Abstract
The chemical composition, morphology and configuration of a series of solid lactide-glycolide copolymers (PLAXGAY: X, % l-lactide and Y, % glycolide) were studied by solid state 13C n.m.r., infra-red and Raman spectroscopy. Chemical composition was evaluated from the relative intensities of CH2 and CH carbon n.m.r. peaks and from the intensity ratio of δCH2 and δasCH3 bending Raman peaks. Relationships with GA% content were compared. Raman spectroscopy appeared more sensitive to the stereochemistry of copolymers than CP/MAS 13C n.m.r.. 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. In contrast, solid state 13C n.m.r. did not allow distinguishing the specific l- and d,l-LA unit distribution present in the terpolymers.
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