The
new main-chain benzoxazine copolymer oligomers with bulky hydrocarbon
end groups are first designed and synthesized. In particular, the
aliphatic diamine based copolymers owning low dielectric constants
(<3) and ultralow dielectric losses (<0.005) under high frequencies,
is suitable for applications in the field of high-frequency communications.
Therefore, this work not only provides a facile and effective protocol
to simultaneously obtain excellent high-frequency dielectric properties,
and improved processing and thermal properties of benzoxazine resins,
but also widens the scope of the design and synthesis of functional
and high-performance thermosetting polymers.
The effects of the reaction solvent on the preparation, polymerization kinetics, and high-frequency dielectric properties of aliphatic main-chain benzoxazine copolymers were investigated.
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