Synthesis and Characterization of Poly(Glycerol Sebacate)-co-Lactic Acid via Gamma Irradiation

2015 ◽  
Vol 1098 ◽  
pp. 75-79
Author(s):  
Michael Giles B. Dupio ◽  
Gandy M. Nunez ◽  
Lucille V. Abad ◽  
Charito T. Aranilla ◽  
Eduardo R. Magdaluyo

The gamma irradiation was utilized to facilitate the synthesis of poly (glycerol sebacate)-co-lactic acid (PGS-co-LA). The effect of methyl methacrylate (MMA) crosslinker and varying dosage of irradiation to the structural composition and thermal properties of the synthesized PGS-co-LA was investigated. Compositional analyses of the polymer materials using infrared spectroscopy confirm the covalent formation of ester linkage. The use of methyl methacrylate enhances the formation of the characteristic bonds in the polymer structure. The intensity of these peaks increases with increasing irradiation dosage and high amount of crosslinker. The melting temperature of the PGS-co-LA becomes more negative with the incorporation of high amount of MMA.

2012 ◽  
Vol 200 ◽  
pp. 397-400 ◽  
Author(s):  
Xiao Hui Zhang ◽  
Wen Juan Gu ◽  
Hou Bin Li ◽  
Yi Xiang Tang ◽  
Long Qi Wu

A series of star-shaped polylactic acid was synthesized using L-lactic acid (L-LA) and octa(γ-chloroammoniumpropyl) octasilsesquioxane (POSS-NH3Cl) by in the presence of stannous(II) octanoate (Sn(Otc)2) catalyst. The structures and properties of these dendritic polymers were characterized by FTIR, 1H-NMR and TGA, respectively. These results demonstrated that the chemical reaction between POSS-NH3Cl and L-LA had been taken place, and the novel star-shaped polylactic acid (POSS-g-PLLA) had been synthesized. And thermal properties, such as melting temperature and decomposition temperature, were obviously improved along with the increment of the added amount of POSS-NH3Cl. The decomposition temperature of POSS-g-PLLA was higher ca. 70°C higher than that of PLLA, also higher 65°C than that of POSS-NH3Cl/PLLA.


2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Evelyn Carolina Martínez Ceballos ◽  
Ricardo Vera Graziano ◽  
Gonzalo Martínez Barrera ◽  
Oscar Olea Mejía

Poly(dichlorophosphazene) was prepared by melt ring-opening polymerization of the hexachlorocyclotriphosphazene. Poly[bis(2-hydroxyethyl-methacrylate)-phosphazene] and poly[(2-hydroxyethyl-methacrylate)-graft-poly(lactic-acid)-phosphazene] were obtained by nucleophilic condensation reactions at different concentrations of the substituents. The properties of the synthesized copolymers were assessed by FTIR,1H-NMR and31P-NMR, thermal analysis (DSC-TGA), and electron microscopy (SEM). The copolymers have a block structure and show twoTg's below room temperature. They are stable up to a temperature of 100°C. The type of the substituents attached to the PZ backbone determines the morphology of the polymers.


2009 ◽  
Vol 30 (5) ◽  
pp. 569-575 ◽  
Author(s):  
Horia M. Nizam El-Din ◽  
El-Sayed A. Hegazy ◽  
Doaa M. Ibraheim

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