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- W2040274123 abstract "Thiol-terminated oligosulfides undergo crosslinking under mild conditions with bismaleimides in the presence of catalytic amounts of triethylamine in polar solvents. The mechanism of crosslinking is thought to be the formation of the thiolate anion which adds to the olefinic group on the maleimide to give a carbanion species which then undergoes further addition reactions. To illustrate this possibility, an ABA block copolymer consisting of oligosulfide (B) and maleimide (A) blocks was prepared by reaction between the oligosulfide and a maleimide in the presence of triethylamine. Reaction between dithiothreitol and a bismaleimide under similar conditions does not result in a crosslinked product and this is attributed to the interaction of hydroxyl groups with any carbanion species formed. Crosslinking was observed in the reaction between an oligosulfide and hexane bismaleate although much more slowly than for bismaleimide. Reactions between dithiothreitol and a bis(acetylene ketone), and an oligosulfide and a bis(acetylene ketone), both resulted in linear polymers of moderate molar mass." @default.
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- W2040274123 date "1995-07-01" @default.
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- W2040274123 title "Chain extension and crosslinking of telechelic oligomers—II. Michael additions of bisthiols to bismaleimides, bismaleates and bis(acetylene ketone)s to give linear and crosslinked polymers" @default.
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- W2040274123 doi "https://doi.org/10.1016/0014-3057(95)00006-2" @default.
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