کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1385318 982441 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
In situ polymerization of starch with lactic acid in aqueous solution and the microstructure characterization
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
In situ polymerization of starch with lactic acid in aqueous solution and the microstructure characterization
چکیده انگلیسی

Copolymers of starch grafted with poly (lactic acid) were directly prepared by in situ reaction of cornstarch with lactic acid in aqueous media in the presence of stannous 2-ethyl hexanoate [Sn(Oct)2]. The procedure of the graft reaction was elucidated, based on the HPLC analysis, as the ring-opening polymerization (ROP) from starch surface of the small amounts of lactide produced in situ in the reaction system. The detailed chemical microstructure of the resultant graft copolymer was clarified by one- and two-dimensional NMR spectroscopy. Analysis of 13C NMR spectra of the carbons in starch ring as well as the carbonyl carbons in LA moiety demonstrates that the reactivity of hydroxyl groups at glucopyranan unit of starch decreases in the order of C-6>C-3>C-2. The average length of PLA grafts at individual starch ring carbons was also investigated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 64, Issue 4, 16 June 2006, Pages 501–509
نویسندگان
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