The influence of CB loading on thermal aging resistance of SBR and NBR rubber compounds under different aging temperature

2009 ◽  
Vol 30 (3) ◽  
pp. 791-795 ◽  
Author(s):  
A. Mostafa ◽  
A. Abouel-Kasem ◽  
M.R. Bayoumi ◽  
M.G. El-Sebaie
Keyword(s):  
Thermal Aging ◽  
Aging Temperature ◽  
Rubber Compounds ◽  
Aging Resistance

scholarly journals Study on the Structure and Dielectric Properties of Zeolite/LDPE Nanocomposite under Thermal Aging

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2108
Author(s):  
Bai Han ◽  
Chuqi Yin ◽  
Jiaxin Chang ◽  
Yu Pang ◽  
Penghao Lv ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Aging Time ◽  
Thermal Aging ◽  
Aging Treatment ◽  
Dielectric Strength ◽  
Breakdown Field ◽  
Scanning Calorimetry ◽  
Aging Resistance ◽  
The Stability ◽  
Breakdown Field Strength

Nanodoping is an effective way to improve the dielectric properties and the aging resistance of polyethylene. Nano-zeolite has a nano-level porous structure and larger specific surface area than ordinary nano-inorganic oxide, which can be used to improve dielectric properties of low-density polyethylene (LDPE) nanocomposite. The zeolite/LDPE nanocomposites were prepared and subjected to thermal aging treatment to obtain samples with different aging time. Using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and the differential scanning calorimetry (DSC) test to study the microscopic and structure characteristics, it was found that nano-zeolite doping can effectively reduce the thermal aging damage to the internal structure of the nanocomposite; carbonyl and hydroxyl decreased significantly during the thermal aging time, and the crystallinity effectively improved. Nano-zeolite doping significantly improved the morphology and strengthened the aging resistance of the nanocomposite. In the dielectric strength test, it was found that nanodoping can effectively improve the direct current (DC) and alternating current (AC) breakdown field strength and the stability after the thermal aging. The dielectric constant of nanocomposite can be reduced, and the dielectric loss had no obvious change during the aging process. Moreover, the zeolite/LDPE nanocomposite with the doping concentration of 1 wt % had the best performance, for the nano-zeolite was better dispersed.

Polymer modified-natural bitumen thermal aging resistance studies

2017 ◽  
Vol 20 (10) ◽  
pp. 1207-1215 ◽  
Author(s):  
Ojeyemi M. Olabemiwo ◽  
Akintomiwa O. Esan ◽  
Hassan O. Bakare ◽  
Foluso O. Agunbiade
Keyword(s):  
Thermal Aging ◽  
Natural Bitumen ◽  
Aging Resistance

Thermal Aging Effect on the Ratcheting Behavior of Pressurized Elbow Pipe

2018 ◽  
Vol 140 (2) ◽  
Author(s):  
Caiming Liu ◽  
Dunji Yu ◽  
Waseem Akram ◽  
Xu Chen
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Aging Time ◽  
Thermal Aging ◽  
Aging Temperature ◽  
Aging Process ◽  
Kinematic Hardening ◽  
Aging Effect ◽  
Hardening Model ◽  
User Subroutine

In this study, the ratcheting behaviors of pressurized Z2CN18.10 austenitic stainless steel elbow pipe influenced by the thermal aging process were experimentally investigated in controlled constant internal pressure and reversed in-plane bending after different thermal aging periods (1000 h and 2000 h) at thermal aging temperature of 500 °C. It is shown that the ratcheting behavior of pressured elbow pipe is highly affected by the thermal aging process. The evaluation of ratcheting behavior of pressured elbow pipe was performed using Chen–Jiao–Kim (CJK) kinematic hardening model as a user subroutine of ANSYS. The relationships of yield stress σs and multiaxial parameter χ with thermal aging time were proposed. Ratcheting shakedown boundary of aged elbow pipe was evaluated by CJK model with thermal aging time.

