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Related Experiment Video

Updated: Jun 13, 2026

Fabrication of Large-area Free-standing Ultrathin Polymer Films

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Published on: June 3, 2015

Solvent Evaporation-Controlled Stereocomplexation in PLLA/PDLA Films for Sustainable Packaging.

Yottha Srithep¹, Tamilselvan Mohan², Arissara Phosanam³

¹Manufacturing and Materials Research Unit, Department of Manufacturing Engineering, Faculty of Engineering, Mahasarakham University, Mahasarakham 44150, Thailand.

|June 12, 2026

Summary

Controlling solvent evaporation in poly(L-lactide)/poly(D-lactide) (PLLA/PDLA) blends significantly enhances stereocomplex crystallite formation. This improves biodegradable film properties, offering a practical strategy for advanced packaging solutions.

Keywords:

PLLA/PDLA blends barrier properties biodegradable polymers crystallization behavior microbial resistance solvent evaporation stereocomplex polylactide

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Area of Science:

Polymer Science
Materials Science
Biomaterials Engineering

Background:

Stereocomplex (SC) crystallites in poly(L-lactide) (PLLA)/poly(D-lactide) (PDLA) blends offer enhanced performance for biodegradable polymer films.
Controlling crystallization is key to optimizing the properties of these advanced materials.

Purpose of the Study:

To investigate the impact of solvent evaporation kinetics on the crystallization, microstructure, and properties of PLLA/PDLA blend films.
To correlate structural changes with functional property improvements for biodegradable packaging applications.

Main Methods:

Preparation of PLLA/PDLA blend films under varying solvent evaporation rates (fast vs. slow).
Characterization using Differential Scanning Calorimetry (DSC), Wide-Angle X-ray Diffraction (WAXD), and Small-Angle X-ray Scattering (SAXS).

Main Results:

Slow solvent evaporation significantly promotes stereocomplex formation, especially in equimolar blends (50:50 PLLA/PDLA).
Optimized films showed higher crystallinity and a more compact structure.
Substantial reduction in water vapor permeability (~86%) and microbial growth was observed in stereocomplex-rich films.

Conclusions:

Solvent evaporation kinetics is a critical factor in controlling stereocomplex formation and microstructure in PLLA/PDLA blends.
The enhanced barrier properties and reduced microbial proliferation are linked to the dense packing of stereocomplex crystallites.
This study provides a practical strategy for developing high-performance biodegradable packaging films by tuning structure-property relationships.