Influence of the network on the interaction parameter in system EPDM vulcanizate-solvent

Hrnjak-Murgić, Zlata; Jelenčić, Jasenka; Bravar, M.; Marovic, M.

doi:10.1002/(sici)1097-4628(19970801)65:5<991::aid-app17>3.0.co;2-v

Cited by 26 publications

(20 citation statements)

References 7 publications

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“…[38]. A constant value of the solvent interaction parameter c was used despite several authors claim that the solvent interaction parameter can depend on the crosslink density [39].…”

Section: Gel Content and Swellingmentioning

confidence: 99%

Erosion of the molecular network in the amorphous layers of polyethylene upon high- strain deformation

Bartczak

Grala

Richaud

et al. 2016

Polymer

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Samples of linear polyethylene, neat and crosslinked by irradiation with electron beam, were subjected to heavy plastic deformation by plane-strain compression up to the true strain exceeding 2 (deformation ratio l > 8) at room temperature. Structural studies of deformed samples and investigation of long-term strain recovery demonstrated that the deformation of the neat, non-crosslinked HDPE is completely reversible above the melting point of the crystalline phase, provided that the applied true strain does not exceed e ¼ 1.0 (l ¼ 2.7). At higher applied strains, e > 1, an irreversible deformation component emerged gradually, and at e ¼ 2.1 (l ¼ 8.2), the permanent, truly irreversible, residual strain was approx. e res ¼ 0.36 (l ¼ 1.4). In contrast, samples of crosslinked HDPE above T m exhibited complete reversibility of deformation, irrespectively of an applied strain, and e res z 0. The source of permanent irreversible strain component in neat HDPE is a deformation-induced partial destruction of the molecular network of entangled chains within amorphous interlamellar layers. The principal mechanism found was chain disentanglement, which was supplemented by a very limited chain scission. In the case of crosslinked materials, the dense and relatively homogeneous molecular network appeared robust enough to avoid any damage. Consequently, the strain appeared here fully reversible upon melting of crystalline phase.

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“…[38]. A constant value of the solvent interaction parameter c was used despite several authors claim that the solvent interaction parameter can depend on the crosslink density [39].…”

Section: Gel Content and Swellingmentioning

confidence: 99%

Erosion of the molecular network in the amorphous layers of polyethylene upon high- strain deformation

Bartczak

Grala

Richaud

et al. 2016

Polymer

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“…Com essas duas informações, pode-se calcular tanto VB, como V0. Além disso, segundo a literatura, o parâmetro de Flory para o sistema EPDM/n-heptano varia em torno de 0,4 [19,[28][29][30][31]. Desse modo, a única variável restante a ser determinada é ρB, a densidade da borracha.…”

Section: Densidade De Ligações Cruzadasunclassified

Caracterização De Correias Transportadoras De Alta Temperatura E Avaliação De Sua Vida Útil Com Base Na Degradação Térmica Durante Uso

Grilo¹,

Soares²,

Guastala³

2014

ABM Proceedings

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Resumo Correias transportadoras de alta temperatura são ativos críticos para a pelotização devido ao prejuízo que sua falha pode trazer para a produção. Nesse sentido, deve-se avaliar a vida útil da correia em uso, visando, principalmente, auxiliar sua manutenção, e nesse contexto o presente trabalho tem como proposta utilizar a caracterização dos componentes e o estudo da degradação térmica do material da cobertura de correias transportadoras de alta temperatura. As caracterizações foram realizadas de modo comparativo entre três tipos distintos de correias transportadoras de alta temperatura fornecidas para a VALE S.A. Os reforços das correias foram caracterizados por FT-IR para análise qualitativa do polímero. De maneira semelhante, as borrachas foram caracterizadas por meio da análise do produto de pirólise via FT-IR e a densidade de ligações cruzadas por meio da técnica de inchamento do polímero e aplicação da equação de Flory-Rhener, o que ajudou a justificar o comportamento das diferentes marcas de correia perante a degradação térmica, estudada em um trabalho anterior. A partir desses resultados e utilizando dados de variação das propriedades mecânicas do material em função do tempo e temperatura de processo, pôde-se avaliar a taxa de dano causado a cada correia e, aplicando-se dados reais de processo, avaliou-se o desempenho das correias em trabalho.

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“…The parameters of EPDM were employed as those of the MAH-g-EPDM. The crosslink densities were calculated using the data for toluene because the interaction parameter between EPDM and toluene is available from a literature 23 . Densities of toluene (ρ1) and EPDM (ρ2) are 0.865 and 0.87 g/cm 3 , respectively.…”

Section: Scheme-ii: Ionomer Formation Of 4-amino-2-methoxy Benzoic Acmentioning

confidence: 99%

“…The χ values were obtained from the literature; of χ = 0.429 + 0.218 ν2. 23 The Xcs were listed in Table-5. The order of the Xcs was L-glutamine > 4-amino-2methoxy benzoic acid > 4-amino salicylic acid > 12-amino lauric acid.…”

Section: Scheme-ii: Ionomer Formation Of 4-amino-2-methoxy Benzoic Acmentioning

confidence: 99%

Properties of Thermoplastic Elastomers Made of MAH-g-EPDM, Zinc Oxide and Amino Acids

Kwon¹,

Kim²,

Choi³

et al. 2013

Asian J. Chem.

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Thermoplastic elastomers were prepared by mixing maleic anhydride-grafted ethylene-propylene-diene terpolymer (MAH-g-EPDM), zinc oxide and amino acids. 4-Amino-2-methoxybenzoic acid (MBA), 4-aminosalicylic acid, 12-aminolauric acid and L-glutamine were employed as the amino acids. The thermoplastic elastomers were analyzed by infrared spectroscopy (IR), solvent extraction, crosslink density and physical properties. The amino acids reacted with maleic acid groups of the MAH-g-EPDM and zinc oxide to form ionomers. Like cured elastomers, it is possible that crosslink densities of the thermoplastic elastomers are measured using the solvent swelling method. Compared to the specimen without amino acids, crosslink densities of the thermoplastic elastomers decreased due to the long crosslinkages. Crosslink density of the sample containing 12-aminolauric acid was lower than the others. Physical properties of the sample containing 4-aminosalicylic acid were better than the others. This can be explained by the hetero-crosslinkages.

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Influence of the network on the interaction parameter in system EPDM vulcanizate-solvent

Cited by 26 publications

References 7 publications

Erosion of the molecular network in the amorphous layers of polyethylene upon high- strain deformation

Erosion of the molecular network in the amorphous layers of polyethylene upon high- strain deformation

Caracterização De Correias Transportadoras De Alta Temperatura E Avaliação De Sua Vida Útil Com Base Na Degradação Térmica Durante Uso

Properties of Thermoplastic Elastomers Made of MAH-g-EPDM, Zinc Oxide and Amino Acids

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