Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/99609
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.
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Rights: aberto
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Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0042625525&partnerID=40&md5=bfbcf1e7c0c619e2042e56dde6439ba6
Date Issue: 1992
Appears in Collections:Unicamp - Artigos e Outros Documentos

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