Gamma radiation induced property modification of poly(lactic acid)/hydroxyapatite bio-nanocomposites

2013 ◽  
Vol 63 (6) ◽  
pp. 1063-1069 ◽  
Author(s):  
Susan Dadbin ◽  
Faranak Naimian
Keyword(s):  
Lactic Acid ◽  
Gamma Radiation ◽  
Poly Lactic Acid ◽  
Radiation Induced ◽  
Property Modification

Poly(lactic acid) stereocomplex formation: Application to PLA rheological property modification

2014 ◽  
Vol 131 (22) ◽  
pp. n/a-n/a ◽  
Author(s):  
Sajjad Saeidlou ◽  
Michel A. Huneault ◽  
Hongbo Li ◽  
Chul B. Park
Keyword(s):  
Lactic Acid ◽  
Rheological Property ◽  
Poly Lactic Acid ◽  
Stereocomplex Formation ◽  
Property Modification

Mechanical Properties of Poly(lactic acid) / Thermoplastic Starch Blends Crosslinked by Gamma Radiation

2013 ◽  
Vol 781-784 ◽  
pp. 467-470 ◽  
Author(s):  
Siriruck Kalapakdee ◽  
Thirawudh Pongprayoon ◽  
Kasinee Hemvichian ◽  
Phiriyatorn Suwanmala ◽  
Wararat Kangsumrith
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Gamma Radiation ◽  
Crosslinking Agent ◽  
Thermoplastic Starch ◽  
Poly Lactic Acid ◽  
Optimum Dose ◽  
Gel Fraction ◽  
Twin Screw ◽  
Starch Blends

This research aims to determine the influences of radiation-induced crosslinking on the mechanical properties of polymer blends between poly (lactic acid) (PLA) and thermoplastic starch (TPS). PLA and TPS were mixed at different ratios (90:10, 80:20, 70:30, 60:40) in the presence of a crosslinking agent using a twin screw extruder. The blends were compression molded into films. The film samples were irradiated by gamma radiation at different doses. Gel fraction was used to determine crosslinking efficiency. Results showed that gamma radiation was able to induce crosslinking for PLA/TPS blends. The gel fraction and mechanical properties decreased with increasing TPS content. The optimum ratio of PLA:TPS with the maximum gel fraction and mechanical properties was 90:10 and the optimum dose was 40 kGy by gamma radiation.

Structural Changes in Poly(lactic acid)/Hydroxyapatite Nanocomposites by Gamma Irradiation

2013 ◽  
Vol 829 ◽  
pp. 258-262
Author(s):  
Susan Dadbin ◽  
Faranak Naimian ◽  
Sorour Hasanpoor
Keyword(s):  
Lactic Acid ◽  
Gamma Irradiation ◽  
Irradiation Dose ◽  
Structural Changes ◽  
Chain Scission ◽  
Poly Lactic Acid ◽  
Casting Method ◽  
Radiation Induced ◽  
Solution Casting Method ◽  
Crosslinking Reactions

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.

Electrical Properties of Heat-Treated Poly-Lactic Acid

2011 ◽  
Vol 131 (5) ◽  
pp. 395-400 ◽  
Author(s):  
Toru Oi ◽  
Katsuyoshi Shinyama ◽  
Shigetaka Fujita
Keyword(s):  
Lactic Acid ◽  
Electrical Properties ◽  
Poly Lactic Acid ◽  
Heat Treated

Dielectric Breakdown Properties of Poly-Lactic Acid with Spherulites Growth

2014 ◽  
Vol 134 (4) ◽  
pp. 237-242
Author(s):  
Naru Matsugasaki ◽  
Katsuyoshi Shinyama ◽  
Shigetaka Fujita
Keyword(s):  
Lactic Acid ◽  
Dielectric Breakdown ◽  
Poly Lactic Acid
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