"Fatal adsorption" of brushlike macromolecules: high sensitivity of C-C bond cleavage rates to substrate surface energy.
Adsorption-induced degradation of brushlike macromolecules was monitored through molecular imaging by atomic force microscopy. The rate constant for C-C bond cleavage was shown to be extremely sensitive to the substrate surface energy. A few percent increase in the surface energy from 69.2 to 71.2 mN/m led to an order of magnitude increase of the scission rate. The absolute values of the rupture forces ranging from 2.57 to 2.47 nN are in agreement with previously calculated and measured values for stretching surface-tethered molecules.
Lebedeva
Natalia V
NV
Caudill Laboratories, Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, USA.
Sun
Frank C
FC
Lee
Hyung-Il
HI
Matyjaszewski
Krzysztof
K
Sheiko
Sergei S
SS