Non-Covalent PS–SC–PI Triblock Terpolymers <i>via</i> Polylactide Stereocomplexation: Synthesis and Thermal Properties
نویسندگان
چکیده
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 non-covalent triblock terpolymers: polystyrene–SCPLA–polyisoprene (PS–SC–PI) via stereocomplexation PS-b-PDLA with PI-b-PLLA diblock through solution-precipitation method. The were prepared by combining anionic polymerization high-vacuum technique ring-opening (ROP). First, several well-defined ω-hydroxyl polystyrenes polyisoprenes (PS-OH PI-OH) varied molecular weights synthesized using sec-BuLi as initiator. PS-OH PI-OH used macroinitiators for ROP DLA LLA catalyzed tin(II) 2-ethyl hexanoate afford PI-b-PLLA. PS–SC–PIs mixing solutions (in dichloromethane) precipitated into methanol. characteristics determined 1H NMR spectroscopy size exclusion chromatography. formation was evidenced differential scanning calorimetry, X-ray diffraction, Fourier-transform infrared, circular dichroism spectroscopies. A preliminary study atomic force microscopy reveals thin-film phase behavior supramolecular organization PS–SC–PI.
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ژورنال
عنوان ژورنال: Macromolecules
سال: 2022
ISSN: ['0024-9297', '1520-5835']
DOI: https://doi.org/10.1021/acs.macromol.1c02294