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arXiv 2202.09887cond-mat.softphysics.chem-ph
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小角中子散射研究聚离子液体的多尺度结构

Multiscale structure of poly(ionic liquid)s in bulk and solutions by small angle neutron scattering

Tiago Outerelo-Corvo, Antoine Jourdain, Shona O'Brien, Frédéric Restagno, Éric Drockenmuller, Alexis Chenneviere

摘要:

聚离子液体(PIL),类似于它们的离子液体(IL)类似物,呈现出由局部相互作用产生的纳米结构。这种纳米结构对聚合物链的大分子构象的影响是第一次通过广泛使用的小角中子散射上的一系列的聚(1-乙烯基-3-烷基咪唑)s与不同的烷基侧链长度和抗衡阴离子在散装和稀溶液中。回转半径被发现增加的侧链长度在溶液中作为相邻单体之间的拥挤相互作用的结果。然而,在散装,一个非单调的回转半径的演变反映了链的灵活性和静电相互作用的潜在屏蔽的变化。此外,在较小的规模,SANS提供了一个实验估计的链直径和相邻链之间的相关长度,比较揭示了明确的证据的烷基侧链的叉指。这些结构特征为理解PIL的动力学性质带来了宝贵的见解。

英文摘要:

Poly(ionic liquid)s (PILs), similar to their ionic liquid (IL) analogues, present a nanostructure arising from local interactions. The influence of this nanostructure on the macromolecular conformation of polymer chains is investigated for the first time by means of an extensive use of small angle neutron scattering on a series of poly(1-vinyl-3-alkylimidazolium)s with varying alkyl side-chain length and counter-anion both in bulk and in dilute solutions. Radii of gyration are found to increase with the side-chain length in solution as a consequence of crowding interactions between neighboring monomers. In bulk, however, a non monotonic evolution of the radius of gyration reflects a change in chain flexibility and a potential screening of electrostatic interactions. Additionally at smaller scale, SANS provides an experimental estimation of both the chain diameter and the correlation length between neighboring chains, comparison of which unveils clear evidence of interdigitation of the alkyl side-chains. These structural features bring precious insights in the understanding of the dynamic properties of PILs.

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