Metal-Free Synthesis of Responsive Polymers: Cloud Point Tuning by Controlled ‘‘Click’’ Reaction
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Becer, C. Remzi; Kokado, Kenta; Weber, Christine; Can, Aydın; Chujo, Yoshiki; Schubert, Ulrich S.
- Abstract:
- Nitroxide-mediated radical polymerization has been
used for the preparation of pentafluorostyrene (PFS) homopolymers
and random copolymers of PFS and oligo(ethyleneglycol)
methacrylate (OEGMA8.5). The poly(pentafluorostyrene)
homopolymers were reacted with thiophenol at different ratios
at room temperature in the presence of triethylamine. The
‘‘clicked’’ polymers were characterized by 1H and 19F NMR
spectroscopy and size exclusion chromatography. Moreover,
the copolymerization kinetics of the PFS and OEGMA8.5 copolymers
was followed, and the phase transition behavior of random
copolymers with different compositions was discussed.
Furthermore, copolymers of PFS and 2-(dimethylamino) ethyl
methacrylate (DMAEMA) were prepared at various mole ratios,
and the copolymer with a 10:90 ratio, respectively, was soluble
in water at room temperature. Turbidimetry measurements were performed for PFS and OEGMA8.5 or DMAEMA copolymers
to determine their cloud points. Finally, the PFS and
OEGMA8.5 copolymer with a mole ratio of 60:40 was reacted
further with thiophenol to increase the hydrophobic part in the
copolymer. The cloud points of the obtained copolymers could
be tuned from 87 to 33 C by using not only the controlled radical
polymerization but also the ‘‘click’’ reaction in a controlled
fashion.
- Year:
- 2010
- Type of Publication:
- Article
- Keywords:
- controlled radical polymerization; fluoropolymers; living polymerization; lower critical solution temperature; metal-free click reaction; stimuli-responsive polymers; stimulisensitive polymers
- Journal:
- Journal of Polymer Science: Part A: Polymer Chemistry
- Volume:
- 48
- Pages:
- 1278 - 1286