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. 2018 Oct 23;8(63):36025–36033. doi: 10.1039/c8ra07733a

Viscosities and densities (measured at 30 °C) and scanning thermogravimetry-determined short-term thermal stabilities of ILsa.

IL Dynamic viscositya (mPa s) Kinematic viscositya (mm2 s−1) Densitya (g cm−3) T der b (°C) T dcp c (°C) Transition shape d Residual char e
1 [MeOCH2CH2-PEt3][Tf2N] 36.0 26.3 1.368 468 362 M 2.6%
2 [MeOCH2CH2-PBu3][Tf2N] 122.5 99.0 1.237 449 354 M 1.0%
3 [MeOCH2CH2-PBu3][beti] 163.4 127.1 1.286 425 318 M 0.9%
4 [Me(OCH2CH2)2-PBu3][Tf2N] 95.5 78.6 1.215 445 319 M 1.4%
5 [Me(OCH2CH2)3-PBu3][Tf2N] 79.8 66.8 1.195 448 318 M 1.7%
6 [Me(OCH2CH2)4-PBu3][Tf2N] 90.2 75.0 1.203 450 335 M 2.2%
7 [MeOCH2CH2-Et-Im][Tf2N] 33.1 22.7 1.458 468 401 S 3.4%
8 [MeOCH2CH2-Py][Tf2N] 44.5 29.5 1.508 456 403 M 2.8%
9 [MeOCH2CH2-Et3N][Tf2N] 61.4 44.4 1.383 427 380 S 0.0%
10 [MeOCH2CH2-Me-Pip][Tf2N] 84.2 59.0 1.426 453 399 S 0.3%
11 [BMIM][Tf2N] 41.4 28.9 1.430 464 406 S 1.5%
12 [BMIM][PF6] 205.8 151.1 1.362 472 424 S 0.5%
a

The viscosity and density data were acquired using an Anton Paar SVM 3000 viscometer; measurements were made at 30 °C. Thermogravimetric analysis (TGA) scans were measured on a TA Instruments TGA Q50 under a nitrogen atmosphere (60 mL min−1) using Pt pans with a heating rate of 10 °C min−1.

b

T der is determined from the maximum in the first-derivative profile of the TGA scan.

c

T dcp is the decomposition temperature measured as the onset of decomposition, using the common criterion of 10% total mass loss. Uncertainties in the temperatures are estimated to be on the order of ±2–3 °C.

d

The TGA mass loss behavior is qualitatively characterized on the basis of whether it occurs essentially in a single, discrete step (S) or exhibits multiple step (M) thermal decomposition. The latter is generally associated with an early mass loss step which occurs at a temperature 50–100 °C below the primary event within the vicinity of Tder. It should be noted that, for this reason, profiles that display some multi-step thermal decomposition character generally have lower effective Tdcp values.

e

The amount of carbon char residue is determined from the relative mass remaining at 600 °C; a residue amount on the order of ±1–2% should be considered within the error of the measurement baseline.