The emulsion has a high glass transition temperature, but its glass transition temperature should be less than room temperature, so how to detect?
Most polymer materials are usually in the following four physical states (or mechanical states): glassy state, viscoelastic state, high elastic state (rubbery state), and viscous flow state. When the temperature is low, the material is a rigid solid. Similar to glass, only a very small deformation occurs under the action of external force. This state is the glass state: when the temperature continues to rise to a certain range, the deformation of the material is obvious. Increase, and the deformation is relatively stable in a certain temperature range, the state is high elastic state, the temperature continues to increase, the shape variable gradually increases, and the material gradually becomes a viscous fluid. At this time, the deformation is impossible to recover. It is a fluid flow state. The glass transition is a transition between the glass state and the high elastic state. From the molecular structure, the glass transition temperature is a relaxation phenomenon in which the amorphous portion of the polymer is frozen from the frozen state.
The glass transition temperature is mainly for solids. The emulsion can be solidified first to form a solid (latex particles), and then the temperature rise observation should be the glass transition temperature of the latex particles.
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