Polymer Technology
__________ are produced by reacting polybasic acid (e.g. phthalic anhydride) with polyhydric alcohol (e.g., glycerol).

Alkyd resins
Unsaturated polyester
Saturated polyester
Amino resins

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Polymer Technology
Synthetic rubber

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

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