ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Exploring the physical properties of polyhydroxybutyrate via eccentricity-based topological indices

Usman Babar, Asim Naseem, Hani Shaker, and Muhammad Kamran Siddiqui

Department of Mathematics, Government College University, Lahore, Pakistan

E-mail: usmanbabar762@yahoo.com

Received: 21 April 2025  Accepted: 25 May 2025

Abstract:

The biopolymers known as polyhydroxyalkanoates (PHA’s) are composed of a variety of microorganisms that are responsible for their preparation and composition. These naturally occurring polymers possess certain physical characteristics that are identical to those of plastics derived from petroleum, such as polypropylene. Based on this information, it can be deduced that these natural polymers possess the capability of functioning as an alternative to plastics that are generated from petroleum. Polyhydroxybutyrate (PHB), polyhydroxyvalerate, and their copolymer (PHBV) are the PHA’s that are found in the greatest abundance in a variety of microorganisms from across the world. In this research, we have made a chemical structure model of PHB and determined its eccentricity tables and also calculated eccentricity-based TI’s. For PHB, the computation of eccentricity-based TI’s provides important information about its structural characteristics and possible uses. Additionally, the application of TI’s may improve polymer performance prediction models, directing the future development of more sustainable and effective materials.

Keywords: Eccentricity; Polyhydroxyalkanoates (PHA’s); Polyhydroxybutyrate (PHB); TI (Topological index); \(\zeta\); avec (Average eccentricity); GA\(_{4}\) (Geometric arithmetic eccentricity); ABC\(_{5}\) (Atom; Eccentricity version of Zagreb indices; Primary 05C0

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-025-04153-x

Chemical Papers 79 (9) 5785–5798 (2025)