Title

Polystyrene/Poly(n-butyl acrylate) Latex Blend Coalescence, Particle Size Effect, and Surfactant Stratification: A Spectroscopic Study

Document Type

Article

Publication Date

10-3-2000

Department

Polymers and High Performance Materials

Abstract

These studies show that polystyrene/poly(n-butyl acrylate) (p-Sty/p-nBA) latex blend coalescence is inherently affected by latex composition, p-Sty particle size, and the temperature difference between coalescence (T-c) and glass transition (T-g) temperatures. Sodium dioctylsulfosuccinate (SDOSS) surfactant molecules are expelled to the film-air (F-A) interface when T-c > T-g of the p-Sty phase. Quantitative attenuated total reflectance Fourier transform infrared (ATR FT-IR) analysis shows that SDOSS-H2O concentration levels near the F-A interface diminish for larger p-Sty latex particle sizes and the magnitude of the SDOSS-COOH interactions near the F-A interface exhibits similar trends. Furthermore, the amount of SDOSS expelled to the F-A interface is directly proportional to the p-Sty phase surface area. These studies also show that SDOSS hydrophilic ends are preferentially parallel to the F-A interface, while hydrophobic ends are preferentially perpendicular.

Publication Title

Macromolecules

Volume

33

Issue

20

First Page

7573

Last Page

7581