Journal
REACTIVE & FUNCTIONAL POLYMERS
Volume 122, Issue -, Pages 158-166Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.reactfunctpolym.2017.12.001
Keywords
Main-chain benzoxazine; Reaction solvent; Dielectric property; Synthesis; Polymerization kinetics
Funding
- SRF for ROCS, State Education Ministry, PR China [SEM036]
- Hubei Provincial Department of Education [XD2010037]
- grant of the Opening Project of the State Key Laboratory of Polymer Materials Engineering (Sichuan University) [KF201106]
- Engineering Research Center of Nano-Geomaterials of Ministry of Education [CUG2015]
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Novel aromatic main-chain benzoxazine copolymer oligomers are synthesized by the Mannich reaction. Cured main-chain benzoxazine copolymers possess improved processing and high-frequency dielectric properties in comparison with corresponding main-chain benzoxazines, owing to the decreased molecular polarity and molecular weight. It should be noted that the polar/nonpolar heterogeneous solvent indeed plays a key role in the preparation of main-chain copolymer oligomers. The copolymers prepared in the optimized heterogeneous solvent condition has the least activation energy, the minimum high-frequency dielectric constants (2.81, 5 GHz; 2.75,10 GHz), and a relatively high glass transition temperature (260 degrees C). Therefore, this work not only provides a simple path for improving processing and high-frequency dielectric properties of main-chain benzocaine but also gives some insight into the effects of solvent on the formation of copolymers.
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