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TOCHÁČEK, J. MATUŠKA, R. POLÁČEK, P. ŠTOHANDL, J.
Originální název
The role of organic phosphite primary structure in the overall stabilization performance in polypropylene
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
angličtina
Originální abstrakt
The role of the primary P3+ functionality in the phosphite overall stabilization performance was reevaluated. 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. © 2016 Elsevier Ltd. All rights reserved.
Klíčová slova
Phosphite; Phosphate; Oxidation; Action mechanism; Processing
Autoři
TOCHÁČEK, J.; MATUŠKA, R.; POLÁČEK, P.; ŠTOHANDL, J.
Vydáno
1. 2. 2017
Nakladatel
Elsevier
Místo
Velká Británie
ISSN
0142-9418
Periodikum
POLYMER TESTING
Ročník
57
Číslo
1
Stát
Spojené království Velké Británie a Severního Irska
Strany od
126
Strany do
132
Strany počet
7
BibTex
@article{BUT130309, author="Jiří {Tocháček} and Radek {Matuška} and Petr {Poláček} and Jiří {Štohandl}", title="The role of organic phosphite primary structure in the overall stabilization performance in polypropylene", journal="POLYMER TESTING", year="2017", volume="57", number="1", pages="126--132", doi="10.1016/j.polymertesting.2016.11.014", issn="0142-9418" }