Polymer Bulletin

, Volume 70, Issue 11, pp 3201–3220 | Cite as

Synthesis and self-assembly properties of well-defined four-arm star poly(ε-caprolactone)-b-poly(N-vinylpyrrolidone) amphiphilic block copolymers

  • Avnish Kumar Mishra
  • K. Ramesh
  • Tapas Kumar Paira
  • Divesh N. Srivastava
  • Tarun Kumar Mandal
  • Nira Misra
  • Biswajit RayEmail author
Original Paper


Well-defined amphiphilic four-arm star diblock copolymers of poly(ε-caprolactone) (PCL) and poly(N-vinylpyrrolidone) (PNVP) have successfully been synthesized by combining the ring-opening polymerization (ROP) of ε-caprolactone (CL) and xanthate-mediated reversible addition-fragmentation chain transfer (RAFT) polymerization of N-vinylpyrrolidone (NVP). The resulting block copolymer shows the formation of spherical micelles in water as revealed by transmission electron microscopy (TEM) and supported by light-scattering study. The critical micellar concentration (cmc) value of the micelle increases with the increase in the PNVP block length. Hydrodynamic diameter distribution of the micelles decreases with the increase in the PNVP block length. The effective hydrodynamic ratio (R h) remains almost constant over the angles of scattering measurements above the corresponding cmc value. The usefulness of the synthesized star amphiphilic block copolymers was checked by the successful synthesis of silver nanoparticles.

Graphical abstract

Well-defined four-arm star poly(ε-caprolactone)-b-poly(N-vinylpyrrolidone) amphiphilic block copolymers are prepared by the combination of ring opening polymerization and xanthate-mediated reversible addition-fragmentation chain transfer polymerization and their self-assembly properties are studied using 1H NMR, fluorescence spectroscopy, dynamic light scattering, and TEM.


Silver Nanoparticles Block Copolymer Xanthate Amphiphilic Block Copolymer Star Block Copolymer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors gratefully acknowledge the financial support from the Department of Science and Technology, Government of India, through grant no. SR/S1/PC-25/2006. V.K.P., N.K.V., and A.K.M., acknowledge CSIR, Government of India for research fellowships.

Supplementary material

289_2013_1017_MOESM1_ESM.doc (56 kb)
Supplementary material 1 (DOC 56 kb)


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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Avnish Kumar Mishra
    • 1
  • K. Ramesh
    • 1
    • 2
  • Tapas Kumar Paira
    • 3
  • Divesh N. Srivastava
    • 4
  • Tarun Kumar Mandal
    • 3
  • Nira Misra
    • 2
  • Biswajit Ray
    • 1
    Email author
  1. 1.Department of Chemistry, Faculty of ScienceBanaras Hindu UniversityVaranasiIndia
  2. 2.School of Biomedical EngineeringIndian Institute of Technology, Banaras Hindu UniversityVaranasiIndia
  3. 3.Polymer Science UnitIndian Association for the Cultivation of ScienceKolkataIndia
  4. 4.Central Salt and Marine Chemicals Research Institute (CSIR)BhavnagarIndia

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