Thermal antioxidants

Al‐Malaika, S.

doi:10.1007/978-94-011-4421-6_112

Cited by 4 publications

(1 citation statement)

References 4 publications

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“…Nevertheless, heating in oxygen-containing media can lead to its destruction due to oxidation. For most synthetic polymers, a radical mechanism of oxidative degradation has been proposed, the active particle of which is the peroxyl radical ROO· [ 19 , 20 ]. To solve the problem of thermal-oxidative degradation, small additives of antioxidants can be used to inhibit the degradation process, which makes it possible to prolong the service life of the polymer material [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Annealing on the Structure and Gas Transport Properties of Poly(1-Trimethylsilyl-1-Propyne) Films with the Addition of Phenolic Antioxidants

et al. 2023

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The thermally activated relaxation of poly(1-trimethylsilyl-1-propyne) (PTMSP) samples of various cis-/trans-compositions (50–80% units of cis-configuration) in the presence of phenolic antioxidants of various structures was investigated. It was pointed out that polymers with a high content of cis-units exhibited greater thermal-oxidative stability due to the greater flexibility of the cis-enriched macrochains. The use of hindered phenols as antioxidants made it possible to prevent the process of thermally initiated oxidative degradation. At the same time, the most effective stabilizing agents were antioxidants with larger molecules such as Vulkanox BKF, Irganox 1010, and Irganox 1076. It was shown that the permeability coefficients of stabilized PTMSP during thermal treatment initially slightly decreased (by 20–30%), which, according to the X-ray diffraction data, was associated with an increase in the density of the macrochain packing, and during further heating remained practically unchanged. Note that for the cis-enriched samples, no signs of oxidation or decrease in the transport characteristics were observed during polymer heating for 240 h at 140 °C.

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Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Annealing on the Structure and Gas Transport Properties of Poly(1-Trimethylsilyl-1-Propyne) Films with the Addition of Phenolic Antioxidants

et al. 2023

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Effects of a mixture of stabilizers on the structure and mechanical properties of polyethylene during reprocessing

Abad

Ares

Barral

et al. 2004

J of Applied Polymer Sci

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ABSTRACT:The properties of two polyethylenes [a highdensity polyethylene (HDPE) and a low-density polyethylene (LDPE)] were studied after several extrusion cycles. To reduce the degradation effects during the reprocessing, a mixture of two stabilizers was added to the formulations. The predominant degradation mechanism was chain scission for the HDPE and chain branching and crosslinking for the LDPE. For both polyethylenes the FTIR spectra exhibited a growth in the number of carbonyl groups as a function of the number of extrusion cycles. Their tensile properties were degraded with the reprocessing but both polyethylenes maintained their nearly constant thermal behavior and crystallinity. The addition of a primary phenolic antioxidant and a secondary phosphite antioxidant preserved the melt behavior of virgin materials after the reprocessing and reduced the degradation effects. From the tensile tests, the efficiency of the antioxidants in the LDPE was very high and, after the reprocessing, the material retained the mechanical properties of virgin LDPE. The efficiency of the antioxidants for the HDPE was not significant.

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Mechanical strength and thermal stability of magnesium silicate filled polypropylenes

Enqvist¹,

Järvelä²,

Tervala³

2001

Composite Interfaces

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Thermal antioxidants

Cited by 4 publications

References 4 publications

The Effect of Thermal Annealing on the Structure and Gas Transport Properties of Poly(1-Trimethylsilyl-1-Propyne) Films with the Addition of Phenolic Antioxidants

The Effect of Thermal Annealing on the Structure and Gas Transport Properties of Poly(1-Trimethylsilyl-1-Propyne) Films with the Addition of Phenolic Antioxidants

Effects of a mixture of stabilizers on the structure and mechanical properties of polyethylene during reprocessing

Mechanical strength and thermal stability of magnesium silicate filled polypropylenes

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