Polymer Technology
Polyesters are manufactured by the polycondensation reaction of

Inorganic acid with ethylene glycol
Carboxylic acid with ethylene
A single monomer
Dibasic acid with dihydric alcohol

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Polymer Technology
Synthetic rubber

Is softer at higher temperature
Deforms, if stretched to double of its original dimension
Is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases
Is brittle at low temperature

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