1- Terephthalic acid.
3 - Ethylene glycol.
When acid and alcohol get reacted in a vacuum at very high temperatures. The polythene terephthate results in condensation polymerization. Once the polymerization has occurred the material is extruded onto a casting trough in the form of a ribbon. When the polymer gets cool, the polymer ribbon gets hardened. Now this is cut into polymer chips.
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