Surface Segregation Driven by Molecular Architecture Asymmetry in Polymer Blends
Jae Sik Lee, Nam-Heui Lee, Somesh Peri, Mark D. Foster, Charles Majkrzak, Renfeng Hu, David T. Wu
The contributions of chain ends and branch points to surface segregation of long-branched chains in blends with linear chains have been studied using Neutron Reflectometry and Surface-Enhanced Raman Spectroscopy for a series of novel, well-defined polystyrenes. A linear response theory accounting for the number and type of branch points and chain ends is consistent with surface excesses and composition profile decay lenghts, and allows the first determination of branch point potentials. Surface excess is determined primarily by chain ends with branch points playing a secondary role.
polymers, surface segregation, neutron reflectometry, thin film structure, polymer blends
, Lee, N.
, Peri, S.
, Foster, M.
, Majkrzak, C.
, Hu, R.
and Wu, D.
Surface Segregation Driven by Molecular Architecture Asymmetry in Polymer Blends, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=917143
(Accessed December 7, 2023)