کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5182892 1381002 2012 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis of stereo multiblock polylactides by dual terminal couplings of poly-L-lactide and poly-D-lactide prepolymers: A new route to high-performance polylactides
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Synthesis of stereo multiblock polylactides by dual terminal couplings of poly-L-lactide and poly-D-lactide prepolymers: A new route to high-performance polylactides
چکیده انگلیسی

Poly-L-lactide (PLLA) having two anthracene (diene) terminals and poly-D-lactide (PDLA) having two maleimide (dienophile) termainals were prepared by the ordinary ring-opening polymerization (ROP) of L- and D-lactides with the corresponding functional initiators followed by the coupling reaction of the resultant terminal hydroxyls of the PLLA and PDLA prepolymers with hexamethylene diisocyanate (HMDI), respectively. The di-functional PLLA and PDLA obtained were then mixed and subjected to Diels-Alder coupling to spontaneously form PLLA-PDLA stereo multiblock copolymers (m-sb-PLA: PLLA-multi-PDLA) whose block sequences could readily be controlled by changing the molecular weight of the PLLA and PDLA prepolymers first synthesized by the ROP. The finally chain-extended m-sb-PLAs were found to have excellent thermal stability and thermo-mechanical properties because of the easy formation of stereocomplex crystals of PLLA and PDLA by retaining high molecular weight. This synthetic method based on the dual terminal couplings can afford a convenient route to stereo block copolymers of PLLA and PDLA having excellent properties and processability.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 53, Issue 26, 7 December 2012, Pages 6053-6062
نویسندگان
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