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Gamma radiation induced property modification of poly(lactic acid)/hydroxyapatite bio‐nanocomposites
Author(s) -
Dadbin Susan,
Naimian Faranak
Publication year - 2014
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4611
Subject(s) - nanocomposite , crystallinity , materials science , ultimate tensile strength , differential scanning calorimetry , fourier transform infrared spectroscopy , nanoparticle , chemical engineering , polymer , nuclear chemistry , transmission electron microscopy , casting , irradiation , composite material , polymer chemistry , chemistry , nanotechnology , engineering , physics , nuclear physics , thermodynamics
Poly(lactic acid)/hydroxyapatite ( PLA / HAP ) nanocomposite films with various compositions, 2 − 70 parts HAP per 100 of the PLA polymer (pph), were made via the solution casting method. Transmission electron microscopy images of the PLA / HAP films exhibited spherical particles in the size range from nearly 10 nm to 100 nm dispersed within the polymeric matrix. Fourier transform infrared spectra of the nanocomposites revealed an interaction between PLA and HAP nanoparticles by carbonyl group peak shift. Incorporation of HAP nanoparticles in the PLA matrix stimulated crystal growth verified by differential scanning calorimetry. The films irradiated with γ‐rays at a dose of 30 kGy also showed an increase in crystallinity. The X‐ray diffraction patterns of the irradiated PLA exhibited two new peaks at around 16° and 19°, assigned to the α crystalline phase of PLA ; these were absent in the unirradiated nanocomposites. Significant ductile behavior was observed in both irradiated and unirradiated PLA nanocomposites containing 2 and 10 pph of HAP . However, the irradiated nanocomposites had higher tensile strength. © 2013 Society of Chemical Industry