Abstract
The structure and properties of products arising from the reaction of orthoboric acid with m-phenylene-bismaleimide in melt at 200°C have been studied by spectral and physicochemical methods. The data of IR spectroscopy and thermomechanical analysis suggest that, under the chosen conditions, chemical interaction between the reagents occurs. The conversion increases with the time of reaction and the content of m-phenylene-bismaleimide. High-temperature plasticizers, such as diphenyl and triphenylphosphate, unexpectedly favor formation of more rigid polymer structures, whereas a “temporary plasticizer” (decamethylene glycol) hinders interaction between orthoboric acid and m-phenylene-bismaleimide. The temperature corresponding to a 20% weight loss of the polymer synthesized during heating in air at orthoboric acid: m-phenylene-bismaleimide = 80: 20 is 440–445°C, and the carbon-containing fragments are present in the pyrolysate up to 800°C. The polymer samples retain their shape in air for long time and in water vapor for several days. The hydrolytic stability of the products increases with the content of m-phenylene-bismaleimide.
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