Transformation products of hindered phenolic antioxidants and colour development in polyolefins (Record no. 52119)

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control field MX-MdCICY
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20250625160220.0
040 ## - CATALOGING SOURCE
Transcribing agency CICY
090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN)
Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) B-17959
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
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245 10 - TITLE STATEMENT
Title Transformation products of hindered phenolic antioxidants and colour development in polyolefins
490 0# - SERIES STATEMENT
Volume/sequential designation Polymer Degradation and Stability, 34(1-3), p.333-346, 1991
520 3# - SUMMARY, ETC.
Summary, etc. Several quinoidal oxidation products of 2,6-di-t-butyl-phenol-based antioxidants have been evaluated for UV/visible absorption characteristics in methylene chloride solutions and for contributions to Yellowness Index (YI)values in polyolefins. The YI values were determined in polypropylene (PP), high density polyethylene (HDPE)and linear low density polyethylene (LLDPE). The quinoidal compounds with conjugated ?-electrons exhibited the highest extinction coefficients in the visible spectrum and also contributed the most colour to polymer formulations. 3,3?,5,5?-Tetra-tert-butyl-stilbene-4,4?-quinone had the highest extinction coefficient in the visible spectrum and caused the highest YI values in the polyolefins-its presence at 5 ppm in the polyolefins was already discernible visually. Colour development during use of polymeric articles containing hindered phenolic antioxidants is attributed to the formation of conjugated quinoidal products as a consequence of radical trapping by the hindered phenols. It is a natural consequence of the stabilization process which can be ameliorated through appropriate choice of antioxidants and through the use of trivalent phosphorus coadditives.
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element HENOLIC ANTIOXIDANTS
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element POLYOLEFINS
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Klemchuk, P. P.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Horng, P. L.
856 40 - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier <a href="https://drive.google.com/file/d/1hT5viLdumn4xAazJw9GYhvCbD5hbcbZA/view?usp=drivesdk">https://drive.google.com/file/d/1hT5viLdumn4xAazJw9GYhvCbD5hbcbZA/view?usp=drivesdk</a>
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Source of classification or shelving scheme Clasificación local
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  Clasificación local     Ref1 CICY CICY Documento préstamo interbibliotecario 25.06.2025   B-17959 25.06.2025 25.06.2025 Documentos solicitados