Pvc Plastisol Lab Report

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Figs. 1, 2, and 3 show that the PVC plastisols prepared from S2, S3, and S5 seed-emulsion paste resins, respectively, have basically consistent trends of rheological property curves, namely, the change in the complex viscosity (η) exhibit a non-normal distribution trend, i.e., the η first decreases, and then changes from slow increasing to rapid increasing, forming a shoulder peak and reaching to a maximum value, then decreases gradually. Overall, the rheological curve can be divided into four stages: The first stage is the decrease in viscosity with increasing temperature. In the stage, the system exhibits a suspension system with plasticizer as a continuous phase, and there is no interaction between PVC particles. The second stage: the η of plastisol begins to increase but with a relatively lower speed. In the stage, the PVC particles dissolve and begin to swell. The third stage, the η increases rapidly with further increase in temperature, forming a shoulder peak and the maximum value at a certain moment. In the fourth stage, the η gradually decreases, indicating that the system enters into the fusion stage. These processes are consistent with the…show more content…
The resin particles further swell and form gels. The continuous phase gradually disappears, and the complex viscosity increases rapidly. These two processes are ongoing with different extents: in the one aspect, the viscosity of the gel part begins to decrease; in the other aspect, a large amount of polymer phase incorporating from the core of PVC particles needs gelation, thereby increasing the viscosity of the system. The two processes overlap with different extents, leading to a maximum value and the shoulder peak on the viscosity curve of system. Fig. 5 shows that with increasing storage time, the ηmax of S2, S3, and S5 does not exhibit large difference (Fig. 5(a)); in general, the gelation velocity has the following sequence S5>S2>S3 (Fig.

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