Abstract

ROGEL-HERNANDEZ, Eduardo; LICEA-CLAVERIE, Angel; CORNEJO-BRAVO, José Manuel  and  ARNDT, Karl-Friedrich. Preparación de hidrogeles anfifílicos sensibles a diferentes valores de pH utilizando monómeros ácidos con espaciadores hidrofóbicos. Rev. Soc. Quím. Méx [online]. 2003, vol.47, n.3, pp.251-257. ISSN 0583-7693.

In this work the synthesis of amphiphilic hydrogels is reported, based on methacrylic acid derivatives with hydrophobic spacers of aliphatic type (1, 3, 5, 9 and 10 methylene units). The prepared hydrogels show critical pH values for deswelling-swelling transition in accordance with the aliphatic spacer: the longer the aliphatic spacer the higher the critical pH. The critical pH corresponds well with the pK_a shifts expected as effect from the aliphatic spacer when the number of methylene units goes from 1 to 5. However, when the number of methylene units is 9 and 10, the observed critical pH is higher than that expected from the aliphatic spacer influence. Additional hydrophobic interactions could be responsible for the observed behavior.

Keywords : Hydrogels; sensitive polymers; methacrylates; pH-sensitive; amphiphilic.

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