Reactive processing of polymers:melt grafting of glycidyl methacrylate on ethylene propylene copolymer in the presence of a coagent

Al-Malaika, Sahar and Kong, Wei (2001). Reactive processing of polymers:melt grafting of glycidyl methacrylate on ethylene propylene copolymer in the presence of a coagent. Journal of Applied Polymer Science, 79 (8), pp. 1401-1415.

Abstract

Glycidyl methacrylate (GMA) was grafted on ethylene-propylene copolymer during melt processing with peroxide initiation in the presence and absence of a more reactive comonomer (coagent), trimethylolpropane triacrylate (Tris). The characteristics of the grafting systems in terms of the grafting reaction yield and the nature and extent of the competing side reactions were examined. The homopolymers of GMA (Poly-GMA) and Tris (Poly-Tris) and the GMA-Tris copolymer (GMA-co-Tris) were synthesized and characterized. In the absence of the coagent, high levels of poly-GMA, which constituted the major competing reaction, was formed, giving rise to low GMA grafting levels. Further, this grafting system resulted in a high extent of gel formation and polymer crosslinking due to the high levels of peroxide needed to achieve optimum GMA grafting and a consequent large drop in the melt index (increased viscosity) of the polymer. In the presence of the coagent, however, the grafting system required much lower peroxide concentration, by almost an order of magnitude, to achieve the optimum grafting yield. The coagent-containing GMA-grafting system has also resulted in a drastic reduction in the extent of all competing reactions, and in particular, the GMA homopolymerization, leading to improved GMA grafting efficiency with no detectable gel or crosslinking. The mechanisms of the grafting reactions, in the presence and absence of Tris, are proposed.

Publication DOI: https://doi.org/10.1002/1097-4628(20010222)79:8<1401::AID-APP70>3.0.CO;2-4
Divisions: Engineering & Applied Sciences > Chemical engineering & applied chemistry
?? 13770100JJ ??
Additional Information: Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.
Uncontrolled Keywords: reactive processing ,grafting of GMA,reactions on EP copolymer,goagent for grafting
Published Date: 2001-02-22

Download

Full text not available from this repository.

Export / Share Citation


Statistics

Additional statistics for this record