Polymer Technology
Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is

Ni
Aluminium triethyl combined with titanium tetrachloride
Fe
V₂O₅

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Polymer Technology
Synthetic rubber

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

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