Views: 44 Author: Site Editor Publish Time: 2022-07-14 Origin: Site
Although the VAc group inherent in EVA makes it a polar elastomer, the compatibility of EVA with polar polymers and inorganic fillers remains to be improved. By grafting reactions to EVA by polar or non-polar monomers, more groups can be introduced into the EVA molecular chain, improving EVA performance as a compatibilizer for polyolefin with other polar polymers or inorganic fillers.
The grafted monomers can be divided into polar functional monomers and non-polar functional monomers. Polar grafting monomers include carboxylic acids or their esters, carboxylic acid anhydrides, etc., such as maleic anhydride (MAH), acrylic acid (AA), and methyl methacrylate (MMA). In addition to grafting polar monomers to polyolefin molecular chains to improve its polarity and realize its functionalization, non-polar monomers such as styrene can also be grafted to polyolefin molecular chains to improve its properties.
Melt grafting is a common method for EVA grafting, especially when the grafting monomer is maleic anhydride, and the molten polymer, grafting monomer and initiator are added to the screw extruder or banbury mixer under heating conditions. The melting reaction is suitable not only for polar monomers, but also for non-polar monomers, such as styrene.
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