Phenolic Resins

Gardziella, Arno; Pilato, Louis A.; Knop, André

doi:10.1007/978-3-662-04101-7

Cited by 286 publications

(189 citation statements)

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“…Renewable resources can constitute an attractive alternative to conventional petrochemical resources [1][2][3]. Thus, recent work on resins derived from natural products has led to the development of rigid foams based on polyflavonoid tannins-furfuryl alcohol copolymerization, giving foams of excellent performance and characteristics [4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

MALDI-TOF and 13C NMR Analysis of Tannin–Furanic–Polyurethane Foams Adapted for Industrial Continuous Lines Application

et al. 2014

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Mixed phenolic-polyurethane-type rigid foams were developed using tannin-furfuryl alcohol natural materials co-reacted with polymeric isocyanate in the proportions imposed by the limitations inherent to continuous industrial plants for polyurethane foams. A variety of different copolymerization oligomers formed. Urethanes appeared to have been formed with two flavonoid tannin sites, mainly at the flavonoid hydroxyl group at C3, but also, although less, on the phenolic hydroxyl groups of the flavonoid oligomers. Urethanes are also formed with (i) glyoxal in the formulation, be it pre-reacted or not with the tannin; (ii) with phenolsulfonic acid and (iii) with furfural. This latter one, however, greatly favors reaction with the A-ring of the flavonoids through OPEN ACCESSPolymers 2014, 6 2986 a methylene bridge rather than reaction with the isocyanate groups to form urethanes. All of the materials appeared to have co-reacted in a manner to form urethane and methylene bridges between all of the main components used. Thus, the tannin, the furfuryl alcohol, the isocyanate, the glyoxal and even the phenol sulfonic acid hardener formed a number of mixed species linked by the two bridge types. Several mixed species comprised of 2, 3 and even 4 co-reacted different components have been observed.

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Section: Introductionmentioning

confidence: 99%

MALDI-TOF and 13C NMR Analysis of Tannin–Furanic–Polyurethane Foams Adapted for Industrial Continuous Lines Application

et al. 2014

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“…Adhesive strengths were evaluated from T-peel tests on joints produced between the surface chlorinated SBS rubber and roughened leather using two different polychloroprene adhesives. Both polychloroprene adhesives were formulated with the same base polymer (DENKA A-90) but PCP0 did not contain any resin and PCP30R was formulated with 30 phr (parts per hundred) of a thermoreactive phenolic resin (SP-154) provided by Shenectady Europe (SI Group, Béthune, France) [7]. Table 1 shows the formulations of the two polychloroprene adhesives.…”

Section: Methodsmentioning

confidence: 99%

Elimination of the reactivation process in the adhesion of chlorinated SBS rubber with polychloroprene adhesives

Navarro-Bañón¹,

Pastor-Blas

Martı́n-Martı́nez³

2007

Express Polym. Lett.

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Abstract. Chlorination treatment of a thermoplastic styrene-butadiene-styrene rubber (SBS) with a 3 wt% solution of trichloroisocyanuric acid (TCI) in methyl ethyl ketone (MEK) introduces chlorinated and oxidized moieties on the rubber surface which increase its surface energy and produces surface microroughness. Consequently adhesion properties, evaluated by T-peel strength measurements in chlorinated SBS/solvent based-polyurethane adhesive/leather joints, are enhanced. In this study, two solvent-based polychloroprene adhesives (PCP0 and PCP30R) have been considered as an alternative to the commonly used solvent-based polyurethane adhesive (PU). A thermoreactive phenolic resin was added to one of the polychloroprene adhesive formulations (PCP30R). This tackifier resin favors chlorination of the adhesive and reinforces the interface between the chlorinated adhesive and the chlorinated rubber surface. Besides, PCP30R adhesive does not need adhesive reactivation and considerable high T-peel strength value (5.7±0.3 kN/m) was obtained. Elimination of the reactivation process implies a considerable improvement of the manufacturing process in the footwear industry.

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“…Por possuírem várias propriedades desejáveis, como boa resistência mecânica e térmica, estabilidade dimensional, alta resistência a solventes,ácidos é agua, as resinas fenólicas são muito populares em uma extensa gama de aplicações, incluindo a aplicação como aglomerante em materiais de atrito [5]. As resinas fenólicas do tipo novolaca são produzidas por catalisadorácido e com razão molar formaldeído/fenol menor que 0,9 e necessitam de um coreagente, normalmente hexametilenotetramina (HMTA), para se tornarem termorrígidas [6], [7]. Duas transições principais ocorrem durante a formação da rede polimérica: gelificação e vitrificação (transição vítrea).…”

Section: Introductionunclassified

Aplicação de planejamento experimental na otimização do processo de pós-cura de pastilhas de freio em forno contínuo

2018

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Frequentemente o engenheiro se depara com situações onde o principal objetivo é otimizar um processo, em termos de uma ou mais respostas, respeitando as especificações do produto e vínculos impostos sobre o processo. Com o mercado automobilístico cada vez mais cada vez mais competitivo, a inserção de processos mais rápidos e de menor custo é de extrema importância para a sustentabilidade das empresas. Contribuindo no desenvolvimento dos processos de fabricação de materiais de atrito utilizados em pastilhas de freio para automóveis, este trabalho tem como objetivo otimizar o processo de pós-cura em fornos contínuos (em substituição ao processo realizado em fornos estacionários). Para isso, foram avaliadas as propriedades do material de atrito (dureza Gogan, massa específica, compressibilidade, resistência ao cisalhamento e ruído), em função das variáveis de processo, tempo de residência e temperatura de trabalho. Com auxílio da metodologia de superfície de resposta foram construídos modelos matemáticos que descrevem o comportamento das propriedades do material de atrito em função das variáveis de processo, que permitiram determinar as condições ótimas de processo. Por fim, foi realizada a análise termomecânica do material de atrito, fornecendo informações sobre o comportamento mecânico do material durante o processo em forno contínuo. http://dx.doi.org/10.18226/23185279.v6iss1p1

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Phenolic Resins

Cited by 286 publications

References 0 publications

MALDI-TOF and 13C NMR Analysis of Tannin–Furanic–Polyurethane Foams Adapted for Industrial Continuous Lines Application

MALDI-TOF and 13C NMR Analysis of Tannin–Furanic–Polyurethane Foams Adapted for Industrial Continuous Lines Application

Elimination of the reactivation process in the adhesion of chlorinated SBS rubber with polychloroprene adhesives

Aplicação de planejamento experimental na otimização do processo de pós-cura de pastilhas de freio em forno contínuo

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