Benzoxazine functionalized polyphenyl ether resin prepolymer, thermosetting resin and preparation methods of benzoxazine functionalized polyphenyl ether resin prepolymer and thermosetting resin

The invention relates to a benzoxazine functionalized polyphenyl ether resin prepolymer, thermosetting resin and a preparation method of the benzoxazine functionalized polyphenyl ether resin prepolymer. Starting from commercial high-molecular-weight polyphenyl ether resin, the polyphenyl ether resin prepolymer functionalized by monofunctional benzoxazine, bifunctional benzoxazine and terminated main chain benzoxazine can be prepared from redistributed polyphenyl ether resin only through one-step chemical reaction, and the preparation process is simple, low in cost and easy to industrialize. The benzoxazine functionalized polyphenyl ether thermosetting resin obtained through thermocuring of the prepolymer has excellent thermal performance, dielectric performance and solvent resistance, especially has excellent ultrahigh-frequency dielectric performance, and can be applied to the fields of high-frequency and high-speed circuit board substrates, microwave and millimeter wave communication, vehicle-mounted radars