Synthesis of narrow-distribution 'perfect' polyethylene and its block copolymers by polymerization of cyclopentene

Scott T. Trzaska, Li Bong W. Lee, Richard A. Register

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73 Scopus citations


Polycyclopentene with controllable molecular weight and polydispersity below 1.1 was obtained by ring-opening metathesis polymerization (ROMP) of cyclopentene at room temperature using a commercial Mo-based ROMP initiator in the presence of trimethylphosphine. Polydispersities were kept low by limiting the degree of cyclopentene conversion. These narrow-distribution polycyclopentenes were catalytically hydrogenated to narrow-distribution linear polyethylenes, providing a facile route to model polyethylenes free from both short- and long-chain branching. The 'living' nature of ROMP also permits the synthesis of well-defined diblock copolymers containing polycyclopentene, including poly-(ethylidenenorbornene)-polycyclopentene diblocks. The hydrogenated derivatives of these diblocks represent a new type of crystalline-amorphous diblock, possessing much higher levels of crystallinity than when block copolymers containing anionically polymerized high-1,4-polybutadiene are hydrogenated.

Original languageEnglish (US)
Pages (from-to)9215-9221
Number of pages7
Issue number25
StatePublished - Dec 12 2000

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


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