did not allow distinguishing the specific l- and d,l-LA unit distribution present in the terpolymers.
Compound 1 is composed of a binuclear La unit that connected by the partly deprotonated HNTB2 − ligand to afford a novel (3,12 -connected framework whose topology has not been reported so far.
Preferential degradation appeared in d,l-LA units in all the compounds.
These results demonstrate that introduction of LA units into the polymer chain effectively and stably inhibited the crystallization of 3HB units.
This could be explained by the fact that amorphous regions composed of mainly CL moieties degraded earlier than hard domains where most of the LA units were located.
It allowed discrimination of amorphous PLA42.5GA15 from PLA85GA15, and PLA37.5GA25 from PLA75GA25 based on the new band at ≈ 1334 cm−1 assigned to δCH bending modes relative to d-LA units.
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In particular PLLA blocks are amorphous for short lengths (≤672 g/mol, that means ≤9.3 LA repeat units) and start to crystallize for molecular weight ≥964 g/mol, that means ≥13.4 LA repeat units.
