Synthesis of renewable and self-curable thermosetting hyperbranched polymers
Epoxy resins are used widely in industry due to their excellent performance. However, the disposal of the cured epoxy resins and their composites has become an increasingly environmental problem due to the inability to recycle. Scientists have prepared a series of renewable and self-curable thermosetting epoxy-ended hyperbranched polymers (DSEHP-n, n=3, 5, 7 and 11) by a reaction between glycidol and isocyanate-ended hyperbranched polymers (IHP-n). The IHP-n were synthesised by a click reaction between 2,2′,2″- (1,3,5-hexahydro-s-triazine-1,3, 5-triyl) benzyl mercaptan and toluene-2,4-diisocyanate.
High adhesive strength and strong pencil hardness
The self-cured DSEHP-n films showed high adhesion strength (Class 1) and very strong pencil hardness (6H). It is interesting that the self-cured films could be degraded completely in comfortable condition into some renewable monomers. The paper supplies a rapid and efficient approach to synthesise renewable thermosetting hyperbranched polymers, and it will give positive effect on recycle and reuse of cured epoxy resins and composites.
The study is published in: Progress in Organic Coatings Volume 134, September 2019, Pages 189-196.
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