Combining thio-bromo Click chemistry and raft polymerization: a powerful tool for preparing functionalized multiblock and hyperbranched polymers
MetadataShow full item record
An experiment was conducted to prove that RAFT-prepared polymers can serve as convenient masked macromolecular thiols suitable for thio-bromo reactions. Homopolymers were prepared by RAFT polymerization using 4-cyanopentanoic acid dithiobenzoate (CPADB) as the chain transfer agent, yielding homopolymers with dithiobenzoate groups at the ?-termini that can be readily cleaved to thiols through aminolysis. The aminolysis of PMA4500 in the presence of MBP was performed using hexylamine/triethylamine (TEA) as the cleavage agent and base, respectively, in a molar ratio PMA4500/hexylamine/TEA/MBP=1/1/2/2 in acetonitrile at a concentration of 0.027 mol/L. A small shift to lower retention time was observed for the MBP modified PMA4500. The appearance of a small fraction of coupled products compared to the parent PMA4500 homopolymer. PMA1000 was aminolyzed in the presence of MBP or EBiB and the products analyzed by ESI mass spectrometry (MS) to verify successful cleavage/thioether formation.
Showing items related by title, author, creator and subject.
Wong, Yih Han (2014)Design of Experiments was applied in this study to identify the effects of interaction between environmental conditions on Chlorella vulgaris growth in flat panel photo-bioreactors. Three mathematical regression models ...
Phase Behaviour, Fluid Properties and Recovery Efficiency of Immiscible and Miscible Condensate Displacements by SCCO2 Injection: Experimental InvestigationAl-Abri, Abdullah; Amin, Robert (2010)This paper presents a quantitative investigation of the interfacial tension dependent relative permeability (IFT-DRP) and displacement efficiency of supercritical CO2 injection into gas-condensate reservoirs. A high-pressure ...
Abbo, S.; Shtienberg, D.; Lichtenzveig, Judith; Lev-Yadun, S.; Gopher, A. (2003)The widely accepted models describing the emergence of domesticated grain crops from their wild type ancestors are mostly based upon selection (conscious or unconscious) of major features related either to seed dispersal ...