Chromatography of Epoxy Resins

Mestan, S. A.; Morris, C. E. M.

doi:10.1080/07366578408069972

Cited by 23 publications

(6 citation statements)

References 139 publications

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“…GPC18 was used as a relative measure of polydispersity and molecular weight of the epoxy resins, whereas epoxy group titration was used as a quantitative measure of molecular weight. The GPC molecular weight and molar mass calculated by titration were in reasonable agreement with theoretical values; the results are shown in Table I.…”

Section: Resultsmentioning

confidence: 99%

“…Given this assumption, eqs. (3) and (4) can be combined to give18 where B is a constant and g is a function of α. Thus, a graph of ln( d α/ dt ) versus 1/ T at constant conversion should be a straight line with the activation energy for polymerization calculated from the slope.…”

Section: Resultsmentioning

confidence: 99%

“…Samples were prepared by mixing the appropriate epoxy and amine components in a beaker and by heating to 130°C while stirring. When the solution became transparent, the catalyzed resin was cooled and stored in a freezer until required so as to minimize the onset of any curing reactions 18…”

Section: Methodsmentioning

confidence: 99%

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Cure properties of epoxies with varying chain length as studied by DSC

Gonis

Simon

Cook

1999

J. Appl. Polym. Sci.

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ABSTRACT:The cure of diglycidyl ether of bisphenol A (DGEBA) and a homologous series of poly(ethylene oxide) diglycidyl ether (PEODE) epoxy resins with 4,4Ј-diaminodiphenyl sulfone (DDS) was studied by scanning and isothermal differential scanning calorimetry (DSC). The heat of polymerization was relatively independent of monomer structure and chain length when determined by isothermal DSC. Variations in the heats of polymerization determined by the scanning method were attributed to degradative reactions at higher temperatures during the scan. The activation energies determined by scanning DSC experiments were relatively constant at 61 Ϯ 3 kJ/mol. However, using an isothermal cure method, the activation energies were found to vary with monomer structure and extent of cure. The isothermal kinetics were analyzed in terms of the autocatalytic model on the basis of competing reaction paths involving catalysis by either initial impurities or hydroxyl groups produced in situ. The activation energies of both reaction paths were found to vary with monomer structure and degree of conversion.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Cure properties of epoxies with varying chain length as studied by DSC

Gonis

Simon

Cook

1999

J. Appl. Polym. Sci.

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“…When the solution became transparent, the catalyzed resin was cooled and stored in a freezer until required so as to minimize the onset of any curing reactions. 18 Calorimetric measurements were made using a Perkin-Elmer DSC-7 under a constant purge of nitrogen gas (20 mL/min). Calibration was performed with known masses of pure indium and zinc.…”

Section: Methodsmentioning

confidence: 99%

Cure properties of epoxies with varying chain length as studied by DSC

Gonis

Simon

Cook

1999

J. Appl. Polym. Sci.

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The cure of diglycidyl ether of bisphenol A (DGEBA) and a homologous series of poly(ethylene oxide) diglycidyl ether (PEODE) epoxy resins with 4,4Ј-diaminodiphenyl sulfone (DDS) was studied by scanning and isothermal differential scanning calorimetry (DSC). The heat of polymerization was relatively independent of monomer structure and chain length when determined by isothermal DSC. Variations in the heats of polymerization determined by the scanning method were attributed to degradative reactions at higher temperatures during the scan. The activation energies determined by scanning DSC experiments were relatively constant at 61 Ϯ 3 kJ/mol. However, using an isothermal cure method, the activation energies were found to vary with monomer structure and extent of cure. The isothermal kinetics were analyzed in terms of the autocatalytic model on the basis of competing reaction paths involving catalysis by either initial impurities or hydroxyl groups produced in situ. The activation energies of both reaction paths were found to vary with monomer structure and degree of conversion.

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“…Chromatographic von Eposidharzcn gegeben worden [14], die erkeniicn lafit, dalJ die Umkelirphasen-HPLC m i t der Gradienten-Elutions-Teclinik die besten Erfolgsaussichteii besitzt. 7 z depends on the molar ratio of the monomers and was varied between 0.1 and 5.0.…”

Section: High Pressure Liquid Chromatography ( H P L C ) Of Dgeba-aniunclassified

Hochdruckflüssigkeitschromatographie (HPLC) von DGEBA‐Anilin‐Prepolymeren. Unvernetzte Epoxid‐Amin‐Additionspolymere. 10

et al. 1986

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Die Polyaddition von Bisphenol‐A‐diglycidylether (DGEBA) an Anilin führt bei DGEBA‐Überschuß zu telechelen Prepolymeren mit Glycidylendgruppen. n̄ hängt vom Molverhältnis der Monomere ab und wird von 0,1 bis 5,0 variiert. Die chemische Struktur der Prepolymere wird durch C,H,N‐Analysen, IR‐,1H‐ und 13C‐NMR‐Spektren belegt, und ihre Mn ‐Werte werden durch Dampfdruckosmometrie gemessen. Mittels Umkehrphasen‐HPLC an Lichrosorb RP‐18 wird durch Anwendung von Wasser/Acetonitril‐Gradienten‐Elution eine ausgezeichnete Auftrennung der Prepolymere in mehr als 20 Oligomer‐Fraktionen erreicht.

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Chromatography of Epoxy Resins

Cited by 23 publications

References 139 publications

Cure properties of epoxies with varying chain length as studied by DSC

Cure properties of epoxies with varying chain length as studied by DSC

Cure properties of epoxies with varying chain length as studied by DSC

Hochdruckflüssigkeitschromatographie (HPLC) von DGEBA‐Anilin‐Prepolymeren. Unvernetzte Epoxid‐Amin‐Additionspolymere. 10

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