Abstract
We report results on adsorbed layers of polystyrene (PS)-polyethylene oxide (PEO) diblock and PEO-PS-PEO triblock copolymers at the solid/liquid interface. The volume fraction profiles of the adsorbed PS-PEO diblock copolymers at the the quartz/toluene interface determined by neutron reflectometry are consistent with a parabolic profile as predicted by theory. Ellipsometry was used to investigate the adsorption kinetics of PS-PEO diblock copolymer chains on SiO2 from toluene. The results show a rapid diffusion-controlled process, characterized by a linear increase in the adsorbed amount with the square-root of time, at the early stages of adsorption, while at late times adsorption is slow and appears to be governed by an exponential time behavior. Studies of the PEO-PS-PEO copolymer, using the surface-force apparatus, reveal conformational rearrangements for the adsorbed triblock chains between mica surfaces. When two such surfaces are in close proximity to each other, triblock chains originally adsorbed in a “loop” conformation may open into a “bridge” conformation with both PEO blocks of a given chain adsorbing onto opposing mice surfaces. This is indicated by the appearance of clearly detectable attractive forces and their evolution with compression-decompression cycles. The time evolution of these forces reflects the dynamics of the rearrangement of chains between the two surfaces.
Preview
Unable to display preview. Download preview PDF.
References
Taunton HJ, Toprakcioglu C, Fetters LJ, Klein J (1990) Macromolecules 23:571–580; (1988) Nature 332:712–714
Taunton HJ, Toprakcioglu C, Klein J (1988) Macromolecules 21:3333–3336
Guzonas D, Boils D, Hair ML (1991) Macromolecules 24:3383–3387
Motschmann H, Stamm M, Toprakcioglu C (1991) Macromolecules 24:3681–3688
Field JB, Toprakcioglu C, Ball RC, Stanley HB, Dai L, Barford W, Penfold J, Smith G, Hamilton W, Macromolecules, in press
Dai L, Toprakcioglu C (1991) Europhys Lett 16:331–335
Milner ST, Witten TA, Cates MF (1988) Europhys Lett 5:413–418; (1988) Macromolecules 21:2610–2619
Luckham PF, Klein J (1985) Macromolecules 18:721–728
Author information
Authors and Affiliations
Editor information
Rights and permissions
Copyright information
© 1993 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG
About this chapter
Cite this chapter
TOprakcioglu, C., Dai, L., Ansarifar, M.A., Stamm, M., Motschmann, H. (1993). Equilibrium and dynamic aspects of end-attached diblock and triblock copolymer chains. In: Ewen, B., Fischer, E.W., Fytas, G. (eds) Application of Scattering Methods to the Dynamics of Polymer Systems. Progress in Colloid & Polymer Science, vol 91. Steinkopff. https://doi.org/10.1007/BFb0116464
Download citation
DOI: https://doi.org/10.1007/BFb0116464
Received:
Accepted:
Published:
Publisher Name: Steinkopff
Print ISBN: 978-3-7985-0952-8
Online ISBN: 978-3-7985-1678-6
eBook Packages: Springer Book Archive