Libraries of Methacrylic Acid and Oligo(ethylene glycol) Methacrylate Copolymers with LCST Behavior
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Becer, C. Remzi; Hahn, Sabine; Fijten, Martin W. M.; Thijs, Hanneke M. L.; Hoogenboom, Richard; Schubert, Ulrich S.
- Abstract:
- Homopolymers of methacrylic acid (MAA), monoethyleneglycol methyl
ether methacrylate (MEOMA), diethyleneglycol methyl ether methacrylate
(MEO2MA), oligo(ethyleneglycol) methyl ether methacrylate (OEGMA475 and
OEGMA1100) and oligo(ethyleneglycol) ethyl ether methacrylate (OEGEMA246) were
synthesized with various chain lengths via reversible addition fragmentation chain
transfer (RAFT) polymerization. The homopolymers of MAA, MEOMA and
OEGMA1100 did not show any cloud point (CP) in the range of 0–100 C, whereas at
a pH value of 7, the CPs were found to be 20.6, 93.7, and 20.0 C for p(MEO2MA),
p(OEGMA475) and p(OEGEMA246), respectively, with an initial monomer to initiator
ratio of 50. Furthermore, statistical copolymer libraries of MAA with OEGMA475 and
OEGMA1100 were prepared. The cloud points of the random copolymers of MAA and
OEGMA475 were found to be in the range of 20–90 C; surprisingly, even though the
homopolymers of MAA and OEGMA1100 did not exhibit any LCST behavior, the
copolymers of these monomers at certain molar ratios (up to 40% OEGMA1100)
revealed a double responsive behavior for both temperature and pH. Finally, the
cloud points were found to be in the range of 22–98 C, measured at pH values of 2,
4, and 7, while no cloud point was detected at pH 10.
- Year:
- 2008
- Type of Publication:
- Article
- Keywords:
- controlled polymerization; copolymerization; high-throughput experimentation; lower critical solution temperature; methacrylic acid; oligo ethyleneglycol; radical polymerization; reversible addition fragmentation chain transfer RAFT
- Journal:
- Journal of Polymer Science: Part A: Polymer Chemistry
- Volume:
- 46
- Pages:
- 7138 - 7147