Thermal stability and ageing properties of sulphur and gamma radiation vulcanized natural rubber (NR) and carboxylated styrene butadiene rubber (XSBR) latices and their blends

Stephen, Ranimol; Jose, Seno; Joseph, Kuruvilla; Thomas, Sabu; Oommen, Zachariah

doi:10.1016/j.polymdegradstab.2005.12.001

Cited by 54 publications

(45 citation statements)

References 16 publications

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“…[12,13] The density of the vulcanizates was measured on MDMDY-350 densitometer (Zhongshan Meidi Analytic Instrument Factory, China). The samples were cut into rectangles (10 Â 10 Â 2 mm 3 ) and weighed before and after being soaked in toluene for 72 h which ensured a swelling equilibrium.…”

Section: Measurement Of Crosslink Densitymentioning

confidence: 99%

Dispersion and Exfoliation of Graphene in Rubber by an Ultrasonically‐Assisted Latex Mixing and In situ Reduction Process

Zhan

Xia

et al. 2011

Macro Materials & Eng

242

177

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NR/GE composites were prepared by an ultrasonically‐assisted latex mixing and in situ reduction process. Graphene oxide was dispersed in NRL using an ultrasonic field and was then reduced in situ, followed by latex coagulation to obtain the NR/GE masterbatch. The results show that the process produces a much better dispersion and exfoliation of GE in the matrix and contributes to an increase in the tensile strength compared to conventional direct mixing. Compared to pure rubber, the tensile strength and tear strength for NR/(2 wt.‐%)GE composites were increased by ≈47 and 50%, respectively. With increasing GE content, the maximum torque, crosslink density, elastic modulus, and thermal conductivity of NR/GE composites were found to increase. magnified image

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Section: Measurement Of Crosslink Densitymentioning

confidence: 99%

Dispersion and Exfoliation of Graphene in Rubber by an Ultrasonically‐Assisted Latex Mixing and In situ Reduction Process

Zhan

Xia

et al. 2011

Macro Materials & Eng

242

177

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“…Nota-se que a amostra LN apresenta 6,3% na primeira perda de massa, enquanto que a amostra MT teve perda de 15,6%, que podem corresponder a volatilização de plastificantes, óleos e outros componentes de menor peso molecular [17][18][19] . A segunda perda de massa corresponde a pirólise do polímero.…”

Section: Resultsunclassified

Avaliação de compostos de borracha natural utilizados em equipamentos de segurança

et al. 2010

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Resumo:No setor elétrico, a borracha natural (BN) tem sido amplamente utilizada na confecção de ferramentas isolantes. Esses são itens essenciais para a segurança e proteção de trabalhadores da área de manutenção de redes de distribuição de energia elétrica. A boa conservação dessas ferramentas deve ser assegurada com o objetivo de garantir o isolamento elétrico e resistência mecânica adequados, portanto a avaliação dos processos de degradação se torna importante. Neste trabalho duas formulações de borracha natural comerciais, utilizadas na confecção de equipamentos de proteção coletiva (EPC´s), foram caracterizadas por envelhecimento térmico, ensaios mecânicos, termogravimétricos, análise termo-dinâmico mecânica, inchamento e extração. Palavras-chave: Borracha natural, inchamento, envelhecimento, propriedades mecânicas. Evaluation of Natural Rubber Compounds Used in Line-Life EquipmentAbstract: Electrical engineering sector make use of natural rubber to manufacture line-life equipment, utilized to promote safety and protection for those who work in the electrical networks maintenance. A good conservation of the equipment must be assured in order to guarantee the necessary insulation. Thus, the assessment of the degradation processes becomes important. In this study two commercial types of natural rubber commonly employed to produce collective protective equipment (CPE), were evaluated using artificial thermal ageing through mechanical, swelling tests, thermogravimetric analysis, dynamic mechanical thermal analysis and solvent extraction. Keywords: Natural rubber, swelling, ageing, mechanical properties. IntroduçãoA manutenção em redes de distribuição de energia elétrica energizadas, chamadas de linha viva, exige o uso de equipamentos de segurança como lençóis, mantas, luvas e outros [1,2] . Os materiais utilizados na confecção desses equipamentos devem possuir excelentes características de isolamento elétrico e características mecânicas, que devem ser mantidas durante todo período de utilização, para garantir a segurança dos profissionais envolvidos em atividades com eletricidade.Um dos polímeros usados na confecção dessas ferramentas é a borracha natural (BN) devido sua excelente propriedade de isolamento elétrico e resistência mecânica. Esses equipamentos de segurança podem ser produzidos em diferentes classes de isolamento, dependendo da espessura da peça, a menor classe é de 500 V e a maior é de 40.000 V [1] .As ferramentas de proteção apresentam diferentes propriedades entre si, devido à formulação e ao processo de fabricação. A forma de armazenamento, o tempo de uso e a exposição ao meio ambiente provocam a degradação da BN, alterando as propriedades isolantes e mecânicas [3,4] . Uma forma de avaliar as condições limite dessas ferramentas é através do envelhecimento térmico, procurando simular de forma acelerada as condições de uso [5] .A degradação térmica em polímeros envolve a concorrência entre dois processos: a quebra de ligações da cadeia polimérica e a formação de ligações entrecruzadas [3,[6][7][8...

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“…The mechanical properties of rubber, however, are sensitive to environmental conditions. A degrading environment, such as one characterized by high temperature, high humidity, strong light, or a mechanical load, will degrade the mechanical properties of rubber [1][2][3][4][5][6][7][8]. South had evaluated the thermal degradation of ultimate stress and strain, Young's modulus, and crack growth behavior for natural rubber (NR) according to the percentage of polysulfidic crosslinks [1].…”

Section: Introductionmentioning

confidence: 99%

“…Nair et al had studied the mechanical properties of thermal aged FKM/EPDM blends and had investigated the thermal stability of them by using TGA and DSC [3]. Stephen et al had studied the thermal stability of NR, XSBR, and their blends with TGA, and the thermal degradation of tensile strength had been estimated for the sulfur and radiation-vulcanized samples [4]. Woo and Park had estimated the thermal aging of compression deformation for NBR and EPDM by using Arrhenius plot [5].…”

Section: Introductionmentioning

confidence: 99%

Thermal degradation of chlorosulfonated polyethylene rubber and ethylene propylene diene terpolymer

et al. 2012

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Thermal stability and ageing properties of sulphur and gamma radiation vulcanized natural rubber (NR) and carboxylated styrene butadiene rubber (XSBR) latices and their blends

Cited by 54 publications

References 16 publications

Dispersion and Exfoliation of Graphene in Rubber by an Ultrasonically‐Assisted Latex Mixing and In situ Reduction Process

Dispersion and Exfoliation of Graphene in Rubber by an Ultrasonically‐Assisted Latex Mixing and In situ Reduction Process

Avaliação de compostos de borracha natural utilizados em equipamentos de segurança

Thermal degradation of chlorosulfonated polyethylene rubber and ethylene propylene diene terpolymer

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