Synthesis and properties of halogen containing simple and complex block copolyethers

Bifunctional halogen-containing oligomers of various composition and structure were synthesized. Simple and complex aromatic block copolyethers of constructional and film purpose were obtained by various methods of polycondensation. Physical and chemical properties of obtained block copolyethers were studied.

Polyesters on the basis of petroleum resin and polyethylene glycols

New polyesters have been obtained on the basis of C9 petroleum resin with carboxyl groups and polyethylene glycols. The average molecular mass of the petroleum resin is 1050, its functionality = 1.74. Optimal for the polyesters synthesis is the equimolar ratio between the initial compounds. The reaction is performed in the melt in the presence of p-toluenosulphuric acid as the catalyst. In the optimal temperature range 150 - 190oC the yield of the process ranges from 91 to 94 % depending on the conditions.

Synthesis of peroxy oligomers using 1,2-epoxy-3-tert-butyl peroxypropane

The possibility of peroxy oligomer synthesis has been studied by three methods: telomerization of diepoxy derivatives of ethylene glycol or Bisphenol A using 1,2-epoxy-3-tert-butyl peroxypropane as telogen, modification of phenol-formaldehyde resins by 1,2-epoxy-3-tert-butyl peroxypropane and polycondensation of phenol containing –O–O– bonds with formaldehyde. The peroxy oligomers obtaining conditions have been established and 7 new oligomers with peroxy groups have been synthesized. The structures of synthesized oligomers have been verified by chemical and spectral methods.

Photoelectron Properties and Paramagnetism of Polyimides Based on N,N,N’,N’-substituted p-Phenilenediamine and Dianhydrides

The photoelectric characteristics and paramagnetic properties of newly synthesized polyimides (PI) have been investigated using the electrophotographic method and an ESR signal study. The polyimides based on N,N,N',N'-substituted p-phenylenediamine and dianhydrides, were prepared via polycondensation. The polymers exhibit excellent solubility in common organic solvents, and have high thermal stability. The PI films exhibit photoelectric sensitivity in the UV, and visible spectral regions. The mechanism of photogeneration has been investigated.