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Latex Fractionation by Sedimentation and Colloidal Crystallization: The Case of Poly(styrene-co-acrylamide)

✍ Scribed by Érico Teixeira-Neto; Carlos Alberto Paula Leite; André Herzog Cardoso; Maria do Carmo Vasconcelos Medeiros da Silva; Melissa Braga; Fernando Galembeck

Book ID
102969342
Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
958 KB
Volume
231
Category
Article
ISSN
0021-9797

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✦ Synopsis

Poly(styrene-co-acrylamide) (PS-AAM) latex was prepared, fractionated by sedimentation under gravity, and characterized by PCS, infrared spectra, secondary and backscattered electron imaging in the scanning electron microscope, and electron spectroscopy imaging in an analytical transmission electron microscope. Three latex fractions were obtained. The lower fraction was opalescent and its particles were the more uniform, concerning size, chemical composition, and topochemical features. This lower fraction was still further fractionated by zonal centrifugation in a density gradient, yielding two fractions with similar macrocrystalforming abilities but different sizes and chemical compositions. These results confirm those previously obtained for the PS-HEMA latex.

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## Abstract The miscibility of poly(2‐hydroxyethyl methacrylate)/poly(styrene‐__co__‐acrylamide) (PHEMA/PSAm) blends was investigated by nonradiative energy transfer fluorescence spectroscopy using anthracene‐labeled PHEMA and carbazole‐labeled PSAm. The results show that the ratio of the carbazole