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Investigation of modified bitumen binders via Fourier-transform infrared spectroscopy

https://doi.org/10.32362/2410-6593-2020-15-2-56-66

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Abstract

Objectives. This study evaluates the effect of the modification process on the group composition of bitumen and bitumen binders containing rubber powder and hybrid modifier that is based on styrene–butadiene thermoplastic elastomer and rubber crumb. The aim of the study was to determine the presence or absence of functional groups that reflect the direction of physicochemical processes during the preparation of a hybrid modifier in rotary dispersers and during the modification of bitumen binders.

Methods. Rubber powder and hybrid modifier were obtained by high-temperature shear grinding using a rotary disperser. Bitumen and modified bitumen binders were investigated via Fouriertransform infrared spectroscopy. Using the method of spectral subtraction, it was determined that during the process of manufacturing modified bitumen binders, structural changes occur in both bitumen and modifiers. During this study, the extraction of modifiers (rubber powder and hybrid modifier) in toluene was performed.

Results. The quantitative analysis of changes in the group composition of modifiers before and after the modification procedure was carried out. The active polymer and structural indices were determined. The general trend of the change in the active polymer and structural indices was noted for the initial spectra of the rubber powder and hybrid modifier, and their spectra were obtained after the procedure of subtraction from the spectra of bitumen binders.

Conclusions. The interdiffusion of aromatic compounds between the bitumen component and modifier particles was confirmed. On the basis of the results of the extraction of modifiers in toluene, and by taking into account the infrared spectroscopy data, it was determined that during the production of hybrid modifier during the simultaneous grinding of rubber crumb and styrene– butadiene thermoplastic elastomer, there was a chemical interaction between them. 

About the Authors

I. V. Gordeeva
N.N. Semenov Federal Research Center of Chemical Physics, Russian Academy of Sciences
Russian Federation

Irina V. Gordeeva, Junior Research Assistant

4, ul. Kosygina, Moscow, 119991



D. A. Melnikov
Research Institute of Elastomeric Materials and Products
Russian Federation

Dmitry A. Melnikov, Engineer

2, b. 1, Perovskii proezd, Moscow, 111024



V. N. Gorbatovа
N.N. Semenov Federal Research Center of Chemical Physics, Russian Academy of Sciences
Russian Federation

Victoria N. Gorbatova, Engineer

4, ul. Kosygina, Moscow, 119991



D. S. Reznichenko
Research Institute of Elastomeric Materials and Products; MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Dmitry S. Reznichenko, Cand. of Sci., General Director;  Senior Teacher, B.A. Dogadkin Department of Material Physics and Chemistry

2, b. 1, Perovskii proezd, Moscow, 111024; 1, b. 5, Malaya Pirogovskaya ul., Moscow, 119435



Yu. A. Naumova
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Yulia A. Naumova, Dr. of Sci. (Chemistry), Professor, Department of  Chemistry and Processing Technology of Elastomers

1, b. 5, Malaya Pirogovskaya ul., Moscow, 119435



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Supplementary files

1. Determination of peaks for calculating the active polymer index using the hybrid bituminous binder as an example.
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2. This is to certify that the paper titled Investigation of modified bitumen binders via Fourier-transform infrared spectroscopy commissioned to Enago by Irina V. Gordeeva, Dmitry A. Melnikov, Victoria N. Gorbatovа, Dmitry S. Reznichenko, Yulia A. Naumova has been edited for English language and spelling by Enago, an editing brand of Crimson Interactive Inc.
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Using the method involving subtraction of IR spectra, it was found that during the manufacture of modified bituminous binders, structural changes occurred in both bitumen and modifiers. A quantitative analysis of the changes in the group composition of the modifiers before and after the modification procedure was performed. The active polymer and structural indices were determined. Notably, a general trend in changing the structural indices for the initial spectra of the rubber powder and hybrid modifier and for the spectra obtained after the procedure of subtracting the spectrum of bitumen binders from the spectrum of bitumen binders was observed. The occurrence of interactions between aromatic molecules in the bituminous component and modifier particles was confirmed.

For citation:


Gordeeva I.V., Melnikov D.A., Gorbatovа V.N., Reznichenko D.S., Naumova Yu.A. Investigation of modified bitumen binders via Fourier-transform infrared spectroscopy. Fine Chemical Technologies. 2020;15(2):56-66. https://doi.org/10.32362/2410-6593-2020-15-2-56-66

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