Effect of polyoxyethylene emulsifier composition on the course of emulsion polymerization of vinyl acetate

✍ Scribed by Ayoub, Magdy M. H.; Nasr, H. E.; Rozik, N. N.

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 280 KB
• Volume: 44
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199712)44:4<413::aid-pi817>3.0.co;2-x

✦ Synopsis

Three di †erent emulsiÐer types from vinyl acetate monomer and methoxypolyoxyethylene (35 : 65, 27 : 73 and 19 : 81 wt : wt%) were prepared in the presence of benzoyl peroxide using a macroradical initiator technique. Fourier transform infrared spectroscopy and 1H nuclear magnetic resonance were carried out to conÐrm the structure of the copolymers obtained (emulsiÐers). The emulsion polymerization of vinyl acetate initiated by sodium persulphate as an initiator in the presence of non-ionic (polyoxyethylene (POE) type) emulsiÐer has been kinetically investigated. The rate of polymerization was found to be proportional to the 0É33, 0É40 and 0É44 power of the emulsiÐer concentration and to the 0É71, 0É79 and 0É87 power of the initiator concentration. The apparent activation energy was found to be 135, 56É5 and 38 kJ mol~1 for 65 wt%, 73 wt% and 81 wt% POE, respectively. The particle size was observed to increase with increasing initiator concentration and to decrease with increasing emulsiÐer concentration. The reaction order with respect to the emulsiÐer concentration (number of particles versus emulsiÐer concentration) was found to be 0É10, 2É05 and 0É89 for 65 wt%, 73 wt% and 81 wt% POE, respectively.