Authors Grundke, K. ; Zschoche, St. ; Pöschel, K. ; Gietzelt, Th. ; Michel, S. ; Friedel, P. ; Jehnichen, D. ; Neumann, A.W.
Title Wettability of Maleimide Copolymer Films: Effect of the Chain Length of n-Alkyl Side Groups on the Solid Surface Tension
Date 09.10.2001
Number 9619
Abstract We report bulk and surface properties of maleimide copolymers with two different backbones,poly(propene-<I>alt</I>-<I>N</I>-(<I>n</I>-alkyl)maleimides) (PAlkMI) and poly(styrene-<I>alt</I>-<I>N</I>-(<I>n</I>-alkyl) maleimides) (SAlkMI),with different lengths of <I>n</I>-alkyl side chains (methyl, ethyl, propyl, butyl, pentyl, hexyl, octyl, and dodecyl).The contact angle and solid surface tension results suggest that, for the longer side chains, the surfaceproperties are dominated by the side chains. Indeed, the surface tension of the two types of copolymerswith length of the side chain above <I>C</I> = 6 are essentially equal, indicating complete shielding of the polarbackbone chain. For the two copolymers containing dodecyl side chains, the solid surface tension is similarto that of solid surfaces consisting exclusively of CH<SUB>3</SUB> groups. Apparently, these side groups are longenough to allow arrangement in the configuration of the lowest surface free energy possible for alkylchains. For the short side chain copolymers the styrene compounds are more hydrophobic than the propenecompounds. The bulkier phenyl rings shields the polar backbone chain more effectively than the smallalkyl groups.
Publisher Macromolecules
Citation Macromolecules 34 (2001) 6768-6775
Tags PG_Wetting_ContactAngle

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