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Structural characteristics and gas permeation properties of polynorbornenes wit...
Zhao, Chun-tian; Ribeiro, M. do Rosário; Pinho, M. N. de; Subrahmanyam, V. S.; Gil, C. L.; Lima, A. P. dePolynorbornenes 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 po...
Effect of water-soluble electron scavengers on positronium formation in AOT/wat...
Subrahmanyam, V. S.; Marques, M. F. Ferreira; Duplâtre, G.In a previous work reporting on positron annihilation lifetime spectroscopy (LS) measurements in AOT/water/isooctane microemulsions, a model was established leading to the satisfactory description of both triplet positronium (o-Ps) formation and decay. The model proposes that a large proportion of Ps is formed in the aqueous pseudophase, a fraction of which can diffuse out to the organic phase. It thus predicts...
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