The degradation of new thermally degradable thermosets obtained by cationic curing of mixtures of DGEBA and 6,6-dimethyl (4,8-dioxaspiro[2.5]octane-5,7-dione)

González, Lidia; Ramis, Xavier; Salla, Josep María; Mantecón, Ana; Serra, Àngels

doi:10.1016/j.polymdegradstab.2007.01.007

Cited by 43 publications

(32 citation statements)

References 24 publications

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“…The thermal stability of the material obtained with lanthanum triflate is higher, and the bimodal shape of its DTG curve is most characteristic. In the previous study with MCP, 9 we observed a three-modal DTG curve for the analogous material, with a broad peak at a lower temperature, which is not found in the MDM curves. Therefore, we think that the spiranic structure of MCP facilitated the degradative process.…”

Section: Thermogravimetric Studiesmentioning

confidence: 51%

“…In a previous study, 9 we demonstrated the enhanced degradability of thermosets obtained by the copolymerization of DGEBA with MCP due to the formation of tertiary ester groups in the network. From the analysis of the volatiles that evolved on heating, we could detect the rupture of these ester groups and also the breakage of the ether linkages.…”

Section: Thermogravimetric Studiesmentioning

confidence: 83%

“…If we compare the temperatures of the initial degradation with those previously published, we can conclude that the spiranic MCP lactone favors degradation. 9 The kinetic parameters for the degradation (E a , A, and k) were calculated only for the ytterbium triflate cured materials, which show a unimodal degradation curve, because the appearance of more than one peak for lanthanum triflate cured materials makes the kinetic comparison difficult. Using a procedure similar to that previously described for the curing of DGEBA/ MDM mixtures, we obtained the values collected in Table III.…”

Section: Thermogravimetric Studiesmentioning

confidence: 99%

“…[5][6][7] Among ester groups, the tertiary ones are the most easily broken, and so we considered in a previous study their introduction by the copolymerization of diglycidyl ether of bisphenol A (DGEBA) resins with a Meldrum acid (MA) derivative, 6,6-dimethyl-(4,8-dioxaspiro [2.5]octane-5, 7-dione) (MCP), with a spiranic skeleton. 8,9 MCP was selected because it allows the introduction of tertiary ester groups into the network, which facilitates the degradation process of the thermoset. The expandable behavior of MCP on curing was also demonstrated.…”

Section: Introductionmentioning

confidence: 99%

“…2 The presence of lanthanide triflates in the cured material also facilitates the thermal degradation of the thermoset. 9 …”

Section: Introductionmentioning

confidence: 99%

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Cationic curing of diglycidyl ether of bisphenol A and 2,2,5,5‐tetramethyl‐4,6‐dioxo‐1,3‐dioxane and degradation of the thermosets obtained

González

Ramis

Salla

et al. 2008

J of Applied Polymer Sci

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Ytterbium and lanthanum triflates were used as cationic initiators to cure mixtures of diglycidyl ether of bisphenol A and 2,2,5,5-tetramethyl-4,6-dioxo-1,3-dioxane in several proportions. The evolution of the epoxy and lactone during curing and the linear ester groups in the final materials were evaluated with Fourier transform infrared in the attenuated total reflection mode. The shrinkage after curing and the thermal degradability of the materials with variations in the comonomer ratios and initiator used were evaluated and related to the chemical structure of the final network. The expandable character of 2,2,5,5-tetramethyl-4,6-dioxo-1,3-dioxane was confirmed. The obtained materials were more degradable than conventional epoxy resins because of the tertiary ester groups incorporated into the network by copolymerization. The kinetic parameters of the curing and degradation processes were calculated with differential scanning calorimetry and thermogravimetric analysis, respectively, with isoconversional procedures applied in both cases.

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Section: Thermogravimetric Studiesmentioning

confidence: 51%

Section: Thermogravimetric Studiesmentioning

confidence: 83%

Section: Thermogravimetric Studiesmentioning

confidence: 99%