In-situ investigations of the curing of a polyester resin

Investigation of thermo-reversibility of polymer crosslinked by reversible covalent bonds through torque measurement

“…This is actually an in-situ method to observe crosslinking of polymer at near zero shear rate. In-situ measurement could well reflect the dynamic behavior of polymers being crosslinked [24]. In the present study, torque measurement was performed using a typical rubber curemeter to investigate the crosslinking and de-crosslinking behavior of thermo-reversible crosslinked polymer.…”

Investigation of the Kinetics of Curing Reaction for the Resin Matrix Polymer Composite Based on Near-Infrared Spectroscopy

“…Vargas [36] explored the solidification process of UPR using NIR spectra, the parameters are determined by fit of the equations to the data using PLS, two kinetic models are applied to the experimental data calculated from NIR spectra of different time, this result is that corresponds with the autocatalytic model supplemented by 1 H-NMR. In order to put forward a dynamic model with extensive feasibility, Dupuy [37] developed that in situ NIR spectroscopy can be utilized to monitor the appearance/disappearance of the main reactive functions throughout the resin cure based on change of the peaks 4,790 cm -1 and 6,140 cm -1 so as to determine the NIR spectroscopy is able to instantly record the spectra for untreated solid and liquid samples in a creative and efficient manner and simultaneously confirm the physical and chemical parameters.…”

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

“…Estos méto-dos revelan que la cinética de curado de resinas UP es compleja debido a la cantidad de procesos de reacción que ocurre simultá-neamente. Sin embargo, el progreso de la reacción se ha estudiado de manera simple, teniendo en cuenta el mecanismo de radicales libres en dos fases, en la primera el iniciador se descompone quí-micamente, formando radicales libres; en la fase de propagación o polimerización, estos radicales libres reaccionan fácilmente con el estireno o con el poliéster, (Rouison et al, 2004;Vargas et al, 2012).…”