Mooney scorch time of epoxidized natural rubber

Poh, B. T.; Tan, Bin

doi:10.1002/app.1991.070420525

Cited by 60 publications

(33 citation statements)

References 12 publications

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“…Furthermore, the increased thermal conductivity of rubber compounds by the addition of CB [17–19] and the reactive organic groups (such as phenolic, hydroxyl, quinone, carboxyl) and reactive hydrogen bonds, as well as free radicals on the surface of CB, can also react chemically with the rubber molecules [13, 16], which has the potential to promote the kinetics of the crosslinking reaction. This phenomenon was also identified by previous studies [20–25]. On the other hand, the rubber compound filled with SiO 2 has an increase in t 90 .…”

Section: Resultssupporting

confidence: 86%

“…This is attributed to the greater amount of accelerators (with respect to sulfur), which leads to a more effective use of the sulfur as to attain a satisfactory degree of cure [16]. It is also found that the t scorch and t 90 particularly decrease with increased cure temperatures, as a consequence of the available thermal energy to overcome the activation energy of the cure process [20], while the increase of temperature does not bring about any major changes in the minimum torque or stock viscosity of the compounds. As indicated in literatures [13, 16, 21–23], the torque difference (Δ M ) generally relates to the degree of crosslinking; the rubber compound vulcanized by the CV system is found to be much higher than that of the EV system.…”

Section: Resultsmentioning

confidence: 99%

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Effects of filler contents and processing parameters on the weldline strength of compression molded natural rubber

Patcharaphun¹,

Chookaew²,

Tungkeunkunt³

et al. 2011

Polymer Engineering & Sci

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The presence of weldlines in rubber products is regarded as a one of the most undesirable phenomena, since it results in poor mechanical properties. Compression molding of large or complicated products are prepared by multiple charges, which produces weldlines once the melt fronts are joined by the impingement flow. In this work, the effects of curing systems, processing parameters, filler types, and contents on weldline strength of compression molded natural rubber (NR) were investigated. Furthermore, the effects of curing systems on the aging properties of NR vulcanizates were studied in details. The results show that an increased amount of calcium carbonate does not affect the weldline strength. However, the difference in tensile strength between weldline and nonweldline specimens becomes larger with the high loading of silica and carbon black. In addition, for the factors selected in the experiments, clamping pressure, and curing system were found to be the principal factors affecting the weldline property of vulcanizates. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Effects of filler contents and processing parameters on the weldline strength of compression molded natural rubber

Patcharaphun¹,

Chookaew²,

Tungkeunkunt³

et al. 2011

Polymer Engineering & Sci

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“…Technical specification of the ENR 25 was given in our previous report. 8 Zinc oxide, coumarone-indene resin, and toluene were used as the filler, tackifier, and solvent, respectively, in this research. All the materials used in this experiment were freshly supplied commercial grades.…”

Section: Experimental Materialsmentioning

confidence: 99%

Effect of zinc oxide on the viscosity, tack, and peel strength of ENR 25‐based pressure‐sensitive adhesives

Poh

Chow

2007

J of Applied Polymer Sci

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Viscosity, loop tack, and peel strength of epoxidized natural rubber (ENR 25 grade)-based pressure-sensitive adhesive was studied in the presence of zinc oxide. The zinc oxide concentration was varied from 10-50 parts per hundred parts of rubber (phr). Coumarone-indene resin with loading from 20 to 100 phr was chosen as the tackifier resin. Toluene was used as the solvent throughout the experiment. The adhesive was coated on the substrate using a SHEEN hand coater to give a coating thickness of 60 mm. Viscosity of the adhesive was determined by a HAAKE Rotary Viscometer whereas the loop tack and peel strength were measured by a Llyod Adhesion Tester operating at 30 cm/min. Results show that viscosity and loop tack of adhesive increases with increasing zinc oxide concentration. For the peel strength, it increases with zinc oxide concentration up to 30-40 phr and drops after the maximum value. This observation is associated with the effect of varying degree of wettability of the adhesive on the substrate. However, for a fixed zinc oxide concentration, loop tack and peel strength exhibit maximum value at 80 phr resin loading after which both properties decrease with further addition of resin, an observation which is attributed to phase inversion. From this study, the optimum adhesion property is achieved by using 40 phr zinc oxide and 80 phr coumarone-indene resin.

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“…It can be seen that for a similar type of filler, the t 90 of SMR L/ENR 25 blends is shorter than that of SMR L/SBR blends. We have reported15 that, due to the activation of the adjacent double bond by the epoxide group in ENR, the scorch time and cure time are shorter than that of SMR L. However, SBR, which has fewer double bonds, as discussed before, cures more slowly than SMR L and thus the t 90 of SMR L/ENR 25 blends is shorter than that of SMR L/SBR blends.…”

Section: Resultsmentioning

confidence: 83%

Effect of filler loading on cure time and swelling behaviour of SMR L/ENR 25 and SMR L/SBR blends

Ismail

Poh

Tan

et al. 2003

Polymer International

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The effect of filler loading on the cure time (t90) and swelling behaviour of SMR L/ENR 25 and SMR L/SBR blends has been studied. Carbon black (N330), silica (Vulcasil C) and calcium carbonate were used as fillers and the loading range was from 0 to 40 phr. Results show that for SMR L/ENR 25 blends the cure time decreases with increasing carbon black loading, whereas silica shows an increasing trend, and calcium carbonate does not show significant changes. For SMR L/SBR blends, the cure time of carbon black, silica and calcium carbonate generally decreases with increasing filler loading. The percentage swelling in toluene and ASTM oil no 3 decreases for both blends with increasing filler loading, with calcium carbonate giving the highest value, followed by silica‐ and carbon black‐filled blends. At a fixed filler loading, SMR L/ENR 25 blend shows a lower percentage swelling than SMR L/SBR blends. © 2003 Society of Chemical Industry

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Mooney scorch time of epoxidized natural rubber

Cited by 60 publications

References 12 publications

Effects of filler contents and processing parameters on the weldline strength of compression molded natural rubber

Effects of filler contents and processing parameters on the weldline strength of compression molded natural rubber

Effect of zinc oxide on the viscosity, tack, and peel strength of ENR 25‐based pressure‐sensitive adhesives

Effect of filler loading on cure time and swelling behaviour of SMR L/ENR 25 and SMR L/SBR blends

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