Some observations on the magnetic field effect on photoinitiated emulsion polymerization of styrene

✍ Scribed by Md. Nazimuddin; A.R. Das; B.M. Mandal; S.N. Bhattacharyya

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 378 KB
• Volume: 26
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(90)90154-v

✦ Synopsis

The photo-emulsion polymerization of styrene using benzoin or dibenzyl ketone as photoinitiator, with or without magnetic field, has been followed with time. The magnetic field effect is best seen at low rates of radical generation. The field shortens the particle nucleation period to a small extent so that the polymerization in the absence of the field is delayed by that small time. At the lowest light intensity (lowest radical generation rate) used in this work, the steady state Rp increases by 80% with the application of a field of 1000 G. The field effect on molecular weight is discernible only at low conversions. Molecular weights increase greatly with conversion both with and without the field so that the field effect, if any, on molecular weights in the later stages of reaction is masked.