Lower Critical Solution Temperature Behavior of Comb and Graft Shaped Poly(oligo(2-ethyl-2-oxazoline)methacrylate)s
Lower Critical Solution Temperature Behavior of Comb and Graft Shaped Poly(oligo(2-ethyl-2-oxazoline)methacrylate)s
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DOI：
10.1021/ma8028437
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发表时间：
2009-03
期刊：
影响因子：
5.5
通讯作者：
Christine Weber;C. R. Becer;R. Hoogenboom;U. Schubert
中科院分区：
文献类型：
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作者：
Christine Weber;C. R. Becer;R. Hoogenboom;U. Schubert
采用大分子单体法合成了具有低临界溶解温度（LCST）行为的梳型和接枝型聚合物，该聚合物以亲水性低聚（2-乙基-2-恶唑啉）侧链和疏水性甲基丙烯酸酯主链为基础。采用原位生成的甲基丙烯酸三乙铵对活性低聚（2-乙基-2-恶唑啉）链进行直接封端，得到了结构明确的低聚（2-乙基-2-恶唑啉）甲基丙烯酸酯（OEtOxMA）大分子单体。随后使用可逆加成-断裂链转移（RAFT）聚合技术以受控方式聚合大分子单体，得到一系列具有不同侧链长度和主链长度的梳形聚合物。此外，通过使OEtOxMA与甲基丙烯酸甲酯（MMA，40 - 80摩尔%）共聚来制备一系列接枝共聚物。共聚物，其特征在于通过1H NMR光谱，尺寸排阻色谱法（SEC），并部分地，通过基质辅助激光解吸电离（MALDI-TOF）质谱。LCST行为...
Comb and graft polymers with lower critical solution temperature (LCST) behavior based on hydrophilic oligo(2-ethyl-2-oxazoline) side chains and a hydrophobic methacrylate backbone were synthesized using the macromonomer method. Well-defined oligo(2-ethyl-2-oxazoline) methacrylate (OEtOxMA) macromonomers were obtained by direct end-capping of living oligo(2-ethyl-2-oxazoline) chains with in situ formed triethylammonium methacrylate. The macromonomers were subsequently polymerized in a controlled manner using the reversible addition−fragmentation chain transfer (RAFT) polymerization technique yielding a series of comb polymers with varying side chain length and backbone length. In addition, a series of graft copolymers were prepared by copolymerizing OEtOxMA with methyl methacrylate (MMA, 40−80 mol %). The copolymers were characterized by 1H NMR spectroscopy, size exclusion chromatography (SEC), and, partially, by matrix-assisted laser desorption ionization (MALDI-TOF) mass spectrometry. The LCST behavior ...