ELECTRON IRRADIATED EFFECT IN POLYURETHANES STUDIED BY POSITRON ANNIHILATION LIFETIME SPECTROSCOPY

Autor:	Farzana Nahid
Rok vydání:	2022
Zdroj:	Khulna University Studies. :243-248
ISSN:	2789-2697 1563-0897
DOI:	10.53808/kus.2010.10.1and2.0914-e
Popis:	The intensity variation of positronium as a result of electron irradiation has been studied on polyurethanes (PU) using positron annihilation lifetime spectroscopy (PALS). The PALS measurement was carried out at room temperature with a conventional fast-fast coincidence system. The lifetime spectra were analyzed into four components using melt program to extract the positron parameters such as lifetime and intensity. Due to irradiation a decrease of intensity about 2.7% was observed up to 10kGy. Free volume radius has been calculated for electron irradiated PU. PALS measurement has also been performed to study the effect of temperature variation in the range 30K to 310K. Analysis by melt program on the spectra shows that the fourth lifetime component increases significantly above glass transition temperature.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9cadbdfd9f08cee55f2043b9fe258fe5 https://doi.org/10.53808/kus.2010.10.1and2.0914-e Zobrazit plný text záznamu