Comparative study of acoustic non-linearity parameter in binary mixtures of N,N-dimethylacetamide with Polyethylene Glycols at different temperatures

•B/A parameter is deduced for DMA with PEG 200/PEG 400 using seven methods.•The excess values of B/A have been computed and fitted with Redlich-Kister equation.•Molecular properties have been calculated by Beyer-Tong Dong method using Sehgal’s relations.•Beyer-Tong Dong method is found to be most suitable to elucidate molecular interactions in the present study. The present paper deals with the comparative evaluation of acoustic non-linearity parameter (B/A) for binary liquid mixtures of N, N-dimethylacetamide (DMA) with Polyethylene Glycol 200 (PEG 200) and Polyethylene Glycol 400 (PEG 400) using seven different approaches as Beyer, Hartmann, Ballou, H. Endo, Lu, Tong-Dong and Beyer-Tong Dong at temperatures 308.15, 318.15 and 328.15 K. The excess values of B/A have been computed using all seven approaches and substituted into the Redlich-Kister equation. The temperature and pressure derivatives of ultrasonic velocity using Beyer and Beyer- Tong Dong methods have been presented for both the mixtures. Molecular properties have also been calculated by Beyer-Tong Dong method using Sehgal’s relations. The aim of the present investigation is to check the validity and efficacy of different methods on the dimethylacetamide-Polyethylene Glycol mixtures and to get the better understanding about the nature and strength of the intermolecular interactions in the mixtures.