Abstract
Abstract Organometallic compounds such as aluminum trialkyl (AIR3) and lithium alkyl react nonradically with ethylene-vinyl acetate copolymers (EVA) to yield very high crosslinking rates. The mechanism is characterized by simultaneous reactions: addition, reduction, and enolization accompanied with ethene and ethane elimination. The crosslinking reaction is exclusively due to enolization and subsequent dimerization. Systems containing anisole, ether, or quinoline together with AIEt3 were investigated. It is shown that only free AIR3 is able to crosslink EVA. The reaction mechanisms were proved experimentally. The process allows the production of polymers exhibiting improved mechanical properties. The polar groups formed during the reaction, and the metal content, improve the ability of the modified polymers to combine with polar polymers. This leads to an increase in adhesiveness to inorganic surfaces compared to radically crosslinked EVA.
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