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Title: Structural characteristics and gas permeation properties of polynorbornenes with retained bicyclic structure
Authors: Zhao, Chun-tian 
Ribeiro, M. do Rosário 
Pinho, M. N. de 
Subrahmanyam, V. S. 
Gil, C. L. 
Lima, A. P. de 
Keywords: Polynorbornene; Gas permeation; Membrane
Issue Date: 2001
Citation: Polymer. 42:6 (2001) 2455-2462
Abstract: Polynorbornenes of different molecular weights were synthesised by addition polymerisation, using a nickel based catalyst. This polymerisation route leads to amorphous polymers that were shown to display unique properties: high glass transition temperature, rigid random coil conformation, and dense packing in the amorphous state. Gas permeation membranes were prepared from these addition type non-substituted polynorbornenes. A study of their gas transport properties was performed and compared with both substituted addition polynorbornenes and ring opening metathesis polymerised polynorbornenes. The observed behaviour, in terms of permeability and selectivity, is in accordance with the low free volume and the dense packing confirmed by positron annihilation spectroscopy and WAXD in these polymer structures.
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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