Glasses information from combined

Figure 3.25 shows the changes of heat capacity with temperature for the polyepichlorohydrin (PECH)/poly(vinyl acetate) (PVAc) combination at different diffusion times. In the glass transition region, the heat capacity traces are different for the different diffusion times.However, it is difficult to draw out more detailed information from these traces. The dCp/dT curves, however, clearly showed that an interface is formed by thermal diffusion, (see Figure 3.26). This is shown by the increase in the dCp/dT signal between the two glass transitions. With increasing diffusion time, the concentration of the interface will change and its thickness will increase.

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