The inverse emulsion polymerization of acrylamide with pentaerythritolmyristate as emulsifier. 1. Experimental studies

✍ Scribed by Pross, Alexander; Platkowski, Kristina; Reichert, Karl-Heinz

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 299 KB
• Volume: 45
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199801)45:1<22::aid-oi905>3.0.co;2-2

✦ Synopsis

The inverse emulsion polymerization of aqueous acrylamide solutions in isooctane as dispersing media with the emulsiÐer pentaerythritolmyristate and an oil-soluble azo initiator was studied, particularly with respect to the inÑuence of the chemically pure emulsiÐer. In this free radical polymerization, a water-inoil emulsion with droplet sizes around 10 lm is converted into a latex with average particle diameters between 80 and 200 nm containing a polymer with molar masses up to 16 ] 106 g mol~1 Kinetic data were measured by adiabatic as well as by isothermal calorimetry. The inÑuences of various parameters on polymerization kinetics, particle numbers and molar mass averages were studied. Experimental results show a positive inÑuence of the emulsiÐer concentration on the reaction rate and indicate the dominance of a bimolecular termination reaction with respect to the polymer radicals above a certain initiator concentration.

1998 SCI.