Poly(phenylnorbornene) from Ring-Opening Metathesis and Its Hydrogenated Derivatives

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Novel polymers are synthesized from 5-phenyl-2-norbornene (PhNb) and its saturated side group analog, 5-cyclohexyl-2-norbornene, using ring-opening metathesis polymerization (ROMP). Polymers of both endo-rich and all-exo PhNb show glass transition temperatures (Tg) = 88 +/- 1 degrees C, indicating a negligible effect of monomer stereoisomerism on segmental packing or the energy barriers to motion at the glass transition, despite the substantial size of the side group. Post-polymerization hydrogenation of the PhNb polymers using catalysts with different selectivities reveals that saturation of the backbone produces a 17 degrees C decrease in Tg (for both aromatic and cycloaliphatic side groups), whereas saturation of the side groups produces a 14 degrees C increase in Tg (for both saturated and unsaturated backbones).
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2012-10
Language
English
Article Type
Article
Keywords

ALKYL NORBORNENE DICARBOXYIMIDES; GLASS-TRANSITION TEMPERATURE; WELL-DEFINED INITIATORS; MOLECULAR-WEIGHT; POLYMERIZATION; COMPLEXES; CATALYSTS; POLYMERS; POLY(1,3-CYCLOPENTYLENEVINYLENE); POLY(VINYLCYCLOHEXANE)

Citation

MACROMOLECULAR CHEMISTRY AND PHYSICS, v.213, no.19, pp.2027 - 2033

ISSN
1022-1352
DOI
10.1002/macp.201200294
URI
http://hdl.handle.net/10203/207380
Appears in Collection
CBE-Journal Papers(저널논문)
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