An effective route for ring-opening copolymerization of β-butyrolactone (BBL) with ε-decalactone (ε-DL) is reported. Microstructures of the block copolymers characterized by C NMR spectroscopy revealed syndiotactic-enriched poly(3-hydroxybutyrate) (PHB) blocks. Several di- and triblock copolymers (PDL--PHB and PDL--PHB--PDL, respectively) were successfully synthesized by sequential addition of the monomers using (salan)Y(III) complexes as catalysts. The results from MALDI-ToF mass spectrometry confirmed the presence of the copolymers. Moreover, thermal properties of the block copolymers were also investigated and showed that the microphase separation of PDL--PHB copolymers into PHB- and PDL-rich domains has an impact on the glass transition temperatures of both blocks.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6541034 | PMC |
| http://dx.doi.org/10.3389/fchem.2019.00301 | DOI Listing |
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