Effect of Carbon Black Substitution with Raw and Modified Bentonite on the Thermal Aging Resistance of Natural Rubber Composites

2016 ◽  
Vol 705 ◽  
pp. 8-13 ◽  
Author(s):  
Clare L. Garing ◽  
Bryan B. Pajarito
Keyword(s):  
Carbon Black ◽  
Natural Rubber ◽  
Tensile Properties ◽  
Thermal Aging ◽  
Clay Platelet ◽  
Aging Resistance ◽  
Contour Plots ◽  
Activated Bentonite ◽  
Simplex Lattice ◽  
Simplex Lattice Mixture Design

The effect of carbon black (CB) substitution with raw (BNT) and modified (M-BNT) bentonite on the thermal aging resistance of natural rubber (NR) composites was investigated in this study. NR composites were prepared at varied proportions of CB, M-BNT, and BNT using a three-component, third degree simplex lattice mixture design of experiment (DOE). M-BNT was produced by modifying sodium-activated bentonite with tetradecyldimethylamine (TDA) salt and cocamide diethanolamine (CDEA). Thermal aging was performed at 70 and 100°C for 168 and 336 h. Substitution of CB with 5 phr M-BNT gave the highest values of tensile properties (modulus and strength) for both unaged and aged samples. This is attributed to the synergistic effect of CB and M-BNT fillers on the tensile properties of NR composites. In terms of property retention (%), composites filled with M-BNT and BNT clay fillers attained the highest values which signified their excellent thermal aging resistance. This observation proves the barrier effect of clay platelet structure which hinders oxygen diffusion in the rubber. Reduced hierarchical models as function of CB, M-BNT, and BNT proportions were used to generate contour plots for tensile properties of NR composites after 168 h of aging at 70 and 100°C.

Physical aging and thermal aging resistance of polycarbonate/poly(styrene-b-(ethylene-co-butylene)-b-styrene) blends

2012 ◽  
Vol 52 (9) ◽  
pp. 1958-1963 ◽  
Author(s):  
Shuta Suzuki ◽  
Shotaro Nishitsuji ◽  
Takashi Inoue
Keyword(s):  
Thermal Aging ◽  
Physical Aging ◽  
Aging Resistance

Influence of filler and cure systems on thermal aging resistance of natural rubber vulcanizates under strained condition

2010 ◽  
Vol 118 (5) ◽  
pp. 3074-3081 ◽  
Author(s):  
Sung-Seen Choi ◽  
Jobin Jose ◽  
Min-Young Lyu ◽  
Yang-Il Huh ◽  
Baik Hwan Cho ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Thermal Aging ◽  
Strained Condition ◽  
Aging Resistance ◽  
Natural Rubber Vulcanizates

Rate of Cure of Reclaimed Rubber—II

1930 ◽  
Vol 3 (2) ◽  
pp. 315-327
Author(s):  
F. L. Kilboura ◽  
G. W. Miller
Keyword(s):  
Physical Properties ◽  
Sodium Hydroxide ◽  
Rapid Rate ◽  
Oven Test ◽  
Rubber Compounds ◽  
Aging Resistance

Abstract Residual alkali in reclaim is chiefly responsible for the faster rate of cure of stocks containing reclaimed rubber as compared with those containing new rubber only. Reclaim prepared in water can be made to cure as fast as alkali reclaim by the addition of sodium hydroxide to the extent that this is present in the alkali reclaim. The determination of residual alkali requires a very long extraction, in this case approximately 60 days. Of five possible theories accounting for the rapid rate of cure of reclaim, only that of residual alkali is tenable. There still remains in certain cases, however, a difference in rate of cure between stocks containing new rubber and those containing water-cooked reclaim for which no explanation has been found. Sodium hydroxide of itself is not deleterious to rubber compounds, for, in addition to its value as an accelerator in certain cases, it tends to improve physical properties and aging resistance, as judged by the Geer oven test.

