Grafted mercapto-1,3,5-triazinic antioxidants for elastomers

ABSTRACT:The synthesis of N-(4-aminodiphenylmethane) acrylamide (ADPMA) was performed through the reaction of 4,4Ј-diaminodiphenyl methane and acryloyl chloride in the presence of triethyl amine. The grafting of AD-PMA onto natural rubber was executed with UV radiation. Benzoyl peroxide was used to initiate the free-radical grafting copolymerization. Natural rubber-graft-N-(4-aminodiphenyl methane) acrylamide (NR-g-ADPMA) was characterized with an IR technique. We studied the effect of aging on the mechanical properties and the swelling and extraction phenomena for acrylonitrile-butadiene copolymer (NBR) vulcanizates, which contained the prepared NR-g-ADPMA and a commercial antioxidant, N-isopropyl-NЈ-phenyl-pphenylenediamine. The prepared antioxidant enhanced both the mechanical properties of the NBR vulcanizates and the permanence of the ingredients in these vulcanizates.

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis, characterization, and evaluation of natural rubber‐graft‐N‐(4‐aminodiphenyl methane) acrylamide as an antioxidant

El-Wakil

2006

“…Highmolecular‐weight antioxidants and polymerizable antioxidants do not ensure the protection of the entire volume because they cannot diffuse through the rubber. Grafted antioxidants are high‐molecular‐weight compounds that bond by chemical treatments to the macromolecules or sometimes during the processing of the polymer, and the use of grafting antioxidants is one of the best ways of protecting unsaturated rubbers5, 6…”

Section: Introductionmentioning

confidence: 99%

Upgrading of acrylonitrile–butadiene copolymer properties using natural rubber–graft–N‐(4‐aminodiphenylether) acrylamide

Al-Ghonamy

Barakat

2010

The grafting of ADPEA onto natural rubber was executed with UV radiation. Benzoyl peroxide was used to initiate the free-radical grafting copolymerization. Natural rubber-graft-N-(4-aminodiphenylether) acrylamide (NR-g-ADPEA) was characterized with an IR technique. The ultrasonic velocities of both longitudinal and shear waves were measured in thermoplastic discs of NBR vulcanizates as a function of aging time. Ultrasonic velocity measurements were taken at 2 MHz ultrasonic frequency using the pulse echo method. We studied the effect of aging on the mechanical properties and the swelling and extraction phenomena for acrylonitrile-butadiene copolymer (NBR) vulcanizates, which contained the prepared NR-g-ADPEA and a commercial antioxidant, N-isopropyl-N 0 -phenyl-p-phenylenediamine. The prepared antioxidant enhanced both the mechanical properties of the NBR vulcanizates and the permanence of the ingredients in these vulcanizates.

“…Various stabilizer types including hindered phenols1–5 and hindered‐amine light stabilizers6–10 are commonly used in the prevention of thermo‐ and photo‐oxidative degradation. Other kinds of compounds: triazine derivatives,11–13 organic sulphites,14 metal chelates,15 and so on were previously tested as antioxidants.…”

Section: Introductionmentioning

confidence: 99%

Kinetic effects of selenium on degradation of ethylene–propylene copolymer

Zaharescu

Jipa

Mihalcea

2001

ABSTRACT:The antioxidation protection of elementary selenium added to an ethylenepropylene copolymer (EPR) at different concentrations (0.1, 0.2, and 0.5 phr) was studied. Oxygen uptake measurements were isothermally performed at 180°C on polymer samples stabilized with increasing concentrations of Se. Experimental data have revealed the enhancement in induction periods and the decrease in oxidation rates for unaged elastomer samples. Stabilized polymer specimens exposed to ␥-radiation have presented the highest effects at 0.5 phr of selenium concentration for all irradiation doses (50, 100, 150, and 250 kGy). Influence of selenium on the competition between crosslinking and oxidation occurred in ␥-irradiated ethylene-propylene elastomers discussed on the basis of kinetic treatment on studied thermal degradation process.