| Structural changes in poly (lactic acid)/hydroxyapatite nanocomposites by gamma irradiation |
| Paper ID : 2037-UFGNSM13-FULL (R1) |
| Authors: |
|
Susan Dadbin * North Kargar Ave. |
| Abstract: |
| Poly (lactic acid)/hydroxyapatite (PLA/HAP) nanocomposites were made via solution casting method and subjected to gamma irradiation at doses of 30 and 50 kGy. FTIR spectra of the nanocomposites displayed structural changes in the crystalline phase of PLA upon irradiation. The PLA/HAP nanocomposites of 6 and 10 pph HAP irradiated at 30 kGy showed higher tensile strengths. This was attributed to radiation-induced crystallinity that verified by DSC crystallinity measurements. Using triallyl isocyanurate (TAIC) as a multifunctional monomer promoted radiation-induced crosslinking reactions in PLA that was manifested by improvements in the tensile strength of the nanocomposites. Optimum values for TAIC, irradiation dose and HAP content were found as 1 pph, 30 kGy and 10 pph respectively. Raising the irradiation dose from 30 to 50 kGy prompted chain scission reactions that had adverse effects on tensile properties. |
| Keywords: |
| Keywords: Poly (lactic acid) - Hydroxyapatite- Nanocomposite-Gamma Irradiation- Crystallinity |
| Status : Paper Accepted (Poster Presentation) |
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