Definition of Amorphous

The polymers exist in two morphological states i.e. amorphous and semi-crystalline. The orientation of the molecules in amorphous polymers is random and the molecules are loosely packed and they are in a twisted form. In contrast, the semi-crystalline in which the molecules are present in the perfect order and are linked to each other tightly. The physical appearance of the polymer is transparent and glass-like.

When the temperature is low, the molecules present in the amorphous polymer tend to vibrate at very low energy. In this way, they are converted into a solid form which is known as the glassy state of the polymer. And when the temperature is increased, the rubber state is achieved due to the vigorous vibrations of the molecules.