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<p>Cyclic olefin copolymers (COCs) are highly valuable optical resins, but their productions on industry are fully limited by the monomer norbornene. Although ethylene/dicyclopentadiene (E/DCPD) copolymers provide a cost-effective alternative to commercially available COCs because of using low-cost DCPD as cyclic olefin monomer, these inherent unsaturated double bonds on E/DCPD copolymers cause low heat resistance, oxidation, and crosslinking during processing and storage. And E/DCPD copolymers usually showed lower glass-transition temperature (<i>T</i><sub>g</sub>) compared with commercially available COCs. In this study, we studied the E-DCPD copolymerization catalyzed by a scandium complex and the sequential hydrogenation catalyzed by a nickel compound to prepare saturated copolymers H-(E/DCPD). The polymerization activities are high up to 5.86×10<sup>6</sup> g/(mol<sub>Sc</sub>·h), and the resultant H-(E/DCPD) copolymers showed narrow polymer dispersity index (PDI=1.5–2.0). By changing the polymerization conditions, a series of H-(E/DCPD) copolymers with tunable DCPD incorporation (28.4 mol%–44.9 mol%) and a wide range of <i>T</i><sub>g</sub> (123–171 °C) were obtained. H-(E/DCPD) copolymers exhibited excellent optical properties (transparency &gt;90%, refractive index of 1.543), similar to those of commercial COCs, making them an alternative for high-performance optical applications. This method solves the problems of traditional E/DCPD copolymers and provides a practical way to produce stable and low-cost COCs, and is comparable with commercially available COC resins.</p>

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Preparation of Cyclic Olefin Copolymers with High Glass-transition Temperature via Ethylene/Dicyclopentadiene Copolymerization and Subsequent Hydrogenation

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Shu-Nan Zhang,
  • Ling-Yan Huang,
  • Pan He,
  • Chun-Ji Wu,
  • Bao-Li Wang

摘要

Cyclic olefin copolymers (COCs) are highly valuable optical resins, but their productions on industry are fully limited by the monomer norbornene. Although ethylene/dicyclopentadiene (E/DCPD) copolymers provide a cost-effective alternative to commercially available COCs because of using low-cost DCPD as cyclic olefin monomer, these inherent unsaturated double bonds on E/DCPD copolymers cause low heat resistance, oxidation, and crosslinking during processing and storage. And E/DCPD copolymers usually showed lower glass-transition temperature (Tg) compared with commercially available COCs. In this study, we studied the E-DCPD copolymerization catalyzed by a scandium complex and the sequential hydrogenation catalyzed by a nickel compound to prepare saturated copolymers H-(E/DCPD). The polymerization activities are high up to 5.86×106 g/(molSc·h), and the resultant H-(E/DCPD) copolymers showed narrow polymer dispersity index (PDI=1.5–2.0). By changing the polymerization conditions, a series of H-(E/DCPD) copolymers with tunable DCPD incorporation (28.4 mol%–44.9 mol%) and a wide range of Tg (123–171 °C) were obtained. H-(E/DCPD) copolymers exhibited excellent optical properties (transparency >90%, refractive index of 1.543), similar to those of commercial COCs, making them an alternative for high-performance optical applications. This method solves the problems of traditional E/DCPD copolymers and provides a practical way to produce stable and low-cost COCs, and is comparable with commercially available COC resins.