Molecular-Weight Dependence of Center-of-Mass Chain Diffusion in Polymerized Ionic Liquid Melts
Molecular-Weight Dependence of Center-of-Mass Chain Diffusion in Polymerized Ionic Liquid Melts
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聚合离子液体熔体中质心链扩散的分子量依赖性
DOI:
10.1021/acs.macromol.2c02388
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发表时间:
2023
期刊:
影响因子:
5.5
通讯作者:
Evans, Christopher M.
中科院分区:
文献类型:
--
作者:
Lan, Peng;Zhao, Qiujie;Lv, Guangxin;Sheridan, Grant S.;Cahill, David G.;Evans, Christopher M.
Polymerized ionic liquids (PILs) with flexible polymer chains and weakly interacting ionic liquid (IL) groups have received great attention for their desirable properties in electrochemical applications such as ionic conductivity. Less is known about their dynamic properties such as center-of-mass chain diffusion and how it depends on molecular weight in the presence of IL groups. In this work, a series of acrylic PILs with imidazolium cations and bis(trifluoromethanesulfonyl)imide (TFSI) anions (TFSI-f-PILN) were synthesized via reversible addition–fragmentation chain-transfer polymerization with degrees of polymerizationNranging from 40 to 236. A fluorescent acrylic monomer with the 7-nitrobenzofurazan group was copolymerized at trace levels as a probe of chain motion, and the diffusion coefficient (D) of TFSI-f-PILNwas determined by fluorescence recovery after photo bleaching atTg+ 45 K. Within the uncertainty of 3–20%, a scaling relationship ofD∼N–2was observed which is the same as the scaling of linear neutral polymers. Wide-angle X-ray scattering exhibited no peak at ∼5 nm–1, indicating no long-range imidazolium-TFSI ionic correlations. Our results indicate that the molecular weight dependence of center-of-mass diffusion is not affected by electrostatic interactions of IL groups. No transition from a Rouse regime (D∼N–1) to reptation regime (D∼N–2) was observed within the studiedNrange.
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