کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1883769 1533541 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Stereocomplexation of low molecular weight poly(L-lactic acid) and high molecular weight poly(D-lactic acid), radiation crosslinking PLLA/PDLA stereocomplexes and their characterization
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم تشعشع
پیش نمایش صفحه اول مقاله
Stereocomplexation of low molecular weight poly(L-lactic acid) and high molecular weight poly(D-lactic acid), radiation crosslinking PLLA/PDLA stereocomplexes and their characterization
چکیده انگلیسی

Poly(L-lactic acid)s (PLLAx) were synthesized from L-lactic acid by polycondensation. Different stereocomplexes were also obtained with equimolar mixtures of synthesized PLLAx and a commercial PDLA. The stereocomplexes were crosslinked with triallyl isocyanurate (TAIC) by gamma irradiation. Crosslinking density increased with radiation doses, the heavier the crosslinking network, the lower its swelling degree. The crosslinking structures were introduced in the stereocomplexes inhibiting the mobility for crystallization of PLLA molecules. Thermal and mechanical properties of PLA stereocomplexes were remarkably enhanced by radiation induced crosslinking. PLA stereocomplex does not seem to be degraded by PLLA degrading microorganisms existing in compost at room temperature, but the synthesized PLLA was significantly degraded.


► Complete PLA stereocomplex was obtained from synthesized PLLA and a commercial PDLA.
► Melting temperature of stereocomplex were much improved by gamma irradiation.
► Crosslinking network inhibited the mobility of polymeric chains for crystallization.
► Biodegradability of PLLA was reduced by stereocomplexation and crosslinking.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Radiation Physics and Chemistry - Volume 83, February 2013, Pages 105–110
نویسندگان
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