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Raman structural analysis of lactide and ε-caprolactone linear oligomers and their blends
S O Liubimovskii1, L Yu Kozlova1, A M Semin2
1Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov St. 38, 119991 Moscow, Russia.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|November 15, 2025
Summary
Raman spectroscopy effectively analyzes lactide and caprolactone oligomers and their blends. This method aids in developing new materials for 3D printing, drug delivery, and tissue engineering.
Area of Science:
- Polymer Chemistry
- Spectroscopy
- Materials Science
Background:
- Linear oligomers of L-lactide (L-OLA), D,L-lactide (D,L-OLA), and ε-caprolactone (OCL) are crucial building blocks for advanced materials.
- Characterizing these oligomers and their blends is essential for controlling material properties.
- Previous Raman methods developed for polylactide (PLA) and copolymers need adaptation for oligomers and blends.
Purpose of the Study:
- To extend and validate Raman spectroscopy methods for analyzing linear lactide and caprolactone oligomers and their blends.
- To assess the applicability of Raman spectroscopy for determining crystallinity and composition in these systems.
- To establish a Raman-based method for estimating the degree of polymerization (DP) of the oligomers.
Main Methods:
- Raman spectroscopy was employed to study linear oligomers of L-OLA, D,L-OLA, and OCL with varying degrees of polymerization (DP 10-100).
- Existing Raman methods for neat PLA and PLA/PCL copolymers were adapted for oligomers and their blends.
- Intensity ratios of specific Raman bands (1,12-dodecanediol and OLA) were correlated with DP for oligomers up to DP 40-50.
Main Results:
- The Raman method for evaluating crystallinity was successfully applied to L-OLA oligomers.
- The Raman method for composition evaluation was extended to OLA/OCL blends and PLA/PCL blends.
- A correlation between Raman band intensity ratios and DP was established for oligomers synthesized using 1,12-dodecanediol.
Conclusions:
- Raman spectroscopy is a versatile tool for characterizing lactide and caprolactone oligomers and their blends.
- The validated Raman methods enable precise analysis of crystallinity and composition.
- These findings support the development of novel materials for applications in 3D printing, drug delivery, and tissue engineering.
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