Prediction of the curing behavior for unsaturated polyester–styrene systems used for monitoring sheet moulding compounds (SMC) process

Massardier-Nageotte, Valérie; Cara, Fabien; Maazouz, Abderrahim; Seytre, Gérard

doi:10.1016/j.compscitech.2004.01.007

Cited by 12 publications

(4 citation statements)

References 20 publications

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“…Respecto a la naturaleza química de la resina, es importante destacar las investigaciones de Hanemman (2006), en las cuales se estudió primero la influencia de aditivos polares oligoméricos y citratos en el comportamiento de la viscosidad con la temperatura en resinas isoftálicas y posterioremente, se estudió la influencia de la adición de disper-santes de ésteres alquílicos de polietilén glicol en el comportamiento de esta misma variable con la temperatura y con la concentración del dispersante. Respecto a la cantidad de estireno, algunos trabajos han estudiado el comportamiento de la viscosidad con el contenido de este monómero (Boreau et al, 2001;La Scala et al, 2004, Massardier-Nageote et al, 2004. En el trabajo de Boreau et al, (2001) se demostró experimentalmente que la variación de la viscosidad con la temperatura puede distar de ser totalmente logarítmica conforme el contenido de estireno aumenta, y que dicha variación es un indicativo de la fragilidad de la resina.…”

Section: Curvas De Viscosidad Vs Temperaturaunclassified

Selección de resinas de poliéster insaturado para procesos de transferencia de resina en molde cerrado

Jaramillo-Zapata

Patiño-Arcila

2012

TecnoL.

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En este artículo se analizan tres tipos de resinas poliéster in-saturado comerciales de amplio uso en el mercado nacional y se evalúa su conveniencia de uso en procesos de transferencia de resina en molde cerrado (RTM), de acuerdo con criterios de visco-sidad y reactividad. Se compara la viscosidad de las resinas entre 15 y 50°C, así como la reactividad mediante curvas de curado a temperatura ambiente, con porcentajes de catalizador del 1, 1.5 y 2%. De acuerdo con los resultados se determinó que algunas de las resinas son susceptibles de uso en procesos RTM, por su apropiada viscosidad, estabilidad en la reactividad y su velocidad de curado. Estas características son de gran importancia al momento de seleccionar las resinas poliéster insaturado, de acuerdo con las condiciones del proceso en molde cerrado.

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Section: Curvas De Viscosidad Vs Temperaturaunclassified

Selección de resinas de poliéster insaturado para procesos de transferencia de resina en molde cerrado

Jaramillo-Zapata

Patiño-Arcila

2012

TecnoL.

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“…This heat exchange ends at around t 3 ϳ 40 seconds. This time is called the induction time corresponding to the end of the consumption of inhibitors by the initiators present in the paste formulation [18].…”

Section: Molding Experiments: Flow Analysismentioning

confidence: 99%

Correlation between sizing formulation and compressive behavior of concentrated glass bundle suspensions

2005

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The correlation between sizing formulation, bundle mechanical characteristics, and bundle-matrix static and dynamic interactions are investigated. Two glass-fiber sizing formulations are considered, one containing polyvinyl acetate (PVAc) and the other polyester/PVAc, as conventionally used in sheet molding compounds (SMC). Axial compression tests are conducted on dry two-dimensional (2D) random suspensions. The forced packing is governed by the bending of fiber bundle segments between bundle-bundle contact points. Benchmarking of the experimental curves with a modified theoretical model provides an estimation of the fiber bundle bending rigidity under forced packing conditions. This value is found to depend on the bundle sizing as well as on the interaction with solvents present in the matrix as is the case for SMC. Free flow and molding experiments are performed on planar SMC sheets using the two different fiber bundles as reinforcements. The results confirm the dependence of the molding energy and the SMC rheology on the bundles chemical and mechanical characteristics. POLYM. COMPOS., 26:370 -376, 2005.

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“…However, current models taking into account the thermo-kinetic nature of such composites remains a complementary key towards the thermo-mechanical modeling of reinforced parts. First studies were accomplished by Lee in [6] and by Maazouza [7] using a model based on the radical polymerisation mechanisms. Currently adapted models to upcoming reinforced materials are needed.…”

Section: Introductionmentioning

confidence: 99%

Thermo-rheological-kinetical study of compression molding of fibre-reinforced composites

Betancourt¹,

Laure²,

Silva³

et al. 2016

AIP Conference Proceedings

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To improve the modeling of fiber reinforced composites, we present in this work numerical methods able to compute both fiber-reinforced composites deformation in squeeze flow and thermal-kinetic evolution. The rheology is given by an homogeneous orthotropic model for fiber composites which describes the anisotropy of the in-plane fiber. The thermics is then extended accounting for the reaction here formulated by the Bailleul's model. Both physics are related since the kinetic evolution as well as the temperature profile modify the rheology of the composites, giving raise to the thermo-rheological-kinetical coupling by means of the viscosity temperature dependence. A study case is presented, where the mold temperature is set to 150 • C with a composite sample at 40 • C. Thermal transfer begins as well as sample compression at constant speed. We present the evolution of the reaction, temperature and viscosity at the core and the surface. Reaction in the core of the material is much quicker than in the surface. Which means that a mapping of viscosity values is presented during the reaction modifying the mechanical response.

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Prediction of the curing behavior for unsaturated polyester–styrene systems used for monitoring sheet moulding compounds (SMC) process

Cited by 12 publications

References 20 publications

Selección de resinas de poliéster insaturado para procesos de transferencia de resina en molde cerrado

Selección de resinas de poliéster insaturado para procesos de transferencia de resina en molde cerrado

Correlation between sizing formulation and compressive behavior of concentrated glass bundle suspensions

Thermo-rheological-kinetical study of compression molding of fibre-reinforced composites

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