Studies of interactions in oligomeric epoxy resin-isocyanate systems

Kadurina, T.I.; Prokopenko, V. A.; Omel'chenko, S. I.

doi:10.1016/0014-3057(86)90062-5

Cited by 12 publications

(8 citation statements)

References 13 publications

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“…Kadurina et al 25 also reported that the presence of a tertiary amine in the epoxy monomer provoked the isomerization of the isocyanate groups at 100 °C. This explains the exothermic peak centered at 100 °C (Figure 4) because the MY 721 monomer contains tertiary amines in its structure (Figure 2).…”

Section: Resultsmentioning

confidence: 99%

“…DeMeuse et al 24 claimed that tertiary amines are suitable for the high-yield synthesis of oxazolidones at temperatures between 80 and 150 °C, but at a lower rate: from 30 min to 8 h. Studies on the reactivity between epoxy and isocyanate monomers without the use of catalysts are rare. Kadurina et al 25 studied the reactivities of different epoxy−isocyanate systems as a function of the structures of both monomers (aliphatic or aromatic). They concluded that, with no catalyst, a reaction was occurring and could be divided into two steps.…”

Section: Resultsmentioning

confidence: 99%

“…Studies on the reactivity between epoxy and isocyanate monomers without the use of catalysts are rare. Kadurina et al studied the reactivities of different epoxy–isocyanate systems as a function of the structures of both monomers (aliphatic or aromatic). They concluded that, with no catalyst, a reaction was occurring and could be divided into two steps.…”

Section: Resultsmentioning

confidence: 99%

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Engineered Interface Chemistry to Improve the Strength of Carbon Fiber Composites Cured by Electron Beam

Vautard

Grappe

Ozcan

2014

Ind. Eng. Chem. Res.

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A reactive sizing was designed to achieve high levels of interfacial adhesion and improved mechanical properties with a carbon fiber–acrylate system cured by electron beam (EB). The sizing was made of a partially cured epoxy sizing with a high density of pendant functional groups (acrylate functionality) to facilitate covalent bonding with the matrix. The interlaminar shear strength improved from 61 to 81 MPa (+33%) without postprocessing, reaching a shear strength similar to that of the same system cured by a thermal treatment. Observation of the fracture profiles clearly highlighted a change in the fracture mechanism from a purely adhesive failure to a cohesive failure. To the best of our knowledge, such improvements of the mechanical properties of carbon fiber composites cured by EB, without any postcure, have not been reported previously. This constitutes a breakthrough for the industrial development of EB curing of composites.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Engineered Interface Chemistry to Improve the Strength of Carbon Fiber Composites Cured by Electron Beam

Vautard

Grappe

Ozcan

2014

Ind. Eng. Chem. Res.

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“…Одним из способов такой модификации является использование взаимодействия эпоксидных олигомеров с полиизоцианатом. Такой подход описывался в работах [6][7][8]…”

Section: полимерное связующее всэ-1212unclassified

FSUE "VIAM" solvent-free binders for polymer composite materials

Каблов¹,

Chursova²,

Babin³

et al. 2016

polymmattech

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Представлены разработки современных расплавных связующих для полимерных композиционных материалов с рабочей температурой до 350 °С. Описаны основные особенности и подходы, реализованные при разработке связующих, как для автоклавной технологии получения изделий, так и для безавтоклавных технологий.

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“…Epoxides are able to directly react with water to diols, with carboxylic acids to ester alcohols, and with alcohols to ether alcohols [9]. Moreover, epoxides have been reported to react with and partially displace isocyanate in urethane mixtures [6,10,11]; hence, urethane formulations with increased bio-based content can be developed. A multifunctional monomer containing one or more epoxide moieties may thus to some extent displace alcohol and isocyanate in the regular urethane formulation.…”

Section: Introductionmentioning

confidence: 99%

Isocyanate Reduction by Epoxide Substitution of Alcohols for Polyurethane Bioelastomer Synthesis

Lubguban

Lozada

et al. 2011

International Journal of Polymer Science

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A phosphate ester-forming reaction was carried out by mixing epoxidized soybean oil with up to 1.5%o-phosphoric acid.In situoligomerization took effect almost instantly producing a clear, homogeneous, highly viscous, and a low-acid product with a high average functionality. The resulting epoxide was used as a reactant for urethane bioelastomer synthesis and evaluated for rigid foam formulation. Results have shown that with a number of catalysts tested phosphoric acid significantly enhances a solvent-free oxirane ring cleavage and polymerization of the epoxidized soybean oil via phosphate-ester formation at room temperature. The resulting phosphoric acid-catalyzed epoxide-based bioelastomer showed an 80% decrease in extractable content and increased tensile strength at the same isocyanate loading relative to the noncatalyzed epoxide. The oligomerized epoxidized soybean oil materials exhibited ASTM hydroxyl values 40% less than the nonoligomerized starting material which translates to reduced isocyanate loadings in urethane applications.

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Studies of interactions in oligomeric epoxy resin-isocyanate systems

Cited by 12 publications

References 13 publications

Engineered Interface Chemistry to Improve the Strength of Carbon Fiber Composites Cured by Electron Beam

Engineered Interface Chemistry to Improve the Strength of Carbon Fiber Composites Cured by Electron Beam

FSUE "VIAM" solvent-free binders for polymer composite materials

Isocyanate Reduction by Epoxide Substitution of Alcohols for Polyurethane Bioelastomer Synthesis

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