Designing melt flow of poly(isobutylene)-based ionic liquids
Designing melt flow of poly(isobutylene)-based ionic liquids
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DOI：
10.1039/c3ta12646c
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发表时间：
2013-09
影响因子：
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通讯作者：
A. Stojanovic;Clement Appiah;D. Döhler;Johanna Akbarzadeh;P. Zare;H. Peterlik;W. Binder
中科院分区：
文献类型：
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作者：
A. Stojanovic;Clement Appiah;D. Döhler;Johanna Akbarzadeh;P. Zare;H. Peterlik;W. Binder
报道了一系列新型聚异丁烯稳定离子液体(PIB-ILS)，它们具有强烈的温度依赖性纳米和介观结构。分子设计依赖于使用具有离子液体头基的液体聚合物，通过聚合链和离子液体(IL)头基引入液体性质，从而能够在传统ILS设计潜在的自愈合材料方面无法解决的末端流动。通过改变锚定的阳离子和阴离子以及连接的聚合物链的相对分子质量，可以设计出PIB-ILS的纳米结构和粘弹性行为。详细的小角X射线散射(SAXS)研究和流变学研究揭示了所制备的PIB-ILS的结构、粘弹性和松弛行为。所有研究的PIB-ILS在室温下都表现出一定的纳米和介观有序性，而锚定阳离子的性质对介观结构的温度依赖性以及PIB-ILS的流动行为都有很大的影响。溴离子与双(三氟甲基磺酰亚胺)的交换导致观察到的团簇在较低温度下松弛，并导致晶格无序-有序转变(LDOT)，也导致在较低温度下的末端流动。所研究的PIB-ILS具有较短的弛豫时间和在室温下冷却后立即恢复的纳米/介观形态，这使得它们适合于新型自修复材料的工程应用。
A series of novel poly(isobutylene)-based stable ionic liquids (PIB-ILs) with strongly temperature dependent nano- and mesostructures is reported. The molecular design relies on the use of a liquid polymer with an ionic liquid-head-group, introducing liquid properties by both the polymeric chain as well as the ionic liquid (IL) head-group thus enabling terminal flow in a range which cannot be addressed with classical ILs with respect to the design of potential self-healing materials. Modifying both the anchored cation and anion as well as the molecular weight of the attached polymer chain, the nanostructure and the viscoelastic behavior of PIB-ILs can be engineered. Detailed small-angle X-ray scattering (SAXS) investigations as well as rheology studies have been conducted to reveal structure, viscoelastic properties and relaxation behavior of the prepared PIB-ILs. All investigated PIB-ILs exhibited a defined nano- and mesoscale ordering at room temperature, whereas the nature of the anchored cation showed a strong impact on the temperature-dependence of the mesoscale-structure as well as on the flow behavior of PIB-ILs. Exchange of the bromide anion to bis(trifluoromethylsulfonyl)imide led to the loosening of the observed clusters and to lattice disorder–order transitions (LDOT) at lower temperatures, leading also to terminal flow at lower temperatures. Investigated PIB-ILs exhibited short relaxation times and the reestablishment of the nano/mesoscale morphology immediately after cooling at room temperature, which makes them suitable for the engineering of novel self-healing materials.