Abstract
A series of oligomers for use as a biodegradable aliphatic polyester model compounds such as poly(dodecamethylene dodecanedioate) (C12-n) and poly(tetradecamethylene tetradecanedioate) (C14-n) were synthesized. C12-n and C14-n were separated by a silica gel column, and pure n-mers were obtained. The melting enthalpies and entropies of n-mers were observed to follow a linear equation in terms of n. The equilibrium melting temperatures of C12-n and C14-n obtained from ΔH/ΔS were 104 °C and 108 °C, respectively. We can easily calculate the approximate equilibrium melting temperature of aliphatic polyesters (Cm) using Tm0=411(m−2.48)/(m−1.59).
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