Accession Number : ADA216007

Title :   The Size of the Alkyl Group R is the Principal Factor Determining the Wettability of Surface-Functionalized Polyethylenes (PE-CONHR and PE-CO2R) by Water.

Descriptive Note : Interim rept.,

Corporate Author : HARVARD UNIV CAMBRIDGE MASS DEPT OF CHEMISTRY

Personal Author(s) : Wilson, Mark D. ; Ferguson, Gregory S. ; Whitesides, George M.

Report Date : NOV 1989

Pagination or Media Count : 16

Abstract : Advancing contact angles Theta (a) were measured for a series of surface-functionalized polyethylene films bearing ester (-CO2C(n)H(2n+1))and amide (-CONH(n)H(2n+1)) groups having different sizes of alkyl group. The influence of the polar ester or amide functionality on Theta (a) is no longer detectable for alkyl groups having n >or= 6. The size of the alkyl group required to shield a polar functional group at the surface of the polymer from the contacting water inferred from these experiments is remarkable similar to that observed previously with the more highly ordered, self-assembled monolayers of omega-mercapto ethers (HS(CH2)16OC(n)H(2n+1)) on gold. (aw)

Descriptors :   *ALKYL RADICALS, *POLYETHYLENE, *WETTING, ANGLES, ESTERS, GOLD, POLARITY, SIZES(DIMENSIONS), WATER, AMIDES, POLYMERIC FILMS, SURFACES.

Subject Categories : Polymer Chemistry
      Physical Chemistry
      Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE