Dynamic mechanical analysis and tribological properties of NR vulcanizates with fly ash/precipitated silica hybrid filler

Thongsang, S.; Vorakhan, Weeraya; Wimolmala, Ekachai; Sombatsompop, Narongrit

doi:10.1016/j.triboint.2012.04.006

Cited by 55 publications

(39 citation statements)

References 37 publications

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“…Several researchers have observed the significant changes in the mechanical properties like storage and loss moduli and Tan of polymers reinforced with fibers and particulate fillers [5][6][7][8][9][10]. Jin et al [5] conducted the study on dynamic 2 Advances in Tribology mechanical analysis (DMA) of multiprocessed multiwalled carbon nanotube/polymethylmethacrylate (PMMA) composites to determine storage and loss moduli and Tan .…”

Section: Introductionmentioning

confidence: 99%

“…However, higher oMMT filler addition has shown minimum wear volume loss and improved mechanical properties. Thongsang et al [9] studied the dynamic mechanical and tribological properties of fly ash silica (FASi)/precipitated silica (PSi) filled natural rubber (NR) composites by varying the total silica contents in hybrid NR composites. They concluded that a 75% PSi fraction to be introduced into FASi/PSi-filled NR compounds in order to achieve optimal mechanical properties and wear resistance.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Mechanical Analysis and Three-Body Abrasive Wear Behaviour of Thermoplastic Copolyester Elastomer Composites

Hemanth

Sekar

Pallathadka

2014

Advances in Tribology

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Various amounts of short fibers (glass and carbon) and particulate fillers like polytetrafluoroethylene (PTFE), silicon carbide (SiC), and alumina (Al 2 O 3 ) were systematically introduced into the thermoplastic copolyester elastomer (TCE) matrix for reinforcement purpose. The mechanical properties such as storage modulus, loss modulus, and Tan by dynamic mechanical analysis (DMA) and three-body abrasive wear performance on a dry sand rubber wheel abrasion tester have been investigated. For abrasive wear study, the experiments were planned according to 27 orthogonal array by considering three factors and three levels. The complex moduli for TCE hybrid composites were pushed to a higher level relative to the TCE filled PTFE composite. At lower temperatures (in the glassy region), the storage modulus increases with increase in wt.% of reinforcement (fiber + fillers) and the value is maximum for the composite with 40 wt.% reinforcement. The loss modulus and damping peaks were also found to be higher by the incorporation of SiC and Al 2 O 3 microfillers. The routine abrasive wear test results indicated that TCE filled PTFE composite exhibited better abrasion resistance. Improvements in the abrasion resistance, however, have not been achieved by short-fiber and particlaute filler reinforcements. From the Taguchi's experimental findings, optimal combination of control factors were obtained for minimum wear volume and also predictive correlations were proposed. Further, the worn surface morphology of the samples was discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Analysis and Three-Body Abrasive Wear Behaviour of Thermoplastic Copolyester Elastomer Composites

Hemanth

Sekar

Pallathadka

2014

Advances in Tribology

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“…At some critical temperature, the storage modulus decreases rapidly and the sample changes from a glassy to a rubbery state (Fig.4(a)). The observed behaviors fall into two groups: (1) [18] Moreover, comparing the rubber types with the mixed filler SiO 2 +MgCO 3 , the T g was higher in ENR50 than in STR5L because the polar ENR better interacts with the mixed filler [19]. …”

Section: Dynamic Mechanical Propertiesmentioning

confidence: 99%

Optimizing the Properties of Vulcanized Compounds for Foodstuff Conveyor Belts in Industrial Microwave Per-Heating

Limhengha¹

2018

GEOMATE

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This research finds a natural rubber-based material with good dielectric properties and low cost for a foodstuff conveyor belt (FCB) that can be heated with microwaves. For this purpose, epoxidized natural rubber-50 (ENR50) and standard Thai rubber 5L (STR5L) were mixed with a filler mixture of silica and magnesium carbonate. The FCB compound with filler (FCBcF) yielding the best vulcanization time, and the best mechanical, dielectric and dynamic properties, was selected for further study. The optimal FCBcF, ENR50:SiO 2 :MgCO 3 (100:40:40) with microwave pre-heating at 2.45 GHz and 340 W for one minute before vulcanization, was well cross-linked and strongly converted the microwaves to heat. FCBcF also showed satisfactory mechanical properties with reduced cost of raw materials and reduced the curing time by 50% per round. The results demonstrate that pre-heating of FCBcF prior to vulcanization reduces the time and cost of fabricating FCBs, providing long-term economic and environmental benefits.

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“…This may have prevented the crosslinking reaction by sulfur in the NR compounds (Ooi et al 2013b;Tangudom et al 2014;Thongsang et al 2012). As a result, the torque difference and crosslink density were lower.…”

Section: Fig 2 Scorch Time and Cure Time Of The Nr Vulcanizates Asmentioning

confidence: 99%

Purification and Characterization of Silica from Sugarcane Bagasse Ash as a Reinforcing Filler in Natural Rubber Composites

et al. 2017

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This work studied the chemical composition, cure characteristics, and morphological and mechanical properties of natural rubber (NR) compounds filled with silica, which was derived from bagasse ash (BA). The BA filler underwent various preparation processes (untreated, hydrochloric acid (HCl)-treated, and HCl/ammonium fluoride (HCl/NH4F) extracted). The results revealed that the main functional group of the BA was silica. After purification by HCl and HCl/NH4F, the silica content increased from 77.2% to 90.6% and 97.0%, respectively. Longer cure times and lower crosslinking were obtained after purifying the silica. Treatment of silica with HCl/NH4F improved the tensile strength and compression set when added at 15 parts per hundred rubber (phr) loading. Purification with HCl and HCl/NH4F acted as an obstacle to rubber-rubber crosslinking, but helped to moderate the filler-filler interaction. The elongation range for the NR containing the BA silica in this work was 900% to 1,100%. The use of HCl/NH4F-extracted silica in NR vulcanizates had no effect on the lightness, while the untreated and HCl-treated silica displayed decreased lightness. The silica from BA is recommended for use as reinforcing filler in NR compounds if treated with HCl followed by NH4F extraction before use. The optimal loading of the treated silica was 15 phr.

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Dynamic mechanical analysis and tribological properties of NR vulcanizates with fly ash/precipitated silica hybrid filler

Cited by 55 publications

References 37 publications

Dynamic Mechanical Analysis and Three-Body Abrasive Wear Behaviour of Thermoplastic Copolyester Elastomer Composites

Dynamic Mechanical Analysis and Three-Body Abrasive Wear Behaviour of Thermoplastic Copolyester Elastomer Composites

Optimizing the Properties of Vulcanized Compounds for Foodstuff Conveyor Belts in Industrial Microwave Per-Heating

Purification and Characterization of Silica from Sugarcane Bagasse Ash as a Reinforcing Filler in Natural Rubber Composites

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