Journal of Polymer Research

, 25:245 | Cite as

Preparation of a star-type telechelic macrophotoinitiator of poly(ε-caprolactone) and its use in photoinduced free radical promoted cationic polymerization

  • Zafer UyarEmail author
  • Adile Öncel


A novel and well-defined four-arm star-type telechelic macrophotoinitiator of poly(ε-caprolactone) carrying benzoin photofunctional end-groups (PCL-BPI)4 was successfully synthesized by the combination of ring opening polymerization (ROP) and click chemistry techniques. First, hydroxyl end-functionalized four-arm (PCL-OH)4 was synthesized by ROP of ε-caprolactone (ε-CL) with pentaerythritol initiator. Then, the hydroxyl groups at the chain ends were converted to terminal alkyne groups by the condensation reaction between (PCL-OH)4 and 4-pentynoic acid to give an alkyne end-functionalized four-arm poly(ε-caprolactone), (PCL-alkyne)4, as the first click couple compound. Separately, an azido end-functionalized benzoin photoinitiator (BPI-N3) was prepared in two steps to be used as the other click couple compound. (PCL-alkyne)4 and BPI-N3 were coupled via “click chemistry” to prepare a well-defined four-arm star-type telechelic macrophotoinitiator, (PCL-BPI)4. In addition, the obtained (PCL-BPI)4 macrophotoinitiator was used in the photoinitiated free radical promoted cationic polymerization of cyclohexene oxide (CHO) to produce an (AB)4-type star shaped block copolymer, (PCL-PCHO)4. All the polymers prepared were characterized by different spectral and analytical methods and their thermal behaviors were investigated.


Star-shaped Macrophotoinitiators Polyesters Telechelics Functionalization of polymers Photopolymerization Star-type copolymers 



The authors would like to thank Harran University, Scientific Research Council (HÜBAK) (Project no: 16054) for financial support and Prof Dr. Mustafa Degirmenci for the fruitful discussions during the experiments and the preparation of this paper.


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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Science Faculty, Department of ChemistryHarran UniversityŞanlıurfaTurkey

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