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Environmental Chemistry Letters - Advanced drug delivery systems are now designed with biodegradable, biocompatible and non-toxic materials such as polysaccharides. Pullulan is a polysaccharide... 相似文献
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Rodica Lipsa Nita Tudorachi Cornelia Vasile Aurica Chiriac Anca Grigoras 《Journal of Polymers and the Environment》2013,21(2):461-471
Modified natural polymers have been gaining increasing scientific interest for many years. In this study carboxymethyl starch (CMS) was grafted with L(+)-lactic acid (LA) in different molar ratios CMS/LA (1/36, 1/22 and 1/12), resulting carboxymethyl starch-g-poly(lactic acid) (CMS-g-PLA) copolymers. The grafting reaction was carried out by solution polycondensation procedure in toluene and stannous 2-ethyl hexanoate Sn(Oct)2 as catalyst was utilized. Poly(lactic acid) (PLA) was synthesized in the same conditions with the copolymers for comparative analyses of the physico-chemical and thermal properties. The copolymers and PLA were structurally and morphologically characterized by FT-IR, 1H-NMR spectroscopy, WAXD and SEM analyses, taking CMS as reference. The molecular weight of the copolymers, CMS and PLA were determined, using a dynamic light scattering technique. The thermal behavior of the products was studied by DSC and TG-DTG analyses. The CMS-g-PLA graft copolymers exhibited lower Tg and thermal stability than pure CMS. 相似文献
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Ilias N. Tziavos Thomas K. Alexandridis Borys Aleksandrov Agamemnon Andrianopoulos Ioannis D. Doukas Ion Grigoras Vassilios N. Grigoriadis Ioanna D. Papadopoulou Paraskevas Savvaidis Argyrios Stergioudis Liliana Teodorof Georgios S. Vergos Lyudmila Vorobyova Georgios C. Zalidis 《Environmental monitoring and assessment》2016,188(8):492
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