• Diamond-Filled Bimodal Polyethylene Composites Derived from Binuclear Titanium FI Catalyst for Marine Cable Insulation

  • Ying Deng, Chunmeng Jiang, Luopeng Huang, Aimin Pan*,† , and Lesly Dasilva Wandji Djouonkep**, ***,†

  • *School of Electronics and Information Engineering, Wuhan Donghu University, Wuhan 430212, China
    **Department of Petroleum Engineering and Applied Chemistry, Yangtze University, Wuhan
    430100, China
    ***Institute of Fine Organic Chemicals & Organic Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China

  • 이핵 티타늄 FI 촉매 유래 다이아몬드 함유 이중모드 폴리에틸렌 복합재료를 이용한 해저 케이블 절연 연구

  • Reproduction, stored in a retrieval system, or transmitted in any form of any part of this publication is permitted only by written permission from the Polymer Society of Korea.

Abstract

A novel binuclear titanium FI catalyst bearing bulky tert-butyl substituents was synthesized from a bisphenol A backbone and applied to ethylene polymerization. When activated with methylaluminoxane (MAO), the catalyst exhibited extremely high activity of 9.8×106 g PE mol-1 Ti h-1, producing genuinely bimodal high-density polyethylene with a weight-average molecular weight of 4.8×105 g mol-1, a polydispersity index of 2.5, and a melting point of 134.2 °C. Composite films (18–40 μm thick) were prepared by melt-compounding the bimodal polyethylene with 10 parts by mass of diamond micropowders (average particle size 1.75–3.75 μm) followed by blown-film extrusion. The resulting diamond-filled composites displayed outstanding dielectric performance (breakdown strength 285–312 kV mm-1, dielectric constant 2.68–2.86 at 1 kHz), high in-plane thermal conductivity (6.1–6.6 Wm-1K-1), and excellent dimensional stability (thermal shrinkage £ 0.42% at 150 °C). These properties surpass those of commercial biaxially oriented polypropylene (BOPP) capacitor films and meet the stringent requirements for next-generation marine power-cable insulation and high-voltage capacitor films. This work highlights the unique combination of a rigid bisphenol-A-bridged binuclear FI catalyst and diamond-filled bimodal polyethylene, providing a new route to advanced insulating materials for demanding electrical applications.


Keywords: binuclear FI catalyst, bimodal polyethylene, diamond-filled composites, dielectric/thermal conductive films, marine cable insulation.

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2024 Impact Factor : 0.6
  • Indexed in SCIE

This Article

  • 2026; 50(3): 431-443

    Published online May 25, 2026

  • 10.7317/pk.2026.50.3.431
  • Received on Nov 6, 2025
  • Revised on Jan 26, 2026
  • Accepted on Jan 27, 2026

Correspondence to

  • Aimin Pan* , Lesly Dasilva Wandji Djouonkep**, ***

  • *School of Electronics and Information Engineering, Wuhan Donghu University, Wuhan 430212, China
    **Department of Petroleum Engineering and Applied Chemistry, Yangtze University, Wuhan
    430100, China
    ***Institute of Fine Organic Chemicals & Organic Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China

  • E-mail: panaimin2025@163.com, dasilvawdl@outlook.com