18299-85-9Relevant articles and documents
Surface segregation in polymer blends driven by surface freezing
Prasad, Shishir,Hanne, Laurie,Dhinojwala, All
, p. 7467 - 7470 (2006)
The surface freezing-driven surface segregation in polymer blends was investigated by determining the surface composition and surface temperatures in binary mixtures containing two different lengths of side chains. The chemical attachment of alkyl chains to the backbone was found to lead to considerable differences from the surface freezing in binary alkane mixtures. The surface transition and composition were measured using surface-sensitive infrared-visible sum frequency generation (SFG) spectroscopy and surface tension. The SFG spectra at various blend concentrations were measured as a function of temperature to determine the orientation and concentration of the ordered chains on the surface. The results show that the surface segregation of V22 is sufficient to cover the surface with C22 below Ts22.