylene-propylene block copolymer in impact polypropylene copolymer. Chinese J. Polym. Sci. 2024, 42, 344–351

Yu-Hui Tang, Na Zhang, Wei Bao, et al. Critical Role of Ethylene-Propylene Block Copolymer in Impact Polypropylene Copolymer[J]. Chinese Journal of Polymer Science, 2024, 42(3): 344-351.
Tang, Y. H.; Zhang, N.; Bao, W.; Jiang, W.; Lin, Y.; Su, Z. H. Critical role of ethylene-propylene block copolymer in impact polypropylene copolymer. Chinese J. Polym. Sci. 2024, 42, 344–351 DOI： 10.1007/s10118-023-3058-4.

Yu-Hui Tang, Na Zhang, Wei Bao, et al. Critical Role of Ethylene-Propylene Block Copolymer in Impact Polypropylene Copolymer[J]. Chinese Journal of Polymer Science, 2024, 42(3): 344-351. DOI： 10.1007/s10118-023-3058-4.

摘要

EbP with long PP blocks forms an outer shell for the rubber particles

which reduces the interfacial tension between the rubber and the PP matrix

resulting to smaller particle sizes and more effective toughening.

Abstract

Ethylene-propylene block copolymer (EbP) is a vital component in impact polypropylene copolymer (IPC)

yet its distribution in the multiphase composite material and how it influences the phase structure and the mechanical properties are not well understood. In this work

four IPCs were investigated by atomic force microscopy-infrared (AFM-IR) to assess the phase compositions

in situ

based on which in conjunction with the chain microstructure information obtained

ex situ

the distributions of the copolymer components were derived for each alloy. For the IPCs whose EbP comprises long P and long E segments

the EbP fraction was found to phase separate from the rubber and the PP matrix to form the cores of the disperse particles with the E-P segmented copolymer (EsP). In contrast

in the IPC with EbP composed of long P and short E segments

the EbP fraction formed an outer shell for the rubber particles with the cores comprising the EsP alone

and this IPC

containing a lower E comonomer content than its counterpart

exhibited both better impact resistance and higher flexural modulus. These results clarify how the chain structure of EbP governs the phase morphology in IPC

which in turn impacts the properties of the composite material.

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