6380
Time - temperature superposition ( TTS ) phenomena observed for amorphous synthetic polymers have been utilised to generate master curves of viscoelasticity , which afforded rationalisation of results on the basis of the free volume theory .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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