Structure and Properties of Interpolymer Complexes Based on Sodium Carboxymethylcellulose Polysaccharide and Carbopol

Abstract

In this paper, the structure and properties of interpolymer complexes (IPC) based on sodium carboxymethylcellulose with a linear carbopol were studied. Interpolymer complexes were obtained by mixing aqueous solutions of Na-CMC and carbopol components in various ratios of components and pH of the medium. The structure of the obtained products was determined using the methods of IR spectroscopy and X–ray diffraction analysis. IR spectra in the range of 400-4000 cm-1 were recorded on spectrophotometers "NIKOLET Magna-560 IR" and "Specord–75 IR" (Karl Zeiss, GDR). X-ray diffraction analysis of IPС films was carried out on a Rigaku X-Ray installation with an X-ray generator with a rotating copper anode, at a voltage of 40 kV, with a current strength of 15 mA and using characteristic Cu-Ka radiation in the area of angles 0 <2θ <40. IR spectroscopic data show that the interpolymer complexes based on Na-CMC and carbopol obtained in moderately acidic regions are stabilized due to the cooperative hydrogen bond between the carboxyl groups of Na-CMC and the carbonyl groups of carbopol. X-ray diffraction analysis has shown that a change in the composition of the interpolymer complex leads to a change in the structure, which depends on the structure and nature of the interchain bonds. It is ascertained that an increase in the number of hydrogen bonds leads to a more ordered state of the resulting interpolymer complex. It is revealed that the formation of an interpolymer complex due to hydrogen bonds provides additional stability. This can serve as one of the means of controlling the structure and properties of the IPC of sodium carboxymethylcellulose with carbopol.

Keywords

• sodium carboxymethylcellulose
• carbopol
• polycomplex
• interpolymer complex
• films
• structure
• properties
• ir spectroscopy introduction
• x-ray diffraction analysis
• hydrogen bond