کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5205546 1502933 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The role of organic phosphite primary structure in the overall stabilization performance in polypropylene
ترجمه فارسی عنوان
نقش ساختار اولیه فسفات آلی در عملکرد کلی تثبیت کننده در پلی پروپیلن
کلمات کلیدی
فسفیت، فسفات، اکسیداسیون، مکانیسم عمل، در حال پردازش،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی
The role of the primary P3+ functionality in the phosphite overall stabilization performance was re-evaluated. Tris(2,4-di-t-Bu-phenyl)phosphite (P-1) and its oxidation product tris(2,4-di-t-Bu-phenyl)phosphate (P-1ox) were tested both alone and in the presence of hindered phenol during processing in polypropylene. Efficiencies were quantified using the processing degradation index (PDI). The position of the traditional multiple extrusion curve was determined by a single parameter, describing the degree of polymer degradation. Its reciprocal allowed calculating formulations relative efficiencies. It was shown that oxidation of P3+ into P5+ is responsible for 75 % phosphite stabilization performance, regardless phosphite acts alone or in combination with phenol. If P3+ is completely oxidized, stabilizer still works. For the residual performance, the reactions of 2,4-di-t-Bu-phenyl substituents (secondary structure), are responsible. Besides processing, reactions of P3+ also contribute to the long-term stability at 150 °C. Once phosphite is oxidized, the secondary structure does not contribute to the long-term stability at all.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 57, February 2017, Pages 126-132
نویسندگان
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