Sub-10 nm Nano-Organization in AB2- and AB3-Type Miktoarm Star Copolymers Consisting of Maltoheptaose and Polycaprolactone
Citations Over TimeTop 10% of 2013 papers
Abstract
The AB2- and AB3-type miktoarm star copolymers consisting of maltoheptaose (MH, as A block) and poly(ε-caprolactone) (PCL, as B block), namely MH-b-(PCL)2 and MH-b-(PCL)3, were synthesized, and their nano-organization was characterized. The syntheses of MH-b-(PCL)2 and MH-b-(PCL)3 were carried out through two reaction steps: (1) preparation of linear and three-branched PCLs bearing an azido group on the chain center (N3-(PCL)2 and N3-(PCL)3) by the diphenyl phosphate-catalyzed ring-opening polymerization of ε-caprolactone (ε-CL) using azido-functionalized di- and triols (N3-(OH)2 and N3-(OH)3) as the initiators and (2) the copper-catalyzed azide–alkyne cycloaddition of N3-(PCL)2 and N3-(PCL)3 with the ethynyl-functionalized MH. The miktoarm star copolymers having Mn for the PCL block of ca. 5000 (MH-b-(PCL2.5k)2 and MH-b-(PCL1.7k)3) and 10 000 (MH-b-(PCL5k)2 and MH-b-(PCL3.3k)3) were obtained with a very narrow polydispersity index of less than 1.05. Bulk samples of the four types of miktoarm star copolymers exhibited body-centered cubic phases, as determined by small-angle X-ray diffraction experiments. The domain-spacing were determined to be 9.8 nm for MH-b-(PCL2.5k)2, 8.8 nm for MH-b-(PCL1.7k)3, 10.5 nm for MH-b-(PCL5k)2, and 9.8 nm for MH-b-(PCL3.3k)3, which were smaller than those of the corresponding linear diblock copolymers.
Related Papers
- → Synthesis of well-defined carboxyl poly(ε-caprolactone) by fine-tuning the protection group(2016)24 cited
- → Organic catalyst for ring opening polymerization of ε‐caprolactone in bulk. Route to starch‐graft‐polycaprolactone(2010)30 cited
- → Research Progress of Ring-opening Polymerization of ε-caprolactone Initiated by Degradable Biopolymers(2020)5 cited
- Progress on Synthesis and Application of Polycaprolactone(2006)
- THE SYNTHESIS OF POLYMERIZATION OFε-CAPROLACTONE(2002)