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Published on: November 21, 2017
Highly Isoselective Ring-Opening Polymerization of rac-β-Butyrolactone: Access to Synthetic Poly(3-hydroxybutyrate)
Jonas Bruckmoser1, Stefanie Pongratz1, Lucas Stieglitz1
1Catalysis Research Center, Department of Chemistry, Technical University of Munich, 85748 Garching, Germany.
Abstract:
We report the highly isoselective ring-opening polymerization (ROP) of racemic β-butyrolactone (β-BL) using in situ-generated catalysts based on Y[N(SiHMe2)2]3(THF)2 and salan-type pro-ligands. The catalyst system produces isotactic poly(3-hydroxybutyrate) (PHB) with record productivity (TOF up to 32 000 h-1) and the highest isoselectivity (Pm up to 0.89) in ROP of β-BL achieved to date. In contrast to bacterial PHB, the chemically synthesized PHB has beneficial material properties, such as increased melt processing window attributed to a lowered melting temperature (Tm ≈ 140 °C) and drastically reduced brittleness. The produced PHB showed an elongation at break of 392%, thus demonstrating promising polyolefin-like thermomechanical material properties.
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