Thermoreversible supramacromolecular ion gels via hydrogen bonding
Thermoreversible supramacromolecular ion gels via hydrogen bonding
复制标题
DOI：
10.1021/ma800739c
复制
发表时间：
2008-07
期刊：
影响因子：
5.5
通讯作者：
Atsushi Noro;Y. Matsushita;T. Lodge
中科院分区：
文献类型：
--
作者：
Atsushi Noro;Y. Matsushita;T. Lodge
我们报道了一种超分子离子凝胶的热可逆粘弹性。使用两个结构单元形成“超大分子”。阿坝三嵌段共聚物（Mn = 50 000，聚（2-乙烯基吡啶）-b-聚（丙烯酸乙酯）-b-聚（2-乙烯基吡啶））（P2 VP-PEA-P2 VP），其摩尔比为0.1/0.8/0.1作为遥爪聚合物，和聚（4-羟基苯乙烯）（PHS）均聚物，其Mn = 6600作为连接体，通过P2 VP和PHS之间的氢键形成物理凝胶。热稳定的疏水离子液体1-乙基-3-甲基咪唑鎓双（三氟甲基磺酰基）酰亚胺（EMITFSI）为PEA提供了从室温至至少160 °C的良好溶剂介质。含有10重量% P2 VP-PEA-P2 VP和4% PHS的溶液在高温下为液体，但在冷却时在141.5 °C下形成网络。在30 ~ 160 °C温度范围内，动态剪切模量随频率的变化曲线可以叠加形成良好的主曲线，其平台模量明显超过160 ° C。
We report the thermoreversible viscoelastic properties of a supramolecular ion gel. Two building blocks were used to form “supramacromolecules”. An ABA triblock copolymer (Mn = 50 000, poly(2-vinylpyridine)-b-poly(ethyl acrylate)-b-poly(2-vinylpyridine)) (P2VP−PEA−P2VP), with a mole ratio of 0.1/0.8/0.1 as a telechelic polymer, and a poly(4-hydroxystyrene) (PHS) homopolymer, with Mn = 6600 as a connector, form a physical gel via hydrogen bonding between P2VP and PHS. The thermally stable, hydrophobic ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMITFSI) provided a good solvent medium for PEA from room temperature up to at least 160 °C. A solution containing 10 wt % P2VP−PEA−P2VP and 4% PHS was a liquid at elevated temperatures but on cooling formed a network at 141.5 °C. Dynamic shear moduli obtained as a function of frequency at various temperatures from 30 to 160 °C could be superposed to form excellent master curves, with a distinct plateau modulus extending over more tha...