Greeting, currently working mixing of thermoset and thermoplastic polymer to from a coating. I would like to study in term of diffusion either both material miscible or immiscible between these two material. Based on my reading, it can be calculate using Flory Hugging diffusion theory but I do not have any example or complete references to study. Is there any suggestion that can be used so that i can study on the diffusion of these two different polymer instead of imaging (SEM) because it can be seen through morphology. I would like to prove in theoretical/calculation for my study. Thermoset that I used is unsaturated polyester while thermoplastic is thermoplastic polyurethane. Thankyou
Young people almost always set tasks that are considered unsolvable. Sometimes they succeed. Thermoplastics and thermosetting resins with such different natures do not mix, do not dissolve in each other. I understood the physics of the process as a whole from your question. But I do not risk offering you my interpretation in the absence of information, so that my answers are impeccable from the point of view of true science. Go ahead, you feel the presence of scientific intuition.
In the co-bonding of thermoset and thermoplastic polymers, the interdiffusion of the polymers results in the formation of an interphase between them. The dependence of the gelation time on the initiator concentration is determined by rheometer measurements. Differential scanning calorimetry measured the speed of cure. The interphase thickness of the co-bonded polymers is measured with an optical microscope.
Thermoplastic (TP) polymer is bonded with thermoset polymer through a curing reaction of the thermoset resin. Although co-bonding may refer to the bonding of two parts with or without an adhesive between them.
It is of the utmost importance to investigate the influence of the aforementioned parameters on the TP-TS interphases. the effect of initiator concentration on the interphase morphology, which is crucial for the co-bonded parts, the gelation time of the resin at different initiator concentrations is measured and DSC tests are conducted to determine the cure behavior (cure speed and degree of cure).
To investigate the diffusion kinetics, the diffusivity of the mixtures is calculated based on Fick’s second law of diffusion using the measured interphase thicknesses and gelation times. DSC peak started and reached its maximum must have obtained to investigate the speed of curing. In addition, to gain more insight into the cure behavior, the heat and degree of cure can be calculated, the method used for controlling the interphase thickness by varying the initiator concentration paves the way for investigating the effect of interphase thickness on the processing-induced deformations of the co-bonded TP-TS composites.
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