

FOLLOWUS
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering of China, Sichuan University, Chengdu 610065, China
yhniu@scu.edu.cn (Y.H.N.)
guangxianli@scu.edu.cn (G.X.L.)
Received:30 April 2022,
Revised:2022-6-30,
Accepted:14 July 2022,
Online First:09 October 2022,
Published:01 February 2023
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Luo, H.; He, X.; Liu, G.; Niu, Y. H.; Li, G. X. Dynamics of poly(methyl methacrylate) in ionic liquids with different concentration and cationic structures. Chinese J. Polym. Sci. 2023, 41, 315–324
Huan Luo, Xi He, Gang Liu, et al. Dynamics of Poly(methyl methacrylate) in Ionic Liquids with Different Concentration and Cationic Structures[J]. Chinese Journal of Polymer Science, 2023, 41(2): 315-324.
Luo, H.; He, X.; Liu, G.; Niu, Y. H.; Li, G. X. Dynamics of poly(methyl methacrylate) in ionic liquids with different concentration and cationic structures. Chinese J. Polym. Sci. 2023, 41, 315–324 DOI: 10.1007/s10118-022-2840-z.
Huan Luo, Xi He, Gang Liu, et al. Dynamics of Poly(methyl methacrylate) in Ionic Liquids with Different Concentration and Cationic Structures[J]. Chinese Journal of Polymer Science, 2023, 41(2): 315-324. DOI: 10.1007/s10118-022-2840-z.
Compared with the traditional MIL
DIL could play a role as physical cross-links among PMMA chains by hydrogen bonding between PMMA and imidazolium rings. The additional physical network tends to form at high DIL content
due to the probability of physical cross-links formation increases with increasing DIL concentration.
The dynamic behavior of entangled poly(methyl methacrylate) (PMMA) chains in both the traditional monocationic ionic liquid (MIL) and synthetic dicationic ionic liquid (DIL) with the same anion bis[(trifluoromethyl)sulfonyl]imide ([TFSI]
−
) has been examined over the wide composition range using differential scanning calorimetry and rheological measurements. PMMA/DIL and PMMA/MIL systems exhibit two glass transitions in the midrange of composition due to self-concentration effects. PMMA in DIL shows slower relaxation behavior
however
after the iso-free-volume correction
the terminal relaxation time
τ
0
of PMMA in both the DIL and MIL presents the power law behavior
τ
0
~
ϕ
v
with exponent
v
conforming to experimental results for conventional polymer solutions (
v
=2.0±0.2). At high ILs concentration (70%)
the entanglement molecular weight
M
e
of PMMA/DIL system is lower than that of PMMA/MIL system owing to the formation of additional physical network in DIL
while the difference of
M
e
is reversed at low ILs content. The composition dependence might be related to the fact that the probability of formation of physical cross-linking points in linked double imidazolium ring increases with the increase of DIL content. The recovered creep strain of PMMA/DIL is almost 18 times of PMMA/MIL
exhibiting significantly better viscoelastic behavior.
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