Grafting antioxidants. V Phenols with mercaptoheterocyclic substituents as antioxidants for dienic rubbers

Herdan, J. M.; Giurginca, Maria

doi:10.1016/0141-3910(93)90038-k

Cited by 14 publications

(9 citation statements)

References 7 publications

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“…Finally, if the polymer is in contact with appropriate solvents during service, these may lead to the loss of a soluble antioxidant via leaching 3. To avoid the loss of antioxidants through extraction or volatilization; macromolecular, polymerizable, or grafting antioxidants may be used 4. High‐molecular‐weight antioxidants and polymerizable antioxidants do not ensure the protection of the entire volume because they cannot diffuse through the rubber.…”

Section: Introductionmentioning

confidence: 99%

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

El-Wakil

2006

J of Applied Polymer Sci

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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.

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Section: Introductionmentioning

confidence: 99%

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

El-Wakil

2006

J of Applied Polymer Sci

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“…The activity of the aminoacids was correlated with their acidity constants [7]. The glutation has an inhibiting activity similar to that of cysteine, both possessing ÀSH groups which, by subsequent oxidations, generate intermediaries with antioxidative capacity [8].…”

Section: Resultsmentioning

confidence: 99%

Redox Properties of Some Aminoacids and Proteins

Iosub

Giurginca

Badea

et al. 2006

Molecular Crystals and Liquid Crystals

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In order to characterize redox properties of biomolecules, specific methods for evaluating the antioxidant capacity of some biological structures or their components (like aminoacids) are used, such as chemiluminescence (CL) and cyclic voltametry coupled with UV-VIS spectroscopy. The CL antioxidant capacity, the reduction potential (e 1=2 ), and the anodic current intensity (I a ) have been determined by controlling the behavior of the compounds under redox conditions. The value of the half-wave potential of the first peak was correlated with the reduction tendency on the electrode, and this behavior was analyzed in relation to the antioxidant capacity observed by CL.

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“…As reported in the literature, antioxidants containing mercapto groups are employed to protect rubber vulcanizates against aging. 26,27 The difference in the addition order of the compatibilizing agents on the NBR/EPDM65 blends did not exert any substantial influence on the aging properties. Both EPDMTA, EPDMSH, and the graft copolymer resulted in blends with higher aging resistance than the noncompatibilized blends.…”

Section: Effect Of Thermal Agingmentioning

confidence: 97%

Mercapto‐modified copolymers in polymer blends. III. The effect of functionalized ethylene‐propylene‐diene rubber (EPDM) on curing and mechanical properties of NBR/EPDM blends

Oliveira

Soares

2001

J of Applied Polymer Sci

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Ethylene-propylene-diene with ethylene norbornene as the diene (EPDM) samples functionalized with thioacetate (EPDMTA) or mercapto groups (EPDMSH) were employed as compatibilizing agents for nitrile rubber (NBR)/EPDM blends. The cure rate of the blend was affected by the presence of a small portion of these compounds. EPDMTA decreases the cure rate of the blends, whereas EPDMSH was able to decrease the scorch time and increase the cure rate when employed in a proportion as high as 5.0 phr. The compatibilization effect was influenced by the nature of the EPDM employed in the blends. Blends consisting of an EPDM sample with lower viscosity display better dispersion of the EPDM phase inside the NBR matrix and also better mechanical performance with the compatibilization. The compatibilization with EPDMSH is reactive, with the formation of chemical bond between the mercapto groups of the compatibilizing agent and the double bond of the diene rubber. The compatibilization with EPDMTA is also considered to be reactive because the vulcanized blends containing this functionalized copolymer contain a higher amount of cross linked material, as indicated by the lower weight loss after swelling experiments. A scanning electron micrograph demonstrated that these functionalized copolymers led to a finer phase morphology, mainly in NBR/EPDM57C blends. The compatibilization increases the dynamic elastic modulus without affecting the damping. An improvement of thermal aging resistance of the studied blends was also achieved with the presence of the functionalized copolymers.

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Grafting antioxidants. V Phenols with mercaptoheterocyclic substituents as antioxidants for dienic rubbers

Cited by 14 publications

References 7 publications

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

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

Redox Properties of Some Aminoacids and Proteins

Mercapto‐modified copolymers in polymer blends. III. The effect of functionalized ethylene‐propylene‐diene rubber (EPDM) on curing and mechanical properties of NBR/EPDM blends

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