How does polymeric glass formation prevent flow of linear polymer? Explain Tg and chemical reasons. How...

How does polymeric glass formation prevent flow of linear polymer? Explain Tg and chemical reasons. How does this prevention of flow effect mechanical charcteristics?

Expert Solution

Polymer glass formation occurs at certain specified temperature for a given polymer and this transformation occurs without the formation of crystal solids through a process called glass transition. These transition into solids prevents the flow of linear polyme that lacks branching and dendritic structure and chains.

Glass transition temperature is the gradual and reversible transition in amorphous , non crystalline material from a relatively hard and brittle state to soft and viscous state.

Its prevention affects the mechanical properties in several ways :-

1. The material exhibits a step in thermal expansion coefficient and specific heat.

2. No phase change occurs and material becomes more viscous and semisolid in nature.

3. The stiffness of the polymers is also decreased as the glass transition temperature is reached.

samet mamat answered 2 years ago

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