Three-Dimensional Compositional Gradients in Water-Borne Urethanes and Latexes: Spectroscopic Approaches

Document Type

Article

Publication Date

12-1-2000

Department

Polymers and High Performance Materials

Abstract

Stratification of individual components in thermosetting coatings plays an important role during film formation and affects a number of macroscopic properties. This behavior is particularly pronounced for water-borne coatings, and therefore molecular level understanding of interactions in latexes and responsiveness of individual components during coalescence of water-borne polyurethanes are of particular interest. The presence of macromolecular arrangements and interactions among various components near the film-air (F-A) and the film-substrate (F-S) interfaces can be effectively monitored using attenuated total reflectance (ATR) and step-scan photoacoustic (SSPA) Fourier transform infrared (FT-IR) spectroscopy. Both approaches are capable of obtaining information from various surface depths and complement each other if one seeks molecular level information from 0 to 150 mum into the film. In this presentation combined ATR and PA information along with IR and/or Raman surface imaging will be presented to establish three-dimensional representation of polyurethane film formation and the effect of copolymer/polymer blend latexes on coalescence processes in Sty/n-BA. (C) 2000 Published by Elsevier Science S.A.

Publication Title

Progress in Organic Coatings

Volume

40

Issue

1-4

First Page

195

Last Page

202

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