کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5201760 | 1502905 | 2014 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis, characterization and hydrolytic degradation of polyester-urethanes obtained by lipase biocatalysis
ترجمه فارسی عنوان
سنتز، خصوصیات و تجزیه هیدرولیتی پلی استر اوریتان به دست آمده از طریق کاتالیزوری لیپاز
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
The enzymatic synthesis of α-Ï-telechelic polycaprolactone diols (HOPCLOH) and block copolymers was studied. Synthesis of α-Ï-telechelic PCL diols was carried out by enzymatic ring opening polymerization with Yarrowia lipolytica lipase immobilized on Lewatit VP OC K2629 and Amberlyst 15, and using ethylene glycol, diethylene glycol and polyethylene glycol as initiators. Biodegradable linear polyester-urethanes were prepared from synthesized PCL diols and hexamethylenediisocyanate (HDI). Polyester-urethanes degradation was studied using thermogravimetric analysis (TGA) and hydrolysis (alkaline, acidic and neutral). It was found that content of ether linkages influences the thermal stability and hydrolytic degradation behavior of the analyzed polyurethanes. Hydrolytic degradation proceeds faster in alkaline media, in agreement with the expected susceptibility of ester COO- bonds to degradation in the polyester urethanes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 108, October 2014, Pages 188-194
Journal: Polymer Degradation and Stability - Volume 108, October 2014, Pages 188-194
نویسندگان
Karla A. Barrera-Rivera, Laura Peponi, Ángel Marcos-Fernández, José M. Kenny, Antonio MartÃnez-Richa,