The Formulation of Polymers by Polymerization–Polycondensation Processes: Polyimide Based Systems

Abstract

Radical chain (co)polymerization of a set of acrylates containing dissolved high performance polymers, namely fluoropolyimide, is performed. Based on the study of the structure and properties of the polymers (elemental composition, solubility, molecular weight parameters, etc) it is proposed that the copolymer formation reaction takes place due to a transfer chain reaction on the polyimide. The influence of acrylate (ethyl-, n-butyl-, methyl-α-fluoro-, ethylα-fluoro-, methyl-glycidyl-, butyl-, hexafluoro-iso-propylmethacrylate) and polyimide content on the properties of the copolymers obtained is studied. Clear and opaque, hard and elastic materials are obtained. These polymers differ in their characteristics from the relevant polyacrylates and their blends with polyimide prepared by the usual method of mixing. One-step catalytic polycondensation of diamines and tetracarboxylic acid dianhydrides in a solution of preformed polyimide is studied. It is shown that such a procedure influences the structure and properties of polyimides formed in situ.

New Polyheteroarylene Based Copolymers Formulation

“…Previously [1,2], it was stated that the formulation of new polymers by addition polymerization in the presence of cited aromatic polymers became possible due to the high solubility of some cardo copolyimides in definite unsaturated monomers including (meth)acrylates. Different results obtained during the study of the properties of the polymers formed suggested the formation of graft copolymers [2]. It is important to clarify the reasons for new polyacrylatepolyimide polymers by preparing such a polymerization process.…”

“…corresponding to data cited. The model compound, namely, bis-(N-phenyl imide) of dianhydride 6F, was prepared according to [2].…”

“…The free radical polymerization of MMA was performed by gradually increasing the temperature from room temperature to 100 • C. The total reaction time was 50-60 h. The polymerization of MMA in the presence of polyimide, polyarylate, poly(arylene ether ether ketone) based on bisphenol 6F and poly(arylene phthalide) was performed in bulk, where as cyclohexanone (33-50 wt% based on MMA) was used as an inert diluent upon polymerization of MMA in the presence of polyamide and poly(arylene ether ether ketone) based on phenol phthalein. The detailed procedure of this process was recently presented in [1,2].…”

“…It was said that by radical polymerization of acrylates containing dissolved polyimides, novel copolymers could be formed. The properties of polymers prepared from polyimide and many (meth)acrylates involving various fluoroacrylates are presented in [2]. The excellent solubility of a set of fluorinated cardo copolyimides, for example, represented by structure 1, is a prerequisite of their successful application in such a process.…”

“…In our previous work [1,2] based on the excellent solubility of some aromatic polyimides in various organic solvents (including some unsaturated monomers), new copolymers have been derived by free radical polymerization of (meth)acrylates containing the cited polymers. Such polymers differ by improved heat resistance, solubility and tensile properties in comparison with the corresponding plain poly(meth)acrylates and their blends with polyimides obtained via solution in common solvents.…”