Effect of fillers on kinetics of epoxy cure

Dutta, Anindya; Ryan, Michael E.

doi:10.1002/app.1979.070240302

Cited by 140 publications

(69 citation statements)

References 31 publications

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“…The values of kinetic parameters (m, n and k) with a regression constant of 0.99 were determined by simultaneously solving Eqs (7)- (9). The results of kinetic pa- rameters for epoxy and epoxy-zeolite system are tabulated in Tables 1 and 2.…”

Section: Resultsmentioning

confidence: 99%

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Cure kinetics of epoxy resin-natural zeolite composites

Erdoğan

Seyhan

Ocak

et al. 2008

J Therm Anal Calorim

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The cure kinetics of epoxy resin and epoxy resin containing 10 mass% of natural zeolite were investigated using differential scanning calorimetry (DSC). The conformity of the cure kinetic data of epoxy and epoxy-zeolite system was checked with the autocatalytic cure rate model. The results indicated that the hydroxyl group on the zeolite surface played a significant role in the autocatalytic reaction mechanism. This group was able to form a new transition state between anhydride hardener and epoxide group. The natural zeolite particles acted as catalyst for the epoxy system by promoting its curing rate.

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Section: Resultsmentioning

confidence: 99%

“…(4). The cure kinetics of autocatalytic thermosetting resin systems are defined by Dutta-Rayan [9]. The model equation is given in Eq.…”

Section: Introductionmentioning

confidence: 99%

Cure kinetics of epoxy resin-natural zeolite composites

Erdoğan

Seyhan

Ocak

et al. 2008

J Therm Anal Calorim

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show abstract

“…The different fillers had a wide range of effects on the reaction rates of the resins studied. The reaction rates were found to increase, 13,15,16,20 decrease, 14,17,18,20 or remain the same 15 as that of the unfilled resins, depending on the fillers and resins studied. Therefore, there seems to be no general rule that can be applied to predict how particular fillers may affect the kinetics of a curing system.…”

Section: Introductionmentioning

confidence: 94%

Effect of Colloidal Fillers on the Cross-Linking of a UV-Curable Polymer: Gel Point Rheology and the Winter−Chambon Criterion

2001

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The effect of colloidal silica fillers on the cross-linking behavior of a model UV-curable polymer system (thiol-ene) is studied using in situ rheology and real-time FTIR spectroscopy. The validity of the Winter-Chambon criterion (convergence of the loss tangents at the gel point) is examined for the cross-linking of these filled polymers, some of which are strongly flocculated dispersions (physical gels) prior to chemical cross-linking. Two different types of colloidal silica particles are studied: one with octyl chains tethered to the surface and the other with methyl surface groups. The Winter-Chambon criterion is satisfied for all samples containing the methyl-terminated silica. However, the criterion breaks down for samples containing the octyl-modified silica, with the loss tangents not converging at any single point. This suggests the absence of a self-similar critical gel at the gel point in the latter case. Neither type of silica particles alters the mechanism of the cross-linking reaction, as revealed by FTIR spectroscopy, but they do retard the cross-linking kinetics. An alternate method is suggested for determining the chemical gel point of filled systems that fail to obey the Winter-Chambon criterion. This method involves monitoring the critical strain (limit of the linear viscoelastic region) at various UV exposure times. A dramatic increase is observed in the critical strain at the gel point, indicating a transition from weak, physical bonds to strong, covalent cross-links.

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“…2,30 Through specific interactions, a filler surface can also have a beneficial effect on polymerization. 31,32 In terms of possible specific interactions with the hexagonal boron nitride surface, amine and hydroxyl groups have been found to exist on its surface as discussed in another article. 25 However, the basic amine groups contribute more heavily to the surface's acid-base interactions as indicated by the greater basicity index as determined by inverse gas chromatography.…”

Section: Benzoxazine Coatings On Untreated Boron Nitridementioning

confidence: 97%