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Five-hundred milliliters of tetrahydrofuran (THF) and 1.0 g CaH2 were added into a clean round-bottom flask and stirred for 24 h. Distillation was conducted in air-free environment to obtain dried THF. The n-hexane was dried with the same method as THF. Five-hundred milliliters of DMF and 100 mL toluene were mixed and the trace water in DMF was removed by azeotropic distillation under a N2 atmosphere. After cooling to 25 °C, the dried DMF was used for polymerization.
Copyright and License information: ©2018 by the authors.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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