Poly(ethylene-co-vinyl alcohol-co-vinyl mercaptoacetate) (EVALSH)-determination of the vinyl mercaptoacetate content by thermogravimetric analysis and FTIR spectroscopy

Dutra, Rita C. L.; Lourenço, Vera L.; Diniz, Milton Faria; Azevedo, Margarete F. P.; Barbosa, Roseane Moreira Sampaio; Soares, Bluma G.

doi:10.1007/bf00342451

Cited by 20 publications

(7 citation statements)

References 6 publications

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“…The FTIR results indicated the esterification reaction between the hydroxyl group of PLLA and the carboxyl of CEPA occurred as reported by other studies [37,38]. The detailed process was shown in Figure 5b.…”

Section: Mechanical Propertiessupporting

confidence: 83%

“…As shown in Figure 6a,b, the PLLA scaffold was hydrophobic, whose WCA was about 88.7°. Compared with the PLLA scaffold, the hydrophilicity of composite scaffolds with different contents The FTIR results indicated the esterification reaction between the hydroxyl group of PLLA and the carboxyl of CEPA occurred as reported by other studies [37,38]. The detailed process was shown in Figure 5b.…”

Section: Wca Xrd and Tga Analysessupporting

confidence: 69%

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Phosphonic Acid Coupling Agent Modification of HAP Nanoparticles: Interfacial Effects in PLLA/HAP Bone Scaffold

Shuai

Yang

et al. 2020

Polymers

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In order to improve the interfacial bonding between hydroxyapatite (HAP) and poly-l-lactic acid (PLLA), 2-Carboxyethylphosphonic acid (CEPA), a phosphonic acid coupling agent, was introduced to modify HAP nanoparticles. After this. the PLLA scaffold containing CEPA-modified HAP (C-HAP) was fabricated by selective laser sintering (frittage). The specific mechanism of interfacial bonding was that the PO32− of CEPA formed an electrovalent bond with the Ca2+ of HAP on one hand, and on the other hand, the –COOH of CEPA formed an ester bond with the –OH of PLLA via an esterification reaction. The results showed that C-HAP was homogeneously dispersed in the PLLA matrix and that it exhibited interconnected morphology pulled out from the PLLA matrix due to the enhanced interfacial bonding. As a result, the tensile strength and modulus of the scaffold with 20% C-HAP increased by 1.40 and 2.79 times compared to that of the scaffold with HAP, respectively. In addition, the scaffold could attract Ca2+ in simulated body fluid (SBF) solution by the phosphonic acid group to induce apatite layer formation and also release Ca2+ and PO43− by degradation to facilitate cell attachment, growth and proliferation.

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Section: Mechanical Propertiessupporting

confidence: 83%

Section: Wca Xrd and Tga Analysessupporting

confidence: 69%

Phosphonic Acid Coupling Agent Modification of HAP Nanoparticles: Interfacial Effects in PLLA/HAP Bone Scaffold

Shuai

Yang

et al. 2020

Polymers

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“…The introduction of thiol groups along the EVA copolymers was performed by an esterification reaction of an hydrolyzed EVA sample with mercaptoacetic acid [16][17] .…”

Section: Introductionmentioning

confidence: 99%

Mercapto-modified copolymers in polymer blends, 1. Functionalization of EPDM with mercapto groups and its use in NBR/EPDM blends

Oliveira

Soares²,

Santos

et al. 1999

Macromol. Rapid Commun.

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SUMMARY: Ethylene-propylene-diene rubber (EPDM) was reacted with thioacetic acid in the presence of 2,29-azoisobutyronitrile (AIBN), giving rise to thioacetate-modified EPDM (EPDMTA). The extent of the incorporation was studied as a function of both thioacetic acid and AIBN concentration and reaction time. The products were analyzed by FTIR spectroscopy, sulfur content, and 1 H NMR spectroscopy. The hydrolysis of EPDMTA in a NaOH methanolic solution resulted in mercapto-modified EPDM (EPDMSH). The addition of 5 wt.-% of this functionalized copolymer to a sulfur-vulcanized nitrile rubber (NBR)/EPDM (70 : 30 wt.-%) blend accelerated the vulcanization process as indicated by oscillating disk rheometer analysis. In addition, an improvement of mechanical and ageing properties was also observed.

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“…Com. S.A. Copolímero de etileno -acetato de vinila (EVA18) (18% em peso de acetato de vinila; índice de fluidez = 2,3g/10 min a 120 °C) foi cedido pela Petroquímica Triunfo S.A. EVA funcionalizado com grupos mercaptana (EVALSH) foi obtido em nosso laboratório, a partir da reação de esterificação de EVA hidrolisado e ácido mercaptoacético [21] . EVASH usado neste estudo contém 62 mmol% de grupos mercaptana, determinado por análise termogravimétrica.…”

Section: Methodsunclassified

Efeito da compatibilização da mistura NBR/EVA sobre sua morfologia de fase co-contínua

Soares

Oliveira

2003

Polímeros

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O objetivo deste trabalho foi investigar a influência do poli (etileno-co-acetato de vinila) funcionalizado com grupos mercaptana (EVALSH) nas propriedades reológicas, morfológicas e dinamico-mecânicas de misturas envolvendo borracha nitrílica (NBR) e copolímero de etileno - acetato de vinila (EVA). Experiências envolvendo extração seletiva da fase NBR associadas à análise de microscopia eletrônica de varredura indicaram que estruturas do tipo co-contínuas são formadas em uma faixa de composição de 30 a 60 % em massa de EVA. A adição de EVALSH não afetou esta faixa de co-continuidade, porém deslocou o limiar de percolação para menores teores de EVA. Este comportamento foi mais pronunciado em misturas ricas em NBR. A faixa de co-continuidade também foi evidenciada a partir de análise dinamico-mecânica. Dados reológicos revelaram também que a adição de EVALSH aumentou a viscosidade do sistema para misturas ricas em NBR.

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Poly(ethylene-co-vinyl alcohol-co-vinyl mercaptoacetate) (EVALSH)-determination of the vinyl mercaptoacetate content by thermogravimetric analysis and FTIR spectroscopy

Cited by 20 publications

References 6 publications

Phosphonic Acid Coupling Agent Modification of HAP Nanoparticles: Interfacial Effects in PLLA/HAP Bone Scaffold

Phosphonic Acid Coupling Agent Modification of HAP Nanoparticles: Interfacial Effects in PLLA/HAP Bone Scaffold

Mercapto-modified copolymers in polymer blends, 1. Functionalization of EPDM with mercapto groups and its use in NBR/EPDM blends

Efeito da compatibilização da mistura NBR/EVA sobre sua morfologia de fase co-contínua

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