Highly Heat-Resistant Materials for Microelectronics: Hydrodynamic, Optical, and Conformational Properties of Fluorine Containing Poly(Amido-ortho-Hydroxy Amide)

Abstract

The polycondensation of the mixture of diamines 5,5-methylene bis(2-aminophenol) and 4,4-(hexafluoroisopropylidene)dianiline (molar ratio 0.8:0.2) with isophthaloyl dichloride was used to synthesize poly(amido-o-hydroxy amide) (POA-F) - new heat resistant binder of the composites for microelectronics. The copolymer was fractionated, its hydrodynamic, optical, and conformational properties were researched, and molecular masses (ММ) of the fractions were defined. The polydispersity index was estimated. Based on experimental data, calculation of the size of a segment of Kuhn characterizing degree of an intramolecular orientation order and value of coefficients of the equation of Mark-Kuhn-Hauvink for viscometric and diffusion data were performed. It was demonstrated that introducing 20 mol % of the monomer with -CF3-groups does not lead to any changes in conformational properties of the macromolecules and does not change the degree of intramolecular orientational order (the Kuhn segment length). Optical characteristics of POA-F solutions are virtually similar to the corresponding values for POA prepared with the use of single amine-containing component-5,5-methylene bis(2-aminophenol). The received MM distribution for POA-F (prepolymer) provided the solubility of its films in alkaline solutions. The heat resistance (τ5 and τ10-temperatures corresponding to 5% and of 10% PBO-F mass loss of a polymer) of the powders and the films of PBO, PBO-F were determined. The electrophysical parameters-dielectric permittivity (ε) and dielectric loss tangent (tan δ) of the PBO-F films decreased down to 3.30 and 0.017, in comparison 3.40 and 0.025 for PBO respectively.

Keywords

poly(o-hydroxy amide) 4,4-(hexafluoroisopropylidene) dianiline / Kuhn segment / Mark-Kuhn-Houwink equations / translational diffusion / intrinsic viscosity / flow birefringence