Studies on a New Antireversion Agent for Sulfur Vulcanization of Diene Rubbers

Schotman, A. H. M.; Haeren, P. J. C. van; Weber, Anton; Wijk, F.G.H. van; Hofstraat, Johannes W.; Talma, Auke; Steenbergen, A.; Datta, Raja

doi:10.5254/1.3538397

Cited by 24 publications

(22 citation statements)

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“…In absence or presence of zinc oxide and stearic acid a free radical mechanism, [8][9][10] in which the active sulfurating agent is an accelerant polysulphide, seems to fit the experimental results best. The thermal scission of DPTT is proposed to take place through homolitic cleavage to produce radical species as shown in scheme [1] The unsymmetrical cleavage is also possible; however, it is not so likely, since it requires breaking of the more stable CÀ ÀS bond.…”

Section: Theorysupporting

confidence: 52%

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Vulcanization of polybutadiene rubber with dipentamethylene thiuram tetrasulfide

Posadas

Fernández

Brasero

et al. 2007

J of Applied Polymer Sci

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The cure of polybutadiene rubber (BR) with sulfur donor dipentamethylene thiuram tetrasulfide (DPTT) does not show reversion reaction, in contrast with similar natural rubber compounds. No polysulfure links are formed; whereas a great amount of À ÀCÀ ÀCÀ À crosslinks are produced. The addition of tetramethyl thiuram monosulfidic (TMTM) strongly affects the crosslinking process. Mechanical properties of the cured compounds are poor. In DPTT, curing of BR the radical species produced through homolitic cleavage of DPTT molecule seems to have sufficient energy to produce crosslinking, via allylic abstraction, and also initiate the polymerization of double bonds producing areas of high crosslinking density that induce early material failure.

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Section: Theorysupporting

confidence: 52%

“…After the degradations of the poly-and di-sulfidic crosslinks, the samples were treated with methyl iodide to discriminate À ÀCÀ ÀCÀ À linkages from monosulfidic linkages. 9 …”

Section: Determination Of Density Type and Distribution Of Crosslinksmentioning

confidence: 99%

Vulcanization of polybutadiene rubber with dipentamethylene thiuram tetrasulfide

Posadas

Fernández

Brasero

et al. 2007

J of Applied Polymer Sci

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“…Consequently, the controversy on the nature of the action of the active sulphurating agent remains without clarity 1. In absence or presence of zinc oxide, a free‐radical mechanism,22–26 in which the active sulphurating agent is an accelerator polysulphide as shown in the Scheme , seems to fit the experimental results best.…”

Section: Resultsmentioning

confidence: 99%

Effect of the temperature on the kinetic of natural rubber vulcanization with the sulfur donor agent dipentamethylene thiuram tetrasulphide

Posadas¹,

Fernández‐Torres²,

Valentín³

et al. 2009

J of Applied Polymer Sci

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The effect of the temperature on the kinetics of vulcanization of natural rubber with the sulfur donor agent dipentamethylene thiuram tetrasulphide (DPTT) was investigated. The oscillatory disk rheometer and differential scanning calorimetry under dynamic and isothermal conditions were used. The Coran's model was applied to set the kinetic constants within each distinct step of the vulcanization process using the obtained values of the rheometer curves. During the curing period it was observed that there were two stages. Either the torque increment (DS) or the crosslink density arise a maximum value at 130 C. The dynamic and isothermal thermograms showed two overlapped peaks during the curing reaction. These results were in concordance with those obtained by curemeter testing. In addition, the activation energy of the vulcanization process was also calculated by means of both techniques.

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“…1) taken here as a measure of crosslink density, which is almost equal for compounds (1) and (2). However, Perkalink 900 reduces a reversion rate essentially, as was for compounds made of NR and NR/BR 15, 16, 18. It has now been found that addition of a higher dosage of sulfur, when content of Perkalink 900 was preserved the same, gives higher value of the vulcametric torque for rubber (3) than those for (1) and (2).…”

Section: Resultsmentioning

confidence: 93%

“…One of them is Perkalink 900. There are some works on the influence of this modifier introduction on service properties 15–18. However, what changes in a structure of such rubbers has not been fully clear to now.…”

Section: Introductionmentioning

confidence: 99%

Structure of natural rubber/emulsion butadiene rubber (NR/EBR) vulcanizates

Jurkowska

Ol’khov

Jurkowski

2000

J. Appl. Polym. Sci.

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Diblock amorphous topological structure of a filled vulcanizate network made of natural rubber (NR) and Emulsion Butadiene Rubber (EBR) was found. These blocks differ in the transition temperatures about 200°C. Dual transitions of such rubbers have been assigned as a motion of the mixed soft block [low glass transition temperature (Tg )] in the glassy state and the motion in elements of a network around physical and chemical crosslinking sites in a rigid block (high Tg ), respectively. Compaction of the topological structure of a high‐temperature block during curing (manifested by the growth of Tg ) was noticed. The molecular weight distribution of the chains between the junctions of the network and shares of these amorphous blocks in the structure of the rubber network vs curing time were calculated using the methodology shown. Introduction of Perkalink 900 at constant quantity of sulfur changes a structure of the junctions in the tested rubber network from mixed (10–15% of chemical bonds, and remaining are cluster type and topological junctions) into practically all chemical bonds. Optimal curing time evaluated by the thermomechanical analysis, at which molecular structures formed in both blocks reflect the equilibrium state of adsorption layers of two rubbers introduced into the compound, is close to that evaluated by the vulcametric tests. The location of the molecular weight distribution curve in both blocks one against another depends on rubber formulation. Also, a fact that crosslinks are gathered, as was predicted by Vilgis and Heinrich calculations, was confirmed experimentally. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 732–742, 2000

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Studies on a New Antireversion Agent for Sulfur Vulcanization of Diene Rubbers

Cited by 24 publications

References 0 publications

Vulcanization of polybutadiene rubber with dipentamethylene thiuram tetrasulfide

Vulcanization of polybutadiene rubber with dipentamethylene thiuram tetrasulfide

Effect of the temperature on the kinetic of natural rubber vulcanization with the sulfur donor agent dipentamethylene thiuram tetrasulphide

Structure of natural rubber/emulsion butadiene rubber (NR/EBR) vulcanizates

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