This is the result of an ongoing collaboration with Dr. N. Sommerdijk’s Biomaterials group at the University of Eindhoven (the Netherlands) and illustrates the close collaboration that exists in pursuing the design and application of novel polymeric materials between the two groups. This details work on a physical phenomenon (selective delamination) and key materials (amphiphilic block copolymers) that have subsequently been applied in the design of novel biomaterials. These results have appeared in a larger body of work including Advanced Materials, Angewandtie Chemie International Edition and the Journal of Materials Chemistry

Durand, Geraldine G

Holder, Simon J.

Leclere, P.E.L.G.

Popescu, Daniela C.

Rossi, Nicholas A. A.

Sommerdijk, Nico A. J. M.

Thune, P.

Wouters, D.

Yeoh, Chert-Tsun

English

Kent Academic Repository

A more detailed description of the synthesis and characterisation of the individual polystyrene based copolymers will be given in a forthcoming publication.

Colloid Interface Sci.

copolymers with the hydrophilic:hydrophobic weight ratio (r ) 2Mn PMAA block/Mn PMMA block) in the range 0.2-1.4 were kindly provided by

For an overview of the studies of blends of block copolymers, see: Hamley,

Nature (London)

Science

Some of the films (e.g., 4a, 4f) peeled from freshly evaporated Cu (ı

The Physics of Block Copolymers;

Surface induced selective delamination of amphiphilic ABA block copolymer thin films

We demonstrate the unforeseen property of selective adhesion/delamination of amphiphilic block copolymer films in coating hydrophobic and hydrophilic substrates. When spin-coated from THF solutions onto hydrophilic substrates (e.g., glass and O3-treated silicon wafer), amphiphilic poly(oligoethylene glycol methyl ether methacrylate) (POEGMA)-based ABA block copolymers 1 and 2 formed thin films with hydrophobic surfaces. Upon exposure to water, these films undergo a fast rearrangement to a hydrophilic surface before they delaminate from the substrate. In contrast, when deposited on a hydrophobic substrate (e.g., Au, Si, Ag), the same copolymer films do not undergo any surface rearrangement and remain as coherent thin films on the substrate. From contact angle measurements it becomes clear that the delamination is accompanied by a rapid surface rearrangement from a hydrophobic to hydrophilic nature. This rearrangement is not observed for the copolymer over hydrophobic surfaces despite the identical constitutions of the copolymers and identical microphase-separated surface morphologies. It is shown that within the range of polymers investigated this behavior was only observed for POEGMA-containing triblock copolymers. Moreover, it is also shown that in order to show this delamination behavior the polar A-block must be large compared to the apolar B-block. On the basis of XPS and AFM data, we propose that this selective adhesion/delamination is a direct consequence of the self-organization of the block copolymers in the polymer thin films

Popescu, D.C.

Rossi, N.A.A.

Yeoh, C.T.

Durand, G.G.

Leclère, P.E.L.G.

Thuene, P.C.

Holder, S.J.

Sommerdijk, N.A.J.M.

NARCIS 

Surface-induced selective delamination of amphiphilic ABA block copolymer thin films

Pure OAI Repository

Daniela C. Popescu

Nicholas A. A. Rossi

Chert-Tsun Yeoh

Geraldine G. Durand

Daan Wouters

Philippe E. L. G. Leclère

Peter Thüne

Simon J. Holder

Nico A. J. M. Sommerdijk

Crossref

Surface-Induced Selective Delamination of Amphiphilic ABA Block Copolymer Thin Films

http://kar.kent.ac.uk/878/1/Delaminating_Thin_Films_MACROMOLECULES_2004.pdf

Surface induced selective delamination of amphiphilic ABA block copolymer thin films

Abstract

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Kent Academic Repository

NARCIS

Pure OAI Repository

Pure OAI Repository

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