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Bielawski, Christopher W.
Synthetic Materials & Macromolecules
Research Interests
  • Synthetic chemistry, materials science, polymer chemistry, catalysis, carbon-based materials

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Hydrogenated Poly(Dewar benzene): A Compact Cyclic Olefin Polymer with Enhanced Thermomechanical Properties

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Title
Hydrogenated Poly(Dewar benzene): A Compact Cyclic Olefin Polymer with Enhanced Thermomechanical Properties
Author
Seo, JinwonLee, Stanfield Y.Bielawski, Christopher W.
Issue Date
2020-04
Publisher
AMER CHEMICAL SOC
Citation
MACROMOLECULES, v.53, no.8, pp.3202 - 3208
Abstract
Dihydro Dewar benzene(bicyclo[2.2.0]hex-2-ene) was synthesized and polymerized using the Grubbs third generation catalyst. The corresponding ring-opening metathesis polymerization proceeded in a controlled manner, as determined by a linear relationship between the molecular weight of the polymer produced and the monomer-to-catalyst feed ratio as well as an ability to extend polymer chains through exposure to an additional monomer. Subsequent treatment with tosylhydrazide afforded the corresponding hydrogenated derivative. The hydrogenated polymer was found to exhibit high melting and decomposition temperatures as well as a relatively high Young's modulus when compared to other polyolefins [e.g., hydrogenated poly(norbornene) and poly(ethylene)]. The enhanced thermal and mechanical properties were found to originate from a relatively low phase transition entropy combined with high polymer crystallinity, features that were attributed to restricted bond rotation within the repeating units of the hydrogenated polymer.
URI
https://scholarworks.unist.ac.kr/handle/201301/32208
URL
https://pubs.acs.org/doi/10.1021/acs.macromol.0c00342
DOI
10.1021/acs.macromol.0c00342
ISSN
0024-9297
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