ИСТИНА

The invention relates to a organosilicon fragment-​modified phthalonitrile monomer I, where X is a divalent arom. radical selected from substituted benzene derivs., and Y is silicone fragment selected from a group comprising -​SiR1R2 and SiR1R2-​O-​SiR1R2, where R1 and R2 - radicals selected from a group comprising CH3, C6H5, and HC=CH2. The invention also relates to a method of producing organosilicon fragment-​modified phthalonitrile monomer, comprising: obtaining hydroxyl-​comprising phthalonitrile; and reacting hydroxyl-​comprising phthalonitrile with dichlorosilane in an anhyd. protic solvent in the presence of base, followed by extn. of obtained monomer. The invention also claims a binder comprising inventive monomer and arom. diamine as polymn. initiator. A prepreg comprising inventive binder and reinforcing material is also claimed