Effects of lanthanum complex on the thermo-oxidative aging of natural rubber

Wang, Zheng; Liu, Li; Zhao, Xiuying; He, Jingwei; Wang, Ao; Chan, Tung W.; Wu, Sizhu

doi:10.1016/j.polymdegradstab.2015.07.024

Cited by 63 publications

(34 citation statements)

References 18 publications

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“…It can be seen that the DTG curves show two peaks, indicating that the thermo-oxidative degradation reaction in the air atmosphere can be considered as a two-step reaction. The first step is the decomposition of rubber chain and the second step is the further decomposition of aging products (Zheng et al, 2015). The values of DTG peaks increase with the increase of heating rate and DTG peaks tends to shift to a higher temperature (Table 1).…”

Section: Results and Discussion Thermogravimetric Analysismentioning

confidence: 99%

“…Zhao et al (2013) analyzed the degradation kinetics of phenol-formaldehyde resins derived from beetle infested pine barks by using Kissinger and Kissinger-Akahira-Sunose methods. Zheng et al (2015) used the isoconversional Flynn-Wall-Ozawa (FWO) method to calculate the kinetic paramesters of degradation of natural rubber (NR). Nabil et al (2013) applied the Coats--Redfern's method to study thermal analysis of carbon black-filled NR/Virgin EPDM and NR/Recycled EPDM rubber blends.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic studies on thermal degradation of natural rubber/butyl rubber

Sholeh¹,

Indrajati²,

Yuniari³

2018

MKKP

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The knowledge of how rubber breakdown on heating in oxidative environment is important in processing and using the material. In this work, thermogravimetric analysis were carried out and three iso-conversional kinetic models were utilized to get apparent activation energies of thermal degradation of natural rubber (NR)/butyl rubber (IIR). Blending of NR/IIR and additives was conducted using a laboratory two-roll mill. Thermal degradation of the blends and its kinetic parameters were analysed using thermo gravimetric analysis (TGA) with heating rates of 5, 10, 15, and 20°C/min. The kinetic parameters were determined by three isoconversional models (Kissinger, Doyle, and Flynn-Wall-Ozawa (FWO) model). The result revealed that the thermal decomposition of the blend occurs in two stages and the derivative thermogravimetric (DTG) peaks tends to shift to a higher temperature during TGA measurement. The values of DTG peaks increases with an increase of the heating rate, and the three iso-conversional models gave similar apparent activation energies. The activation energy obtained can be used to predict thermal lifetime of the material.

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Section: Results and Discussion Thermogravimetric Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetic studies on thermal degradation of natural rubber/butyl rubber

Sholeh¹,

Indrajati²,

Yuniari³

2018

MKKP

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“…9,10 Graphene (GE) and its relatives (e.g., graphene oxide and graphene nanoribbons) are promising candidates as fillers in NBR-based nanocomposites with the range of unique properties of these materials, such as high specific surface area, high thermal and electrical conductivity, mechanical strength and flexibility, among many others. [11][12][13] In fact, the process of rubber ageing is very slow, and takes a long time to degrade. Thus, accelerated ageing tests are typically applied in the study of rubber degradation in a short time.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Ageing Behaviour of Nitrile-Butadiene Rubber with Added Graphene in an Accelerated Thermal Ageing Environment

Gao

Guo

2018

Kem. Ind.

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In this paper, the thermal ageing of nitrile-butadiene rubber (NBR) reinforced with different graphene (GE) concentrations has been investigated. NBR and NBR-GE composites were exposed to an accelerated thermal ageing environment produced by an air-circulating oven for seven days. The mechanical properties, chemical changes, and thermal stability of ageing samples and neat samples were evaluated. The results showed that the surface damage of NBR was severe and inhomogeneous, and the degree of ageing was most serious on the edge region of the voids, but NBR-GE composites were changed slightly before and after ageing. The tensile strength increased with the increase of GE concentration, up to a maximum value, and decreased with further increases in GE concentration. The GE embedded crosslinked network limited the segment movement of chains in the stretch direction and played a role in the composites properties, and the GE sheets (contained the functional groups of −OH, −C=O and C=C) after ageing. This behaviour may indicate greater interface adhesion between the GE and NBR. In addition, results obtained by thermogravimetric analysis (TGA) indicated that the thermal stability of NBR significantly changed with accelerated thermal ageing environment, but with addition of a certain amount of GE to NBR, the thermal stability of NBR could be improved. The NBR/GE composites exhibited good comprehensive performance with a mass fraction of GE of 10 %. Before and after the thermal ageing, the failure mechanism of NBR-GE composites appeared intergranular and ductile fracture, respectively.

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Section: Introductionmentioning

confidence: 99%

“…Recent studies have found that coordination compounds composed of rare earth metals and certain organic compounds containing O, S and N atoms could exert excellent long-term protective effect on the thermal oxidation process of rubbers [3,4]. The thermal-oxidative aging of NR follows an autocatalytic, free radical chain reaction mechanism [3]. With shell structure like 4f0-145d0-106s2, lanthanide series rare earth ions, whose atom numbers are from 57 to 71, have long atom radius and a large quantity of unoccupied orbits, resulting in strong abilities in scavenging free radicals generated in the thermal-oxidative process [5].…”

Section: Introductionmentioning

confidence: 99%

The Antioxidant Effect of Lanthanum Complex in Natural Rubber

Li¹,

Zheng²,

Wu³

2016

Proceedings of the 3rd International Conference on Material Engineering and Application (ICMEA 2016)

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Mixed antioxidants composed of antioxidant N-phenyl-N'-isopropyl-p-phenylenediamine (IPPD) and lanthanum (La) complex were added as a filler to prepare natural rubber (NR) composites. By mechanical testing, X-ray photoelectron spectroscopy, and thermogravimetric analysis, a string of data, including the mechanical properties, the variation of chemical surface characterization, and the thermo-oxidative decomposition kinetics parameters, was presented in this article to study the antioxidant effect of the mixed antioxidants in NR. The density function theoretical calculations were also used as an assistant to study the thermo-oxidative aging mechanism of NR and the different function mechanisms of antioxidants IPPD and La complex. The data revealed that except for functioning as a labile-hydrogen doner which was similar to antioxidant IPPD, this La complex had strong coordination abilities and large coordination numbers, resulting in the high efficiency in enhancing the thermal-oxidative stability of NR.

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Effects of lanthanum complex on the thermo-oxidative aging of natural rubber

Cited by 63 publications

References 18 publications

Kinetic studies on thermal degradation of natural rubber/butyl rubber

Kinetic studies on thermal degradation of natural rubber/butyl rubber

Investigation of Ageing Behaviour of Nitrile-Butadiene Rubber with Added Graphene in an Accelerated Thermal Ageing Environment

The Antioxidant Effect of Lanthanum Complex in Natural Rubber

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