Degradation of Crystalline Residues

FIGURE 21.9 Mn change of PLLA crystalline residues during the course of hydrolytic degradation at pH 7.4 and different temperatures (a) [41, 62] and at 37°C and different pH (b) [42]. 

The melting temperature (Tm) of crystalline regions can be expressed as a function of the reciprocal of crystalline thickness (/c), that is, according to the Thomson-Gibbs equation given below [272]  

FIGURE 21.10 Tjn of crystallized PLLA films crystallized at different temperatures as functions of (L x [62], 

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