Processability and Structure of Dynamically Modified Linear Low-density Polyethylene with Different Branching Contents Using a High Peroxide Content

Jun-Jin Duan; Yan-Qin Huang; Fu-Qing Wei; Yan Gao; Fu-Shan Wang; Jia-Chun Feng

doi:10.1007/s10118-025-3466-8

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Processability and Structure of Dynamically Modified Linear Low-density Polyethylene with Different Branching Contents Using a High Peroxide Content

RESEARCH ARTICLE | Updated：2026-01-13

- Processability and Structure of Dynamically Modified Linear Low-density Polyethylene with Different Branching Contents Using a High Peroxide Content
- Chinese Journal of Polymer Science Vol. 44, Issue 1, Pages: 87-99(2026)
- Affiliations：
  
  a.State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
  b.Lanzhou Petrochemical Research Center, Petrochemical Research Institute of PetroChina, Lanzhou 730060, China
  c.Lanzhou Petrochemical Corporation of PetroChina, Lanzhou 730060, China
- Author bio：
  
  jcfeng@fudan.edu.cn
- Funds：
- DOI：10.1007/s10118-025-3466-8
  CLC： [M
- Received：27 August 2025，
  
  Accepted：27 September 2025，
  
  Online First：17 December 2025，
  
  Published：15 January 2026
- Accepted：
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Duan, J. J.; Huang, Y. Q.; Wei, F. Q.; Gao, Y.; Wang, F. S.; Feng, J. C. Processability and structure of dynamically modified linear low-density polyethylene with different branching contents using a high peroxide content. Chinese J. Polym. Sci. 2026, 44, 87–99

Jun-Jin Duan, Yan-Qin Huang, Fu-Qing Wei, et al. Processability and Structure of Dynamically Modified Linear Low-density Polyethylene with Different Branching Contents Using a High Peroxide Content[J]. Chinese Journal of Polymer Science, 2026, 44(1): 87-99.
Duan, J. J.; Huang, Y. Q.; Wei, F. Q.; Gao, Y.; Wang, F. S.; Feng, J. C. Processability and structure of dynamically modified linear low-density polyethylene with different branching contents using a high peroxide content. Chinese J. Polym. Sci. 2026, 44, 87–99 DOI： 10.1007/s10118-025-3466-8.

Jun-Jin Duan, Yan-Qin Huang, Fu-Qing Wei, et al. Processability and Structure of Dynamically Modified Linear Low-density Polyethylene with Different Branching Contents Using a High Peroxide Content[J]. Chinese Journal of Polymer Science, 2026, 44(1): 87-99. DOI： 10.1007/s10118-025-3466-8.

摘要

Processability and structure of dynamically modified four linear low-density polyethylenes (LLDPEs) with different branch contents using peroxide were investigated. It was found that

all samples were processable

and higher short-chain branch content led to better flowability

less cross-linked fractions

and lower grafting ratio of peroxide radicals onto the chains.

Abstract

Dynamic melt modification of polyethylene

via

the direct grafting of peroxide fragments shows promise for the development of processable functionalized materials. In this study

four linear low-density polyethylenes (LLDPEs) with comparable molecular weights but different short-chain branch (SCB) contents (ranging of 5–66 per 1000 carbon atoms) were modified

via

dynamic melt mixing using 2 wt% benzoyl peroxide at 145 °C and 50 r/min for 30 min. The influence of SCB content on the processability and structure of the resulting products was systematically investigated. All modified products exhibited good melt processability with melt flow rates (MFR) ranging from 0.46 g/10min to 1.07 g/10min. Products derived from low-SCB LLDPEs showed a lower MFR

higher cross-linking content

a larger number of long-chain branches

and a higher degree of benzoyl grafting. In contrast

those produced from high-SCB LLDPEs exhibited improved processability

reduced cross-linking

fewer long-chain branches

and lower benzoyl grafting levels. A detailed structural investigation of the soluble and insoluble fractions

which were separated using trichlorobenzene fractionation

was conducted to analyze the structural features of various modified products and demonstrate that the SCB content

(i.e.

tertiary carbon density) significantly influences radical coupling during dynamic modification. Elevated tertiary carbon density

by introducing greater steric hindrance

suppresses radical coupling during dynamic modification

thereby reducing the efficiency of both crosslinking and peroxide fragment grafting. These findings provide new insights into the structure-reactivity relationships in peroxide-induced polyethylene modification and lay the foundation for tailoring material properties

via

dynamic processing.

关键词

Keywords

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