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Glass transition (T g ) and melting (T m ) temperatures of aliphatic and aromatic esters of amylose have been measured. As the chain length of pendent group is increased both T g and T m get decreased. An average value of T g /T m ≃0.8 obtained for these esters, showed that they are moderately less flexible unsymmetrical polymers. Heat of fusion (ΔH f ) for the esters has been calculated. In the case of aliphatic esters, it has been found that as the chain length of pendent group is increased, the heat of fusion is decreased.
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Desai et al. (1973) studied this question.
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