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Updated: Feb 19, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
Published on: December 16, 2022
A new strain-crystallizable rubber via neodymocene-catalyzed regio-, stereo-, and sequence-selective copolymerization
Jingqing Lyu1, Zhenxing Chen2, Lei Zhu2
1School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, USA. ljia@uakron.edu.
Abstract:
An ansa-neodymocene catalyst previously reported in the literature has been identified to catalyze the title copolymerization to afford poly(1,4-trans-isoprene-ethylene) with 95% selectivity for the major microstructure. Such structural regularity is minimally required for the rubbery product, dubbed isoprene-ethylene rubber (IER), to exhibit prominent strain-induced crystallization (SIC) at 0 °C. The mechanical properties of IER rival those of natural rubber when SIC occurs. The unit cell of the strain-induced crystals is monoclinic with a = 2.21 nm, b = 0.72 nm, c = 1.30 nm, and β = 110.8°. Each unit cell is estimated to contain 12 chains in the ac plane and one repeat unit along the b axis.
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