Adsorption and structure formation of the weak polyelectrolytic diblock copolymer, PVP-b-PDMAEMA View Full Text


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Article Info

DATE

2002-06

AUTHORS

Boris Mahltig, Jean-François Gohy, Sayed Antoun, Robert Jérôme, Manfred Stamm

ABSTRACT

This paper reports on the pH-dependent adsorption of weak the polyelectrolytic diblock copolymer poly(2-vinylpyridine)-block-poly(dimethylaminoethyl methacrylate), (PVP-b-PDMAEMA). Aqueous PVP-b-PDMAEMA solutions have been adsorbed on alkaline pretreated silicon substrates. Altogether two copolymers differing in block ratio and molecular weight were used for the investigations. While the electrical charge of both samples in solution was investigated by electrophoretic measurements, the adsorbed polymer layers were studied with ellipsometry and atomic force microscopy (AFM). Depending on pH the electrical charge of both blocks of the diblock copolymer varied. Three different regimes have been identified. Under acidic conditions at pH<5, both blocks are mainly positively charged. At medium pH between 5 and 8, only the PDMAEMA block is positively charged. At pH>8, both blocks are nearly uncharged and a polymer precipitation occurred in solution. Each of these pH regimes was characterized by a specific adsorption behaviour leading to two adsorption maxima at acidic and alkaline pH values, while at medium pH a plateau in the adsorbed amount was observed. Moreover, the structures of the polyelectrolytes formed on the substrate after adsorption were specific to each of the three pH regimes. More... »

PAGES

495-502

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00396-001-0628-1

DOI

http://dx.doi.org/10.1007/s00396-001-0628-1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1043942538


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