Abstract
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, 5GHz; 2.75, 10GHz), and a relatively high glass transition temperature (260°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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