PMMA/Zinc Oxide Nanocomposites Prepared by In-Situ Bulk Polymerization

✍ Scribed by Mustafa M. Demir; Mine Memesa; Patrice Castignolles; Gerhard Wegner

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 206 KB
• Volume: 27
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.200500870

✦ Synopsis

Abstract

Summary: Dispersing surface‐modified zinc oxide nanoparticles (ZnO) in methyl methacrylate (MMA) improves the free radical bulk polymerization process as well as the thermal stability of the formed polymer. Hydroxy groups available on the ZnO surface may induce a degenerative transfer. This suppresses the gel effect, which leads to a better control of the heat evolution during the late stages of polymerization. The formation of chains having vinylidene end groups and head‐to‐head links is suppressed, which shifts the onset of thermal decomposition to the regime where decomposition occurs by random chain scission.

Thermal degradation profiles of PMMA and its composite with ZnO at 11 wt.‐%.

magnified imageThermal degradation profiles of PMMA and its composite with ZnO at 11 wt.‐%.