Surface and interfacial FTIR spectroscopic studies of latexes. XI. The effect of Sty/n-BA copolymer composition on the orientation of SDOSS surfactant molecules

✍ Scribed by B.-J. Niu; Marek W. Urban

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 543 KB
• Volume: 60
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960418)60:3<371::aid-app10>3.0.co;2-6

✦ Synopsis

These studies examine how various latex copolymer compositions, ranging from 100% n-BA to 50%/50% Styln-BA, may influence sodium dioctylsulfosuccinate (SDOSS) mobility, diffusion, and orientation near the film-air (F-A) and film-substrate (F-S) interfaces. Polarized attenuated total reflection Fourier transform infrared spectroscopy is utilized to examine the surfactant behavior in Styln-BA latexes at the F-A and F-S interfaces. Based on the analysis developed for the purpose of these studies, the highest concentration of SDOSS is detected near the F-A interface for 50%/50% Styln-BA compositions. However, when the content of styrene in Styln-BA copolymer is diminished, the highest content of SDOSS is detected near the F-S interface. This behavior is particularly evident for 100% poly(n-BA) latexes. When SDOSS molecules are near the F-A and F-S interfaces, the SO,Na+ hydrophilic ends are preferentially parallel to the surface, whereas hydrophobic tails are perpendicular.