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| - Assessment of Spatial Order in Dried Latexes by Small-Angle X-rayScattering
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| Abstract
| - The spatial order present in a dried latex consisting of poly(styrene) (PS) particles(diameter: 106 nm) is investigated by small-angle X-ray scattering (SAXS). The process of drying isconducted below the glass transition temperature of PS to avoid deformation of the particles when goingfrom the concentrated latex to a system of close-contact particles. The assessment of spatial order restson the analysis of the structure factor S(q) (q = (4π/λ) sin(θ/2); θ = scattering angle; λ = wavelength) ofthe dry latex. S(q) has been obtained by SAXS measurements of the particles in the dilute latex and inthe dried system. Special attention is paid to the different contrast between the particles and thesurrounding medium when going from the waterborne latex particles to the dry film. It is demonstratedthat the system under consideration here exhibits no true long-range order but a more liquidlike shortrange order. The data show furthermore that the deformation of the particles during the process ofdrying must be small if not negligible.
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