Journal ArticleDOI
The effect of metals on thermal degradation of polyethylenes
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TLDR
In this paper, a chemiluminescence study on thermal degradation of some polyethylenes (LDPE, LLDPE and HDPE) on seven metal trays in the presence of triazines as stabilisers was carried out.About:
This article is published in Polymer Degradation and Stability.The article was published on 2004-04-01. It has received 60 citations till now. The article focuses on the topics: Linear low-density polyethylene & Low-density polyethylene.read more
Citations
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Kinetics of thermal degradation of nanometer calcium carbonate/linear low-density polyethylene nanocomposites
TL;DR: In this paper, the thermal properties of linear low-density polyethylene (LLDPE) were analyzed using a series of testing methods such as TGA, differential thermogravimetry analysis, Kim-Park method, and Flynn-Wall-Ozawa method.
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Transition metal catalyzed oxidative aging of low density polyethylene: effect of manganese (III) acetate
TL;DR: In this paper, the effect of manganese acetate in the degradation of low density polyethylene (LDPE) was discussed and a detailed study has been made to investigate the impact of dispersion promoter on degradation of LDPE.
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Discoloration Effects of High-Dose γ-Irradiation and Long-Term Thermal Aging of (U)HMW-PE
Anja Kömmling,Emmanouil Chatzigiannakis,Jörg Beckmann,Volker Wachtendorf,Kerstin von der Ehe,Ulrike Braun,Matthias Jaunich,Ulrich Schade,Dietmar Wolff +8 more
Abstract: Two polyethylene types with ultra-high (UHMW-PE) and high molecular weight (HMW-PE) used as neutron radiation shielding materials in casks for radioactive waste were irradiated with doses up to 600 kGy using a 60Co gamma source. Subsequently, thermal aging at 125°C was applied for up to one year. Degradation effects in the materials were characterized using colorimetry, UV-Vis spectroscopy, IR spectroscopy, and DSC. Both materials exhibited a yellowing upon irradiation. The discoloration of UHMW-PE disappeared again after thermal aging. Therefore, the yellowing is assumed to originate from annealable color centers in the form of free radicals that are trapped in the crystalline regions of the polymer and recombine at elevated temperatures. For the antioxidant-containing HMW-PE, yellowing was observed after both irradiation and thermal aging. The color change was correlated mainly to decomposition products of the antioxidant in addition to trapped radicals as in UHMW-PE. Additionally, black spots appeared after thermal aging of HMW-PE.
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Thermally conductive high‐density polyethylene as novel phase‐change material: Application‐relevant long‐term stability
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Enhancement of Thermal Conductivity of Poly(methylmethacrylate) Composites at Low Loading of Copper Nanowires
TL;DR: In this article, the authors reported the synthesis of copper nanowires (CuNWs) and the enhanced thermal conductivity of poly(methylmethacrylate) (PMMA) composites at low-loading fractions of CuNW.
References
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Book
Oxidation inhibition in organic materials
Jan Pospíšil,Peter P. Klemchuk +1 more
TL;DR: In this paper, a two volume publication provides an overview of processes developed to inhibit oxidative deterioration of organic materials, including the major mechanisms involved, oxidation inhibitors classes, and practices in oxidation inhibition.
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Role of metals and metal-deactivators in polymer degradation
TL;DR: In this article, the role of metal compounds in the degradation of polyolefins has been investigated and some typical examples of degradation by metallic compounds, mostly commercial pigments and transition metal compounds of stearic acid and acetylacetone, in typical commercial polymers are discussed.
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Chemiluminescence from peroxides in polypropylene. Part I: Relation of luminescence to peroxide content
TL;DR: The weak chemiluminescence observed when partially oxidised samples of polypropylene are heated in an inert atmosphere has been studied as a function of oxidation as discussed by the authors, and the integrated luminescence is shown to be proportional to titratable peroxides in the early stages of oxidation but the relation is curved at higher oxidation levels.
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DTA for control of stability in polyolefin wire and cable compounds
TL;DR: Differential thermal analysis offers a convenient and rapid way of determining stabilization levels in polyolefin compositions as discussed by the authors, however, because the chemistry of the polymer system at these temperatures may be quite different from that at normal use temperatures, judgment must be exercised in attempting to extrapolate high temperature data.