An Efficient Avenue to Poly(styrene)-block-poly(epsilon-caprolactone) Polymers via Switching from RAFT to Hydroxyl Functionality: Synthesis and Characterization

作者：Schmid Christina; Falkenhagen Jana^*; Barner Kowollik Christopher

来源：Journal of Polymer Science Part A: Polymer Chemistry , 2011, 49(1): 1-10.

DOI：10.1002/pola.24299

• 2D-liquid chromatography
• end group transformation
• LACCC-SEC
• reversible addition fragmentation chain transfer
• ring-opening polymerization
• soft ionization mass spectrometry

The recently introduced procedure of quantitatively switching thiocarbonyl thio capped (RAFT) polymers into hydroxyl terminated species was employed to generate narrow polydispersity (PDI approximate to 1.2) sulfur-free poly(styrene)-block-poly(epsilon-caprolactone) polymers (26,000 <= M-n/g.mol(-1) < 45,000). The ring-opening polymerization (ROP) of L.-caprolactone (epsilon-CL) was conducted under organocatalysis employing 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD). The obtained block copolymers were thoroughly analyzed via size exclusion chromatography (SEC), NMR, as well as liquid adsorption chromatography under critical conditions coupled to SEC (LACCC-SEC) to evidence the block copolymer structure and the efficiency of the synthetic process. The current contribution demonstrates that the RAFT process can serve as a methodology for the generation of sulfur-free block copolymers via an efficient end group switch.

• 出版日期2011-1-1