Ionic nanocomposite networks in poly(styrene‐co‐methacrylic acid) copolymers with calcium carbonate |
| |
| Authors: | Celine Chevallier Yiping Ni Ruben Vera Frederic Becquart Mohamed Taha |
| |
| Affiliation: | 1. Université de Lyon, F‐42023, Saint‐Etienne, France;2. CNRS, UMR 5223, Ingénierie des Matériaux Polymères, F‐42023, Saint‐Etienne, France;3. Université de Saint‐Etienne, Jean Monnet, F‐42023, Saint‐Etienne, France;4. Université Lyon I, Centre de diffractométrie Henri Longchambon, 43 boulevard du 11 novembre 1918, 69622, Villeurbanne, France |
| |
| Abstract: | To create reversible supramolecular ionic networks, ionic cross‐links were formed from acid pendant functions in poly(styrene‐co‐methacrylic acid) copolymers by the addition of calcium carbonate. The random dispersion of acid functions in the polystyrene chain is ensured by NMR analysis. The partial reaction of the calcium carbonate with the carboxylic acids is highlighted by a limewater test. The influence of methacrylic acid and calcium‐carbonate contents on the formation of an ionic network has been studied through solubility tests. Two main effects were obtained: the exfoliation of the unreacted calcium carbonate characterized by TEM is due to ionic interactions at the surface of nanometric particles that form the first level of organization of the calcium carbonate. Another part of the calcium carbonate reacts with carboxylic acid and is detached from particles to form clusters as shown by x‐ray analysis. Finally, by analyzing the dynamic rheological spectrum, the conclusion that the strength of the ionic bonds arises with the calcium content is made. The interest of such an approach with a wide range of observed phenomena in the material is a one‐batch process to make thermoreversible nanocomposite networks. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 |
| |
| Keywords: | supramolecular structures nanostructured polymers synthesis and processing cross‐linking structure– property relations |
|
|
