کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5188149 1381147 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Polylactide compositions. Part 1: Effect of filler content and size on mechanical properties of PLA/calcium sulfate composites
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Polylactide compositions. Part 1: Effect of filler content and size on mechanical properties of PLA/calcium sulfate composites
چکیده انگلیسی
Starting from calcium sulfate (gypsum) as a fermentation by-product of lactic acid fermentation, novel high performance composites have been produced by melt-blending polylactide (PLA) and previously dried calcium sulfate hemihydrate in a Brabender bench scale kneader at 190 °C. Due to PLA sensitivity towards hydrolysis, it has first been demonstrated that formation of β-anhydrite II (AII) by adequate thermal treatment of calcium sulfate is a prerequisite. Then, the effect of filler content and mean diameter on thermal, mechanical and impact properties has been examined together with the morphology of the resulting materials. It shows that high tensile performances and impact strength are maintained up to a filler content of 20 wt% without any increase of PLA crystallinity. Interestingly enough and provided that AII particles with a mean diameter of ca. 10 μm were considered as PLA fillers, tensile and impact properties proved to be maintained at a very acceptable level at filler content as high as 50 wt%. Such remarkable mechanical behavior can be accounted for by the excellent filler dispersion throughout the polyester matrix and much favorable interactions between CaSO4 particles and ester functions of PLA chains as evidenced by the use of predictive mathematical models for composite mechanical properties and SEM-BSE imaging of fractured surfaces.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 48, Issue 9, 24 April 2007, Pages 2613-2618
نویسندگان
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