Fabrication of block copolymer monolayers by adsorption from supercritical fluids: a versatile concept for modification and functionalization of polymer surfaces.

Fabrication of block copolymer monolayers by adsorption from supercritical fluids: a versatile concept for modification and functionalization of polymer surfaces. Research Abstract Details 

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Fabrication of block copolymer monolayers by adsorption from supercritical fluids: a versatile concept for modification and functionalization of polymer surfaces. Abstract Text:

We describe a generic method for polymer surface modification and functionalization that is applicable for substrates of arbitrary shape. The method involves the deposition of monolayer and submonolayer films of photoactive block copolymers from supercritical fluids. Poly(styrene- b- tert-butyl acrylate), poly(S- b- tBA), block copolymer monolayers form spontaneously on polystyrene substrates by adsorption from scCO 2 when hexane is used as a cosolvent. Atomic force microscopy indicates the films are flat and without pores after modification. Ethylene glycol contact angles increase linearly with deposition pressure until a constant value, equal to that of pure P tBA, is attained at pressures of 18 MPa or greater at 40 degrees C. This trend mimics the change in block copolymer solubility with pressure and indicates that the block copolymer self-assembles and orders at the surface, presenting a P tBA layer at the air interface with the PS block orienting toward the PS substrate. The P tBA layer thickness, determined by angle dependent X-ray photoelectron spectroscopy, reaches a saturated monolayer value of ca. 2 nm for pressures of 18 MPa and higher, consistent with the thickness expected for unperturbed P tBA chains comprising a wet brush. This concept for polymer surface modification initially produces a hydrophobic surface due to surface adsorption of the low surface tension P tBA block, but can also be used to prepare hydrophilic, functional surfaces, either modified or patterned with carboxylic acid groups, by photolytic or acid catalyzed deprotection/hydrolysis of the tert-butyl ester groups.

Fabrication of block copolymer monolayers by adsorption from supercritical fluids: a versatile concept for modification and functionalization of polymer surfaces. Publishing Authors By Initials

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Fabrication of block copolymer monolayers by adsorption from supercritical fluids: a versatile concept for modification and functionalization of polymer surfaces. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Langmuir : the ACS journal of surfaces and colloid

VOLUME: 24

Page Numbers: 10488-93

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ISSN: 0743-7463

DAY: 12

MONTH: 08

YEAR: 2008

Fabrication of block copolymer monolayers by adsorption from supercritical fluids: a versatile concept for modification and functionalization of polymer surfaces. Information

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LANGUAGE: eng

NlmUniqueID: 9882736

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Country: United States

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MEDLINETA: Langmuir

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