Synthesis and characterization of organogel from poly(acrylic acid) with cellulose acetate

Abstract

Abstract:In the last decade, the interest in physical organogels has grown rapidly with the discovery and synthesis of a very large number of diverse molecules, which used organic solvents at low concentrations. New organogels based on poly (acrylic acid) (PAA) and cellulose acetate (CA) were prepared as thin films to study properties and swelling behavior. In organogels synthesis different crosslinking agent and initiator concentrations were studied. The swelling for PAA/CA organogels was carried out with acetone at 3 different temperatures (30º, 40º and 50 ºC) and pH of 6.5 (pH acetone = 6.5). The higher swelling for PAA/CA organogels was 770% for 25PAA/75CA composition ratio with 3%wt N,N´-methylene-bis acrylamide (MBA) and 1%wt potassium persulphate (KPS) at 30 °C. The films were analyzed by FTIR and the presence of functional groups of each polymer was confirmed without secondary reactions. The DSC analysis indicated two glass transition temperatures (T g ); at 106 ºC corresponding to PAA and 86 ºC, corresponding to CA, respectively, indicative of phase separation, characteristic of gels. Surface morphology was analyzed by Scanning electron microscopy (SEM) showing smooth surface and small crystal forms.

EFFECT OF TEMPERATURE AND pH ON THE ABSORPTION OF METHYLCELLULOSE HYDROGEL

“…The method of Rivas et al (2010), in a batch type glass reactor with a capacity of 500 ml, 10 g of MC and distilled water were added until a 2% by weight solution and mixed for 1 hour maintaining constant stirring and controlled temperature at 60°C, subsequently, 4 ml of glutaraldehyde was added as a crosslinking agent and 4 ml of acid hydrochloric acid as a catalyst for the synthesis reaction, and was kept under constant stirring at 60°C for a period of 2 hour reaction.…”