Abstract
Copolymers based on 4,4′-dihydroxydiphenyl, phenolphthalein and 4,4′-dichlorodiphenyl sulfone were synthesized by the method of high temperature polycondensation. The structure of the synthesized copolymers was confirmed by IR spectroscopy. Their physical, mechanical and thermal properties were investigated. It is shown that increases in the content of carded fragments lead to higher glass transition temperatures and heat resistance of the copolymers, as well as higher elastic and strength properties.
Highlights
Aromatic polysulfones are of great interest for various industries due to their particular set of valuable properties, such as heat resistance, fire resistance, high strength, etc. [1]
In work [25], we reported on preliminary studies of the synthesis of cardo polyphenylene sulfones, with a content of 4,4-dihydroxyphthalophenone up to 50%
PPSU was synthesized according to Scheme 1; a copolymer of polyphenylene sulfone with 4,4 dioxyphthalophenone was synthesized according to Scheme 2
Summary
Aromatic polysulfones are of great interest for various industries due to their particular set of valuable properties, such as heat resistance, fire resistance, high strength, etc. [1]. The first mention in the patent literature of the synthesis of polysulfones based on 4,4 dioxyphthalophenone and 4,4 -dichlorodiphenylsulfone dates back to 1969 [3]; attention was mainly paid to the specific influence of cardo fragments on the properties of the polymer. Studies have been carried out [7] on the effect of cardo groups on the dielectric properties of polyetherimides (PEI) These PEI-based films are characterized by good dielectric properties, with an ultra-low dielectric constant of 2.3 at 1 MHz, due to an increase in the free volume in the polymer chain. These materials are used as functional materials for the microelectronic, aerospace, electrical insulating and semiconductor industries. This article presents the results of a study of the whole series of copolymers of cardo polyphenylene sulfones synthesized by us in order to establish the dependence of the properties of the copolymer on the content of 4,4-dihydroxyphthalophenone
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