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Title: Viscometric characterization of PS/POSS hybrid nanocomposites [Caracterização viscosimétrica de nanocompósitos híbridos PS/POSS]
Authors: Bianchi, O
Repenning, G.B
Mauler, R.S
Oliveira, R.V.B 
Canto, L.B
Keywords: Degree of conversion
Dicumyl peroxide
End-to-end distances
Higher weight
Hybrid nanocomposites
Mass fraction
Molecular size
Polydispersity indices
Polyhedral oligomeric silsesquioxanes
Polymer-solvent interactions
Reactive melts
Root Mean Square
Transfer agents
Gel permeation chromatography
Refractive index
Viscosity measurement
Issue Date: 2012
Citation: Bianchi, O, Repenning, G.B, Mauler, R.S, Oliveira, R.V.B, Canto, L.B (2012). Viscometric characterization of PS/POSS hybrid nanocomposites [Caracterização viscosimétrica de nanocompósitos híbridos PS/POSS]. Polimeros 22 (2) : 125-133. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Polystyrene (PS) and polyhedral oligomeric silsesquioxanes (POSS) hybrid nanocomposites with different compositions were obtained by reactive melt processing using dicumyl peroxide (DCP) as initiator in the presence or absence of styrene as radical transfer agent. The materials were characterized by viscosimetry by means of gel permeation chromatography (GPC) using triple-detector: light scattering, viscometer and refractive index. PS/POSS samples processed with styrene showed higher weight average molecular weights (M w) and lower polydispersity indexes (M w/M n), as a result of higher PS-POSS conversion (28-40%) and lower PS degradation, as compared to the PS/POSS samples processed without styrene in which the degree of conversion was lower (24-28%). For the PS/POSS solutions in THF, the parameters of the Mark-Houwink-Sakurada equation, ? ? 0.7 and log K ? -3.5 to -3.9, and the values of polymer-solvent interaction parameter, ? ij ? 0.49, were not changed with respect to changes in molecular size. On the other hand, these changes were characterized by a cumulative function of the mass fraction of chains as a function of the root mean square end to end distance (<r> 1/2).
Source Title: Polimeros
ISSN: 0104-1428
DOI: 10.1590/S0104-14282012005000022
Rights: Attribution 4.0 International
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