Physicochemical Characteristic of Polydiacetylene Prepared in Vesicles, Rod-like and Thin Film upon Gamma Rays

Syazwani Mohd Faizo; Naurah Mat Isa; Roshafima Rasit Ali; Nur Fathin Amirah Shafie; Zatil Izzah Ahmad Tarmizi

Authors

Syazwani Mohd Faizo Radiation Processing Division, Malaysian Nuclear Agency, 43400 Bangi, Selangor, Malaysia
Naurah Mat Isa Radiation Processing Division, Malaysian Nuclear Agency, 43400 Bangi, Selangor, Malaysia
Roshafima Rasit Ali Department of Chemical and Environmental Engineering, Malaysia–Japan International Institute of Technology, Universiti Teknologi Malaysia, 54100 Kuala Lumpur, Malaysia
Nur Fathin Amirah Shafie Radiation Processing Division, Malaysian Nuclear Agency, 43400 Bangi, Selangor, Malaysia
Zatil Izzah Ahmad Tarmizi Department of Chemical and Environmental Engineering, Malaysia–Japan International Institute of Technology, Universiti Teknologi Malaysia, 54100 Kuala Lumpur, Malaysia

Keywords:

Polydiacetylenes vesicles, supramolecular assemblies, physicochemical changes, gamma radiation

Abstract

The purpose of this research was to look into the physicochemical properties of polydiacetylene (PDA) supramolecular assemblies made from 10,12-pentacosadiynoic acid after gamma irradiation. PDA can be oriented into any supramolecular form, including vesicle, rod-like and thin film structures. PDA dispersion was exposed to gamma radiation ranging from 0.5 - 5kGy. Pentacosa-10,12-diynoic acid is a diacetylene conjugate material with radiochromic properties. Its structure contains a pi-conjugated electron that efficiently reacts against radiation, transforming its optical properties in the visible region. The prepared PDA was characterised using UV-vis, FESEM, AFM, ¹H NMR and FTIR. The colour intensity of the PDA before and after gamma irradiation was measured and observed. The spectra were detected by UV-vis analysis at 649 nm. FESEM analysis revealed the morphology of vesicles as irregular shape particles and rod-like formations, whereas AFM analysis revealed the surface roughness of the formed PDA film. FTIR and ¹H NMR analysis confirmed the chemical structure of the PDA prepared in this study. As a result, the characteristics of each PDA supramolecule conformation and their response to gamma radiation were compared.