EPDM/SBR Blends for Skim Compound of Steel Cord Conveyor Belt: Mechanical Properties, Thermal Stability and Adhesion Level

2021 ◽  
Vol 889 ◽  
pp. 135-143
Author(s):  
Nguyen Thanh Liem ◽  
Nguyen Pham Duy Linh ◽  
Nguyen Huy Tung ◽  
Bach Trong Phuc
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Thermal Aging ◽  
Conveyor Belt ◽  
Elongation At Break ◽  
Pull Out ◽  
Rubber Compounds ◽  
Aging Properties ◽  
Steel Cord ◽  
Adhesion Level

In this paper, the influence of some ingredient concentrations such as SBR ratio, DCP/S, CBS/DPG accelerator, EPDM-g-AM and cord surface on mechanical, thermal aging properties and adhesion between rubber compounds and cord have been investigated. The results showed that with suitable ingredients loading such as EPDM/SBR is 85/15 phr, DCP/S is 2.0/1.5 phr and EPDM-g-AM content is 2.0 phr with respect to rubber, the vulcanizates had good mechanical properties, thermal stability and adhesion level to the zinc/copper galvanized cord. The highest tensile strength, elongation at break and pull out strength reached 18.1 MPa, 432% and 60.3 N/mm respectively, and the highest retention after thermal aging at 150°C for 168 hours was about 0.76.

Ratcheting Behavior of Pressurized Elbow Pipe After Thermal Aging

2018 ◽  
Author(s):  
Caiming Liu ◽  
Dunji Yu ◽  
Xu Chen
Keyword(s):  
Internal Pressure ◽  
Thermal Aging ◽  
Aging Temperature ◽  
Kinematic Hardening ◽  
Hardening Model ◽  
Aging Period ◽  
Plane Bending

In the present work, the effect of thermal aging on ratcheting behaviors of three pressurized elbow pipes after different thermal aging periods was experimentally studied under constant internal pressure and reversed in-plane bending. The elbow pipes were thermal aged for 1000 h and 2000 h at the same aging temperature of 500 centigrade degrees. It is indicated that thermal aging period has a significant effect on elbow pipe’s ratcheting deformation. Chen-Jiao-Kim (CJK) kinematic hardening model was employed to evaluate the ratcheting behaviors of pressured elbow pipes affected by thermal aging.

A Proposed New Method of Retarding the Aging of Vulcanized Rubber by Means of Peroxides and Nitro Compounds

1939 ◽  
Vol 12 (2) ◽  
pp. 292-297
Author(s):  
S. Minatoya ◽  
T. Ando^
Keyword(s):  
Successful Aging ◽  
Mechanical Tests ◽  
Control Effect ◽  
Mineral Oils ◽  
Vulcanized Rubber ◽  
Rubber Compounds ◽  
Aging Resistance ◽  
Before And After ◽  
The Stability ◽  
Low Sulfur

Abstract (1) Considering that low-sulfur vulcanization gives high resistance to aging, because vulcanization does not go beyond the primary stage, it has been sought to effect this control in stocks accelerated with diphenylguanidine. m-Dinitrobenzene has been selected from a number of possible agents as a reliable controller; other agents which retard vulcanization and have weak control effect or active oxidizing effect were rejected. (2) From a comparison of m-dinitrobenzene and aldol-α-naphthylamine in diphenylguanidine stocks, successful aging resistance has been observed. Mechanical tests were carried out before and after bomb aging, and chemical analyses were made of the vulcanized rubbers to throw light on the vulcanization mechanism and the reasons for improved resistance to aging. (3) Parallel experiments with other accelerators failed to reveal improved aging resistance, and in the presence of mercaptobenzothiazole in particular, m-dinitrobenzene acts as an oxidizing agent. (4) Tests of the stability of m-dinitrobenzene, alone and when mixed with various reagents, by the Abel test for stability of explosives have shown that the stability depends on the purity of the compound. Diphenylguanidine is effective as a stabilizer of m-dinitrobenzene, while other accelerators act as decomposers, thus providing a reason for the age resistance observed with diphenylguanidine. As a result of the stability tests, it has been found that various amines, soaps and mineral oils are effective as stabilizers of m-dinitrobenzene. As an instance of their application, aging tests have been carried out on rubber compounds accelerated with mercaptobenzothiazole and containing m-dinitrobenzene stabilized with diphenylamine. It has been found that the age resistance is much improved and is comparable with that obtained in the presence of aldol-α-naphthylamine.

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