Processing Polymers

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Crystallinity in polymers

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Increases density and strength of plastic.

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Examples of polymers

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Rubber, polyurethane, polystyrene.

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Polymer chain entanglement

Back

Occurs more readily with longer chains.

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Cross-linking in polymers

Back

Increases hardness and rigidity.

Front

Chemical processes in polymers

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Employed to form and adjust polymer properties.

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Increasing polymer chain length

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Improves tensile strength.

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Density of plastic

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Can be increased by crystallinity.

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Injection Moulding Process

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A manufacturing process where raw material is heated and compressed into a liquid, then injected into a mould.

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Injection of Plastic

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Fluid plastic is forced into the mould under pressure.

Front

Role of Pressure

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Pressure and injection pressure are crucial for successful moulding.