Thermal ageing of acrylonitrile-butadiene copolymer

Delor‐Jestin, Florence; Barrois-Oudin, N; Cardinet, C.; Lacoste, J.; Lemaire, J.

doi:10.1016/s0141-3910(00)00035-5

Cited by 64 publications

(64 citation statements)

References 12 publications

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“…The decrease in intensity of the ENB dienic double bond characteristic band at 808 cm À1 [20,21] was followed during the crosslinking process. The (CH 2 ) n (n !…”

Section: Ftir Characterizationmentioning

confidence: 99%

Characterization of Metallocene Epdm Terpolymers with High Diene and Propylene Content Crosslinked by Dicumyl Peroxide and β‐Radiation

Nicolás

Ressia

Vallés

et al. 2004

Macro Chemistry & Physics

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Summary: Two metallocene EPDMs with the same weight fraction of ethylene but differing in diene content were crosslinked, either by dicumyl peroxide (DCP) or β‐radiation. The effect of different diene and propylene content on the molecular structure and the mechanical properties once the materials were crosslinked was studied. The final gel content was very high due to the large level of unsaturations. The crosslinking process was monitored by FTIR spectroscopy by following the decay of unsaturations and the variation of the carbonyl groups that are related to the oxidation grade. It was found that β‐radiation crosslinked samples exhibited a lower oxidation grade than those crosslinked by DCP. An oscillant disc rheometer was employed to follow the evolution of the rheological properties, the scorch time, and the time corresponding to full cure during the crosslinking reaction with DCP. In addition, in order to characterize the state of cure we have studied the rheological properties in shear employing a dynamic parallel plate geometry. These results were correlated with those obtained from the molecular characterization of the soluble fraction by size exclusion chromatography. The experiments indicate that, at low irradiation doses, there is a high rate of chain scission reactions that cause an important decrease in storage modulus. Whereas, at high irradiation doses the rate of chain scission reactions diminishes, thus the storage modulus increases but it still remains at lower levels than those corresponding to the original terpolymers. The tensile properties, hardness (Shore A) and compression set tests also suggest the presence of chain scission reactions.Storage modulus (G′) versus frequency for a β‐irradiated sample.magnified imageStorage modulus (G′) versus frequency for a β‐irradiated sample.

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“…The decrease in intensity of the ENB dienic double bond characteristic band at 808 cm À1 [20,21] was followed during the crosslinking process. The (CH 2 ) n (n !…”

Section: Ftir Characterizationmentioning

confidence: 99%

Characterization of Metallocene Epdm Terpolymers with High Diene and Propylene Content Crosslinked by Dicumyl Peroxide and β‐Radiation

Nicolás

Ressia

Vallés

et al. 2004

Macro Chemistry & Physics

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“…It has been demonstrated that the migration of additives and extra crosslinking predominated and nearly no chain scission-induced small molecules formed [21]. Therefore, a question appears: is there any relationship among the changes of additives, chemical structures and mechanical properties?…”

Section: Relationship Among the Changes Of Additives Chemical Structmentioning

confidence: 99%

“…During thermal aging, various structural changes including extra crosslinking, oxidation and chain scission take place. However, the concentration of aginginduced oxidation products on the backbone is quite low, so the difference between the pyrograms of rubbers before and after aging is too small to be detected, or the difference is overlapped by the inhomogeneity of samples [19][20][21]. It is also difficult to detect the chain-scission-induced very little small molecular weight degradation fragments during aging.…”

Section: Introductionmentioning

confidence: 99%

“…During thermal aging, mainly three changes occurred successively: (1) of macromolecular chains [23]. By flash evaporation, the loss of antioxidant and paraffin was monitored [21]. However, how the additive loss affects the deterioration of mechanical properties, i.e., the relationship between the chemical changes and the mechanical properties, is still unclear and needs to be investigated.…”

Section: Introductionmentioning

confidence: 99%

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Volatile components changes during thermal aging of nitrile rubber by flash evaporation of Py-GC/MS

Zhao

Liu

et al. 2015

Journal of Analytical and Applied Pyrolysis

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“…It should be also stressed that the thermal decomposition rate of NBR, dm/dt, is lower and the residue remain ing after this decomposition is higher, P e , compared to those of SBR (Table 1). It follows from considerably greater cohesion forces between the chains of NBR macromolecules, which facilitate the processes of cyclization and carbonization during thermal decom position under thermo oxidative conditions (Table 1) [16][17][18].…”

Section: Thermal Properties Of Rubbers and Their Vulcanizatesmentioning

confidence: 99%

Thermal properties of diene elastomers

2014

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Abstract-The paper presents the results of investigating the effect of the macromolecule chemical structure and the spatial network structure of butadiene (BR), butadiene styrene (SBR) and butadiene acrylonitrile (NBR) rubbers on their thermal properties. The rubbers were cross linked by the conventional method by means of dicumyl peroxide or sulfur as well as by the non conventional way using iodoform (CH 3 I). The rub ber and their vulcanizates were assessed by the derivatographic method (under air) and by means of differen tial scanning calorimetry (DSC) under inert gas. The thermal cross linking degree of the polydienes and the efficiency of the cross linking processes, dependent on both the chemical structure of elastomer macromol ecules and their spatial network structure were determined. The cross linking of elastomers with iodoform changes the thermal properties of polymers, significantly increasing their glass transition temperature during both sample heating and cooling, which results from the increase in mutual interaction of macromolecules connected with their modification with iodine compounds.

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Thermal ageing of acrylonitrile-butadiene copolymer

Cited by 64 publications

References 12 publications

Characterization of Metallocene Epdm Terpolymers with High Diene and Propylene Content Crosslinked by Dicumyl Peroxide and β‐Radiation

Characterization of Metallocene Epdm Terpolymers with High Diene and Propylene Content Crosslinked by Dicumyl Peroxide and β‐Radiation

Volatile components changes during thermal aging of nitrile rubber by flash evaporation of Py-GC/MS

Thermal properties of diene elastomers

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