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<p>Mechanochromic polyolefins represent a novel class of functionalized polyolefins, which still remains significant challenges. Pd(II)-catalyzed coordination-insertion copolymerization is a feasible method for achieving this kind of polymers, yet with linear microstructures. Ring-opening metathesis polymerization (ROMP) offers another promising avenue for affording functionalized polyolefins. This method exhibits high polar group tolerance and the ability to precisely regulate polymer branches. In this study, we report the method for producing mechanochromic branched polyethylenes <i>via</i> ROMP. By employing the terpolymerization of a well-designed monomer containing the mechanochromic group, <b>NB-ABF</b>, with cyclooctene (<b>COE</b>) and long-chain 5-hexylcyclooctene (<b>COE-C6</b>), following by hydrogenation process, we synthesized a range of functionalized branched polyethylenes characterized by varied branching density and polar monomer incorporation. These polymers bear a structural resemblance to functionalized ethylene-octene copolymers. After crosslinking, mechanochromophores are generated, and mechanochromism is achieved in uniaxial tensile testing. A comprehensive assessment reveals that both the incorporation of polar monomers and variations in branching density significantly influence their mechanical properties. Notably, upon stretching, these materials display pronounced visible color change, confirming the successful development of mechanochromic branched polyethylenes.</p>

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Mechanochromic Branched Polyethylenes Synthesized through Ring-opening Metathesis Terpolymerization

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Yan-Lin Zong,
  • Yi-Xin Zhang,
  • Zhong-Bao Jian

摘要

Mechanochromic polyolefins represent a novel class of functionalized polyolefins, which still remains significant challenges. Pd(II)-catalyzed coordination-insertion copolymerization is a feasible method for achieving this kind of polymers, yet with linear microstructures. Ring-opening metathesis polymerization (ROMP) offers another promising avenue for affording functionalized polyolefins. This method exhibits high polar group tolerance and the ability to precisely regulate polymer branches. In this study, we report the method for producing mechanochromic branched polyethylenes via ROMP. By employing the terpolymerization of a well-designed monomer containing the mechanochromic group, NB-ABF, with cyclooctene (COE) and long-chain 5-hexylcyclooctene (COE-C6), following by hydrogenation process, we synthesized a range of functionalized branched polyethylenes characterized by varied branching density and polar monomer incorporation. These polymers bear a structural resemblance to functionalized ethylene-octene copolymers. After crosslinking, mechanochromophores are generated, and mechanochromism is achieved in uniaxial tensile testing. A comprehensive assessment reveals that both the incorporation of polar monomers and variations in branching density significantly influence their mechanical properties. Notably, upon stretching, these materials display pronounced visible color change, confirming the successful development of mechanochromic branched polyethylenes.