Abstract
Benzoin (B) end-chain functional macrophotoinitiator of poly(d,l-lactide) homopolymer (B-PDLLA) and poly(ε-caprolactone)-poly(d,l-lactide) (B-PCL-b-PDLLA) diblock copolymer with controlled molecular weights and low polydispersities have been synthesized via ring-opening polymerization (ROP). The ROP of d,l-lactide with benzoin as the initiator and tin octoate (Sn(Oct)2) as the catalyst in bulk at 130 °C formed B-PDLLA polymer. B-PCL-b-PDLLA was synthesized by sequential ROP in two steps. Benzoin (B) end-chain functional macrophotoinitiator of poly(ε-caprolactone) (B-PCL) was first prepared via ROP of ε-caprolactone by using benzoin/Sn(Oct)2 initiating system. The resultant hydroxyl-terminated B-PCL macrophotoinitiator was subsequently utilized as the macroinitiator in the second-step ROP of d,l-lactide to synthesize B-PCL-b-PDLLA. The 1H NMR, FT-IR, GPC, UV, and fluorescence spectroscopic studies revealed that low-polydispersity poly(d,l-lactide) homopolymer and poly(ε-caprolactone)-poly(d,l-lactide) diblock copolymer with benzoin end-groups were obtained. These macrophotoinitiators were used as prepolymers in photoinitiated free radical promoted cationic polymerization for obtaining AB type di- and ABC type tri-block copolymers.
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The authors would like to thank Harran University, Scientific Research Council (HÜBAK) for financial support (Project no: 14021).
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Degirmenci, M., Benek, N. & Durgun, M. Synthesis of benzoin end-chain functional macrophotoinitiator of poly(d,l-lactide) homopolymer and poly(ε-caprolactone)-poly(d,l-lactide) diblock copolymer by ROP and their use in photoinduced free radical promoted cationic copolymerization. Polym. Bull. 74, 167–181 (2017). https://doi.org/10.1007/s00289-016-1706-3
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DOI: https://doi.org/10.1007/s00289-016-1706-3