Origins and Effects of a Surfactant Excess near the Surface of Waterborne Acrylic Pressure-Sensitive Adhesives
| Autor: | J.-P. Gorce, Joseph L. Keddie, Peter J. McDonald, J. Mallégol, Chris Jeynes, O. Dupont |
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| Rok vydání: | 2002 |
| Předmět: |
chemistry.chemical_classification
Materials science Atomic force microscopy Surfaces and Interfaces Polymer Water concentration Condensed Matter Physics symbols.namesake Gibbs isotherm Pulmonary surfactant chemistry Chemical engineering Pressure sensitive Polymer chemistry Electrochemistry symbols General Materials Science Adhesive Spectroscopy |
| Zdroj: | Langmuir. 18:4478-4487 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la0117698 |
| Popis: | An excess of anionic surfactant at the surface of waterborne acrylic pressure-sensitive adhesives (PSAs) is identified through the complementary use of atomic force microscopy and elemental depth profiling with Rutherford backscattering spectroscopy. This surfactant is distributed around the particles at the film surface, where it presumably contributes to the stabilization of the particles against coalescence. This result is not consistent with the prediction of a process model of film formation that a coalesced skin layer should form, owing to the polymer's low zero-shear-rate viscosity (5 × 104 Pa s). To investigate the reason for the surface excess, the spatial distribution of water during film formation of the latex PSAs has been determined using magnetic resonance profiling. In the later stages of drying, the water concentration is very low near the surface, and it increases linearly with the depth into the film. The water profiles indicate that the deformation of particles is not accompanied by coa... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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