Non-Covalent PS–SC–PI Triblock Terpolymers via Polylactide Stereocomplexation: Synthesis and Thermal Properties

Abstract
Polylactide (PLA) stereocomplexes (SCs) containing amorphous block copolymers have gained enormous interest due to their unique properties and wide range of potential applications. In this work, we report the synthesis and properties of non-covalent triblock terpolymers: polystyrene–SCPLA–polyisoprene (PS–SC–PI) via the stereocomplexation of PS-b-PDLA with PI-b-PLLA diblock copolymers through the solution-precipitation method. The diblock copolymers were prepared by combining the anionic polymerization high-vacuum technique with ring-opening polymerization (ROP). First, several well-defined ω-hydroxyl polystyrenes and polyisoprenes (PS-OH and PI-OH) with varied molecular weights were synthesized by anionic polymerization using sec-BuLi as the initiator. PS-OH and PI-OH were used as the macroinitiators for the ROP of DLA and LLA catalyzed by tin(II) 2-ethyl hexanoate to afford PS-b-PDLA and PI-b-PLLA. PS–SC–PIs were prepared by mixing PS-b-PDLA and PI-b-PLLA solutions (in dichloromethane) and precipitated into methanol. The molecular characteristics of the block copolymers were determined by H NMR spectroscopy and size exclusion chromatography. The formation of PS–SC–PIs was evidenced by differential scanning calorimetry, X-ray diffraction, and Fourier-transform infrared, and circular dichroism spectroscopies. A preliminary study by atomic force microscopy reveals the thin-film phase behavior and the supramolecular organization of the PS–SC–PI.

Citation
Ladelta, V., Ntetsikas, K., Zapsas, G., & Hadjichristidis, N. (2022). Non-Covalent PS–SC–PI Triblock Terpolymers via Polylactide Stereocomplexation: Synthesis and Thermal Properties. Macromolecules. https://doi.org/10.1021/acs.macromol.1c02294

Acknowledgements
Research reported in this publication was supported by the King Abdullah University of Science and Technology (KAUST).

Publisher
American Chemical Society (ACS)

Journal
Macromolecules

DOI
10.1021/acs.macromol.1c02294

Additional Links
https://pubs.acs.org/doi/10.1021/acs.macromol.1c02294

Permanent link to this record