Gamma irradiation of melt processed biomedical PDLLA/HAP nanocomposites

Autor:	Susan Dadbin, Yahya Kheirkhah
Rok vydání:	2014
Předmět:	chemistry.chemical_classification Radiation Nanocomposite Materials science Polymer law.invention Crystallinity Chemical engineering chemistry law Transmission electron microscopy Ultimate tensile strength Irradiation Elongation Crystallization
Zdroj:	Radiation Physics and Chemistry. 97:270-274
ISSN:	0969-806X
DOI:	10.1016/j.radphyschem.2013.12.001
Popis:	Poly( d - l lactide) PDLLA/hydroxyapatite (HAP) nanocomposites at various compositions were prepared by melt-compounding process and then subjected to gamma irradiation at a dose of 30 kGy. The morphology of the nanocomposites, characterized by transmission electron microscopy (TEM), displayed HAP nanoparticles at various sizes ranging from 10 to 100 nm distributed almost evenly within the polymer matrix. Differential scanning calorimetric (DSC) analysis of the irradiated nanocomposites showed an increase in the degree of crystallinity along with a melting peak split. The double melting peak suggested formation of different crystalline structures in the radiation exposed nanocomposites. Also the cold crystallization peak shifted to lower temperatures and became much sharper upon irradiation, indicating higher crystallization rate. The irradiated nanocomposites showed lower tensile strength and elongation at break, suggesting occurrence of some chain scission reactions in the PLA.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::14e4393ca7f65a16a11e222390386666 https://doi.org/10.1016/j.radphyschem.2013.12.001 Zobrazit plný text záznamu Full Text from ScienceDirect