||Adsorption dynamics of hydrophobically modified polymers at an air-water interface
Trégouët, Corentin ,
Salez, Thomas ,
Pantoustier, Nadège ,
Perrin, Patrick ,
Reyssat, MathildeMonteux, Cécile
p.1706 , 2017-06-21 , Cornell University Library
The adsorption dynamics of a series of hydrophobically modified polymers, PAAαCn, at the air-water interface is studied by measuring the dynamic surface tension. The PAAαCn are composed of a poly(acrylic acid) backbone grafted with a percentage α of C8 or C12 alkyl moieties, at pH conditions where the PAA backbone is not charged. The observed adsorption dynamics is very slow and follows a logarithmic behavior at long times indicating the building of an energy barrier which grows over time. After comparison of our experimental results to models from the literature, a new model which accounts for both the deformation of the incoming polymer coils as well as the deformation of the adsorbed pseudo-brush is described. This model enables to fit very well the experimental data. The two fitting parameters give expected values for the monomer size and for the area per adsorbed polymer chain.