Phase transformations during the cure of unsaturated polyester resins

Lionetto, Francesca; Rizzo, R.; Luprano, V.A.M.; Maffezzoli, Alfonso

doi:10.1016/j.msea.2003.07.025

Cited by 35 publications

(27 citation statements)

References 11 publications

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“…Gelation is a critical transition taking place during the formation of the polymeric network and corresponds to the generation of a huge macromolecular structure that percolates the reaction medium. Macroscopically, this transition is characterized by the change of the curing resin from viscous liquid to elastic gel: the viscosity of the system becomes infinite and the shear response of the resin grows from zero to finite value once the thermosetting resin has gelled, it cannot be further processed [39,40].…”

Section: Rheological Characterizationmentioning

confidence: 99%

Curing kinetics of epoxy-deep eutectic solvent mixtures

Lionetto

Timo

2015

Thermochimica Acta

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Section: Rheological Characterizationmentioning

confidence: 99%

Curing kinetics of epoxy-deep eutectic solvent mixtures

Lionetto

Timo

2015

Thermochimica Acta

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“…Among the different techniques which can be used to study the cure kinetics of a thermosetting polymer [32][33][34][35], DSC and rheometry are two of the main approaches commonly employed. Differential scanning calorimetry (DSC) is based on the assumption that the heat produced during cure is proportional to the extent of reaction.…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon nanofibers on the cure kinetics of unsaturated polyester resin: Thermal and chemorheological modelling

Monti

Puglia

Natali

et al. 2011

Composites Science and Technology

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Please cite this article as: Monti, M., Puglia, D., Natali, M., Torre, L., Kenny, J.M., Effect of carbon nanofibers on the cure kinetics of unsaturated polyester resin: thermal and chemorheological modelling, Composites Science and Technology (2011), doi: 10.1016/j.compscitech.2011 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractWe report the study of the effects of carbon nanofibers (CNFs) on the cure kinetics and on the chemorheology of unsaturated polyester resins (UP). Two main experimental techniques were utilized: differential scanning calorimetry and rheometry. Isothermal and dynamic tests were performed on the neat polyester resin and on two nanocomposite systems, with 0.5 and 1.0 wt% of CNFs. Furthermore, a TGA study of the selected systems at different isothermal temperatures was performed to evaluate the styrene consumption and related loss rate during the curing process. Subsequently, a phenomenological model (autocatalytic approach) was applied to the experimental data, both in isothermal and dynamic conditions. In the case of dynamic curing, the evidence of multiple peaks in the heat flow curves was studied through the deconvolution of the overall reaction thermogram in single reaction steps. An empirical rheological model coupled with the reaction kinetics was successfully applied to simulate the viscosity changes of the UP matrix. Experimental and modelling results demonstrate the presence of a delay effect of the CNFs on the cure of the UP resin matrix.

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“…The oven temperatures were set at 80, 100, 120 and 140 • C. These temperatures were selected after studying a DSC (differential scanning calorimetry) dynamic scan for the uncured sample which showed that curing took place at temperature above 75 • C. When conducting isothermal tests, the oven was preheated to the predetermined isothermal temperature, and then the sample was installed quickly and held at the considered cure temperature. A sol-gel method [14][15][16][17][18] to evaluate the corresponding conversion through the reaction was used.…”

Section: Methodsmentioning

confidence: 99%

The kinetic analysis of isothermal curing reaction of an unsaturated polyester resin: Estimation of the density distribution function of the apparent activation energy

Janković

2010

Chemical Engineering Journal

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Phase transformations during the cure of unsaturated polyester resins

Cited by 35 publications

References 11 publications

Curing kinetics of epoxy-deep eutectic solvent mixtures

Curing kinetics of epoxy-deep eutectic solvent mixtures

Effect of carbon nanofibers on the cure kinetics of unsaturated polyester resin: Thermal and chemorheological modelling

The kinetic analysis of isothermal curing reaction of an unsaturated polyester resin: Estimation of the density distribution function of the apparent activation energy

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