The Experts below are selected from a list of 705 Experts worldwide ranked by ideXlab platform
Jiri Stohandl - One of the best experts on this subject based on the ideXlab platform.
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The role of Organic Phosphite primary structure in the overall stabilization performance in polypropylene
Polymer Testing, 2017Co-Authors: Jiri Tochacek, Radek Matuska, Petr Polacek, Jiri StohandlAbstract:Abstract The role of the primary P 3+ 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-1 ox ) 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 P 3+ into P 5+ is responsible for 75 % Phosphite stabilization performance, regardless Phosphite acts alone or in combination with phenol. If P 3+ 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 P 3+ 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.
Jiri Tochacek - One of the best experts on this subject based on the ideXlab platform.
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The role of Organic Phosphite primary structure in the overall stabilization performance in polypropylene
Polymer Testing, 2017Co-Authors: Jiri Tochacek, Radek Matuska, Petr Polacek, Jiri StohandlAbstract:Abstract The role of the primary P 3+ 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-1 ox ) 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 P 3+ into P 5+ is responsible for 75 % Phosphite stabilization performance, regardless Phosphite acts alone or in combination with phenol. If P 3+ 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 P 3+ 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.
Pfaendner Rudolf - One of the best experts on this subject based on the ideXlab platform.
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Verfahren zur Erniedrigung der Kristallisationstemperatur von teilkristallinen Polyamiden, hierdurch hergestellte Polyamidformmasse sowie Verwendung von mehrfunktionellen umesterungsfähigen organischen Phosphoniten, organischen Phosphiten, organische
2018Co-Authors: Groos Benjamin, Pfaendner RudolfAbstract:The invention relates to a method for lowering the crystallization temperature of semicrystalline polyamides, wherein at least one semicrystalline polyamide or mixtures of at least two semicrystalline polyamides are mixed with at least one polyfunctional transesterification-capable Organic phosphonite, Organic Phosphite, Organic phosphate or mixtures of at least two of the previously mentioned compounds, the formed mixture is converted into a melt, wherein the at least one polyfunctional transesterification-capable Organic phosphonite, Organic Phosphite, Organic phosphate or the mixtures of at least two of the previously mentioned compounds are transesterified, with simultaneous transamidation of the at least one semicrystalline polyamide, and finally the mixture is cooled
Radek Matuska - One of the best experts on this subject based on the ideXlab platform.
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The role of Organic Phosphite primary structure in the overall stabilization performance in polypropylene
Polymer Testing, 2017Co-Authors: Jiri Tochacek, Radek Matuska, Petr Polacek, Jiri StohandlAbstract:Abstract The role of the primary P 3+ 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-1 ox ) 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 P 3+ into P 5+ is responsible for 75 % Phosphite stabilization performance, regardless Phosphite acts alone or in combination with phenol. If P 3+ 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 P 3+ 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.
Petr Polacek - One of the best experts on this subject based on the ideXlab platform.
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The role of Organic Phosphite primary structure in the overall stabilization performance in polypropylene
Polymer Testing, 2017Co-Authors: Jiri Tochacek, Radek Matuska, Petr Polacek, Jiri StohandlAbstract:Abstract The role of the primary P 3+ 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-1 ox ) 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 P 3+ into P 5+ is responsible for 75 % Phosphite stabilization performance, regardless Phosphite acts alone or in combination with phenol. If P 3+ 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 P 3+ 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.