Explain why plasticizers increase flexibility and elongation in plastics. What is the relationship between plasticizers and the glass transition temperature?
What will be an ideal response?
Plasticizers are solvents that are added to swell and partially solvate the polymer. By swelling the polymer the plasticizer expands the polymer network and, therefore, allows the polymer atoms to move more freely. This greater mobility is seen as increased polymer flexibility and elongation. Raising the temperature above the glass transition temperature has the same general effect. Therefore, adding a plasticizer lowers the glass transition temperature.
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