Jamming occurs when a system develops a yield stress behaves as a solid in a disordered state

and it governs the transition behavior of foams

emulsions

colloidal suspensions

pastes

granular media and molecular glasses.For polymer glasses

when the interchain proximity was enlarged

the weak interaction between polymer chains was decreased

and these loosely packed chains can flow solely by applying pressure at temperature 132 degrees below their calorimetric glass transition temperature

Tg

which means Tg decreased to a great extent in this progress.This phenomenon is connected to the concept jamming

which suggests the generality of an idea that one can take polymer glasses through solid-to-liquid transition by thermalization

through temperature

or by a load.It is expected within the jamming picture that we could process polymers at lower temperature or even at room temperature.