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Type: Artigo de periódico
Title: Configuration Of Grafted Polystyrene Chains In The Melt: Temperature And Concentration Dependence
Author: Zhao X.
Zhao W.
Zheng X.
Rafailovich M.H.
Sokolov J.
Schwarz S.A.
Pudensi M.A.A.
Russell T.P.
Kumar S.K.
Fetters L.J.
Abstract: The concentration profiles of carboxy-terminated polystyrene chains in the melt grafted onto oxide-covered silicon substrates were measured using secondary-ion mass spectroscopy. The grafting density increased with temperature and an enthalpy of +7.4 kcal/mole was deduced for the grafting reaction, SiOH + R(COOH) ⇄ R(COOSi) + H2O. Relatively high grafting densities (σ∼6.6·mg/m2) were achieved with minimal chain distortion or displacement of long chains by shorter ones. Significant stretching of the grafted chains occurred for σ > 10 mg/m2. An equilibrium constant for the grafting reaction incorporating entropy is discussed.
Rights: aberto
Identifier DOI: 
Date Issue: 1992
Appears in Collections:Unicamp - Artigos e Outros Documentos

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