The structure of low conversion polymers of ethylene dimethacrylate

✍ Scribed by H. Galina; K. Dušek; Z. Tuzar; M. Bohdanecky; J. Štokr

• Book ID: 103074156
• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 330 KB
• Volume: 16
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(80)90221-9

✦ Synopsis

Results of study of the pregel chain polymerization of ethylene dimethacrylate in the presence of various amounts of diluent suggest the formation of compact microgel-like particles even at the very beginning of polymerization, as a consequence of predominant cyclization. This view is based on following experimental findings. The fraction of units with pendant vinyls (70 mol ~o) is independent of conversion and depends only slightly on dilution; critical conversion at gelation is displaced by a factor of about 102; molecular weights at the beginning correspond approximately to molecular weights of poly(methyl methacrylate) obtained under the same conditions; intrinsic viscosities are very low and much lower than those of strongly branched poly(methyl methacrylates).