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observed that A-B-A triblock 7 displayed a comparable
Young’s modulus to the PCL homopolymer but with a vastly
superior elongation before failure with no observable
“necking.” The point of plastic deformation of triblock 8 (17
MPa) was also found to be superior to that of the PCL homo-
polymer (14 MPa).
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CONCLUSIONS
In conclusion, it was found that the utilization of the bifunc-
tional organocatalytic system of DBU/TU in the ROP of PTO
yielded well-defined homopolymers, free of any adverse side
reactions, even at monomer conversions >90%. Using the
well-controlled ROP system, it was possible to synthesise high
Tg poly(carbonate)s, which could be further used in degradable
biomaterials. As an example of such materials, the synthesis of
PPTO-PCL-PPTO triblock copolymers were investigated and
shown to yield a thermoplastic “hard-soft” material that dis-
plays superior tensile properties to the corresponding PCL
homopolymer while retaining its low thermal processing tem-
peratures. The ROP of pentaerythritol-based cyclic carbonates
offers a simple synthetic route into degradable high Tg poly-
mers for utilization in improving the tensile properties of low
Tg poly(ester)s through micro-phase separation.
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ACKNOWLEDGMENTS
Lubrizol Corporation and the University of Warwick are
thanked for funding to support the studentship (R.B.). The
Royal Society are acknowledged for funding an Industrial Fel-
lowship to A.P.D.
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