Characterization of the network structure in amine‐cured epoxy resins by selective degradation

Stütz, Herbert; Mäder, Hans‐Joachim; Šimák, P.; Voelkel, R.

doi:10.1002/macp.1994.021950807

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…In fully cured resins the properties are dominated by the crosslink density and the statistical network theories represent always the actual state of the network. Since the theory is valid both for formation and degradation,2–4 the changes of the network can be used to characterize the kinetics of thermal degradation.…”

Section: Introductionmentioning

confidence: 99%

Lifetime assessment of epoxies by the kinetics of thermal degradation

Stütz

2003

J of Applied Polymer Sci

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ABSTRACT:The kinetics of thermal degradation of 4,4Ј-diaminodiphenylsulfone (DDS)-cured glycidylethers (DGBA) and glycidylamines (TGDDM) have been studied by isothermal annealing. Thermal degradation proceeds via first-order kinetics with activation energies of 138 (DGBA/DDS) and 95 kJ/mol (TGDDM/DDS). From these data the temperaturedependent lifetime can be calculated. Based on the heat distortion temperature and 20 years' service as criteria, the upper service temperature is found to be around 115-120°C.In spite of the different activation energies and bond stabilities, only marginal differences in the upper allowed service temperatures between these resins were found. Only slight improvements can be expected by optimizing the cure conditions.

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Section: Introductionmentioning

confidence: 99%

Lifetime assessment of epoxies by the kinetics of thermal degradation

Stütz

2003

J of Applied Polymer Sci

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Comparison of the structure of step‐growth networks obtained by Monte Carlo simulation and branching theory

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Stütz

2002

J of Applied Polymer Sci

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ABSTRACT:To facilitate the characterization of polymer networks, a comparison was made between branching theory and Monte Carlo simulations using an amine-cured epoxy as an example for step-growth polymer networks. The primary objective was the validation of the simulation results with the existing statistical theories by a crosscheck, to ensure that simulations can also be used for the characterization of real, highly complicated multicomponent systems, which are intractable by theories. Commercially available software was used for simulation; the theoretical calculations were performed using the approach of Macosko and Miller. In general, the results of both methods are consistent; the simulation revealed some uncertainties only in the vicinity of the gel point. Since the statistical theories have been validated experimentally, it may be concluded that the simulation can also successfully be used for the treatment of real, highly complicated multicomponent systems, which for practical purposes are intractable by statistical theories. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 929 -935, 2002

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Characterization of the network structure in amine‐cured epoxy resins by selective degradation

Cited by 2 publications

References 29 publications

Lifetime assessment of epoxies by the kinetics of thermal degradation

Lifetime assessment of epoxies by the kinetics of thermal degradation

Comparison of the structure of step‐growth networks obtained by Monte Carlo simulation and branching theory

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