Infrared visible sum frequency generation (SFG) spectroscopy has been used to study structure and melting transition temperatures of alkyl-side chain-acrylate comb polymers at air and solid interfaces. At the air interface, the SFG spectra show methyl bands and two transitions are observed: the first, near the bulk melting temperature, T-m, and the second 10-20degreesC higher than T-m. The shorter the alkyl side chain, the larger the difference between the two transition temperatures. In contrast, methylene bands are observed at sapphire interface with a single transition near T-m (C18).
Physical Review Letters
Required Publisher's Statement
Copyright 2002 American Physical Society. The original published version of this article may be found at http://dx.doi.org/10.1103/PhysRevLett.88.145501.
Gautam, K. S. and Dhinojwala, Ali, "Melting at Alkyl Side Chain Comb Polymer Interfaces" (2002). College of Polymer Science and Polymer Engineering. 23.