COPOLYMERIZATION OF BUTADIENE-1,3 AND STYRENE IN THE PRESENCE OF INITIATORS BASED ON AMINO DERIVATIVES OF VINYLBENZYL CHLORIDE

Abstract

The kinetic regularities of the process of copolymerization of 1,3-butadiene (B) and styrene (S) in a hydrocarbon solvent at a temperature of 35–65 °C in the presence of modified initiators based on amino derivatives of S and an electron donor additive ditetrahydrofurfurylpropane (DTHFP) have been studied. Modified initiators based on N,N-diethylaminomethylstyrene (DEAMSLi) and N,N-diisopropylaminomethylstyrene (DIPAMSLi) have been synthesized. Their characteristics were studding by the following methods: IR-spectroscopy of incomplete internal reflection with Fourier spectrometer Varian Excalibur HE 3600 (Varian Inc, USA); gel-permeated chromatograph Agilent 1200 (Agilent Technologies, USA); differential scanning calorimetry (DSC) on a DSC 204 F1 Phoenix instrument (NETZCH, Germany). It was found that when an electron-donor additive is introduced into the system, the rate of the process increases by a factor of 3–5, and the reactivity of S also increases for both initiating system, DEAMSLi-DTHFP and DIPAMSLi-DTHFP. The constants of copolymerization of B with S were calculated by two methods (Kehlen and Tydesh; Fineman and Ross), which confirm the kinetic calculations. It was confirmed that the developed initiating system based on the amino derivatives of S and the electron-donor additive DTHFP makes it possible to obtain styrene-butadiene rubbers with the required molecular weight and microstructure characteristics.