Following of the relaxations in a polymer's behavior part I: “Correlation diagram” and creep at linearly increasing temperature

The correlation diagram is introduced here in order to follow the different relaxations of polymers. Two examples will be presented: PMMA and wood at several moisture contents between 20 and 100°C. For the two materials, an experiment of creep at linearly increasing temperature is proposed, so as to point out the relaxations of the different components for low frequencies. In this experiment, a relaxation induces a maximum of creep kinetic. The movement of the temperatures of relaxation with the moisture content will be observed. For wood at high moisture content (near the fiber saturation point), the cellulose's relaxation of the reinforcements will be observed at high temperature.