Growth and structure of surface-initiated poly(n-alkylnorbornene) films.

Growth and structure of surface-initiated poly(n-alkylnorbornene) films. Research Abstract Details 

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Growth and structure of surface-initiated poly(n-alkylnorbornene) films. Abstract Text:

Brad J Berron,Evan P Graybill,G Kane Jennings,Brad J Berron,Evan P Graybill,G Kane Jennings,

We report the surface-initiated growth of poly(alkylnorbornene) films via ring-opening metathesis polymerization (ROMP). The films are grown by exposure of a vinyl-terminated self-assembled monolayer (SAM) on gold to Grubbs first-generation catalyst and the subsequent exposure to an alkylnorbornene monomer. We investigate the influence of alkyl side chains on the structure, barrier, surface properties, and the growth kinetics of surface-initiated ROMP-type poly(norbornene) films. Rate constants for film growth are estimated for the comparison of monomer reactivity. The rate constant for film growth decreases by 3 orders of magnitude from norbornene to decylnorbornene, indicating a strong effect of chain length on initiation and/or propagation rates. Reflectance-absorption infrared spectroscopy is used to show the molecular level packing within the poly(alkylnorbornene) films is disrupted by the alkyl side chains. Tapping-mode atomic force microscopy is used to show that norbornene, butylnorbornene, and hexylnorbornene polymerize from the surface to form dense coatings, whereas decylnorbornene polymerizes to form isolated polymer clusters. The methyl terminus of the alkyl side chains increases the hydrophobicity of the poly(alkylnorbornene) films (thetaA(H2O) = 109-114 degrees) beyond that of a typical poly(norbornene) film (thetaA(H2O) approximately 106 degrees). The additional hydrophobicity throughout the film correlates with superior resistances against redox probes (Rf approximately 105 Omega.cm2) for poly(hexylnorbornene) when compared to polynorbornene (Rf approximately 104 Omega.cm2). The resistance of the poly(decylnorbornene) film (Rf approximately 102 Omega.cm2) is consistent with its nonuniform, cluster-like morphology.

Growth and structure of surface-initiated poly(n-alkylnorbornene) films. Publishing Authors By Initials

BJ Berron,EP Graybill,GK Jennings,BJ Berron,EP Graybill,GK Jennings,

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Growth and structure of surface-initiated poly(n-alkylnorbornene) films. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Langmuir : the ACS journal of surfaces and colloid

VOLUME: 23

Page Numbers: 11651-5

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ISSN: 0743-7463

DAY: 11

MONTH: 10

YEAR: 2007

Growth and structure of surface-initiated poly(n-alkylnorbornene) films. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Growth and structure of surface-initiated poly(n-alkylnorbornene) films.

AFFILIATION: Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235, USA.

Country: United States

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MEDLINETA: Langmuir

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