Journal
JOURNAL OF POLYMER RESEARCH
Volume 18, Issue 6, Pages 1821-1827Publisher
SPRINGER
DOI: 10.1007/s10965-011-9589-3
Keywords
Free radical polymerization; Living/controlled radical polymerization; RAFT polymerization; Optical monomers; Dilatometry
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Funding
- VIEP-BUAP [PEZM-NAT10-G, SOMJ-NAT10-I]
- PROMEP [PTC-200]
- CONACYT
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Optically active polymers were prepared using reversible addition-fragmentation chain transfer polymerization (RAFT) of N-(S)-alpha-methylbenzylmethacryloylamine (N-(S)-alpha-MBMA), a functional optically active monomer. RAFT polymerizations were carried out at 70 A degrees C in ethanol using AIBN as a thermal initiator and benzyl or (1-phenyl)ethyl dithiobenzoate (BDB and PEDB, respectively) as the RAFT agents. The kinetic study was performed by dilatometry. Plots of conversion vs time indicated that the polymerizations followed first order kinetics. (1)H NMR, IR, and UV-vis spectrophotometric studies confirmed the presence of thiocarbonylthio moieties (-SCS-) in the polymer chains. The molecular weight distributions (MWDs) were moderately narrow with polydispersity indices between 1.3 and 1.6, which indicated that the control of the reaction was not completely achievement using BDB or PEDB as RAFT agents. The optical activity [alpha] (D) (25) measurements of synthesized polymers by RAFT did not show a noticeably linear increase dependence with respect to molecular weight, as was previously reported for another controlled free radical polymerization (CRP) system.
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