ma501934p_si_001.pdf (2.25 MB)
Sonochemical Transformation of Epoxy–Amine Thermoset into Soluble and Reusable Polymers
journal contribution
posted on 2015-01-27, 00:00 authored by Yuqin Min, Shuyun Huang, Yuxiang Wang, Zhijun Zhang, Binyang Du, Xinghong Zhang, Zhiqiang FanThe
degradation and reuse of epoxy thermosets have significant impact
on the environments. We report that an epoxy–amine thermoset
embedded with Diels–Alder (DA) bonds was transformed into soluble
polymers via sonochemistry under mild temperature (ca. 20 °C)
for the first time. Sonication could effectively induce the position-oriented
cleavage of DA bonds (i.e., retro-DA) of the fully swelled epoxy thermoset
in dimethyl sulfoxide (DMSO), leading to the soluble polymers. Of
importance, such sonochemical process could be regulated on demand
via switching on-and-off of the sonication. The obtained soluble polymers
could be recured to form epoxy–amine thermosets via DA reaction.
This sonochemical method might provide an unprecedented and efficient
way to the controlled degradation and recycling of the epoxy thermosets
containing the dynamic covalent bonds likes DA groups.