The vapor–liquid equilibrium for the binary system (HFO-1234yf + HFO-1234ze­(E)) has been investigated using a liquid-recirculation apparatus from 284 to 334 K. The Peng–Robinson equation of state with the Mathias–Copeman alpha function (PR-MC), combined with Wong–Sandler (WS) mixing rule and simplified Wong–Sandler (WS_S) mixing rule, respectively, was chosen to correlate all of the experimental data. The results correlated by PR-MC + WS + NRTL and PR-MC + WS_S + NRTL models showed a good agreement with the experimental data; the average absolute relative deviation of pressure (AARDp) was within 0.5%, and the average absolute deviation of the mole fraction of HFO-1234yf in the vapor phase (AADy 1) was less than 0.002. This system exhibited no azeotropic behavior within the investigated temperature range. In addition, the relative volatilities of the system at each temperature were obtained.

A new fluorine-containing monomer 3-(Ntrifluoroacetamido)thiophene (F-TH) was synthesized and characterized for the first time. Its molecular structure was determined by a single-crystal X-ray study. F-TH functions as a building block in electropolymerization with 3,4-ethylenedioxythiophene (EDOT) gives a novel conjugated copolymer P(F-TH:EDOT) subsequently. Compared with the parent homopolymer poly(3,4ethylenedioxythiophene) (PEDOT) film, sponge-like nanoporous P(F-TH:EDOT) film has a slightly larger band gap with a reduced hydrophilic and increased oleophilic surface. Spectroelectrochemical analysis results reveal that P(F-TH:EDOT) exhibits excellent electrochromic performances with higher optical contrast (55%) and much shorter coloring time (0.70 s) than that of PEDOT (43%, 1.54 s). The coloration efficiency value of P(F-TH:EDOT) achieves up to 167.9 cm 2 /C, 55% higher than that of PEDOT (108.1 cm 2 /C). These improved electrochromic properties of P(F-TH:EDOT) are probably related with the enhanced wettability to electrolyte solution.Electrochromic conjugated polymers (ECPs), which can effectively adjust the transmitted and reflected light based on their reversible redox states under small external voltages, have been extensively investigated owing to their potential applications on smart windows and mirrors, displays, thermal control, camouflage and sensors. [1][2][3][4][5][6][7][8] As the most established ECPs, thiophene-based polymers have been extensively investigated due to their significant optical changes between redox states, outstanding coloration efficiency and facile switching performances. 9-12 To date, a lot of monomers from the family of thiophenes have been developed as building blocks, and based on them, various ECPs with different properties have been synthesized, [13][14][15][16][17][18] but the

The vapor−liquid equilibrium (VLE) for the binary systems 1,1,2,3,3,3-hexafluoro-1-propene (R1216) + 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) and 1,1,2,3,3,3-hexafluoro-1-propene (R1216) + trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) have been investigated from 283.43 to 323.32 K and 283.28 to 323.16 K, respectively. The experimental apparatus was a recirculation system with a liquid phase pump to accelerate the VLE process. The Peng−Robinson equation of state combined with Mathias−Copeman alpha function, modified Huron−Vidal mixing rule, and nonrandom two-liquid activity coefficient model was employed to correlate the VLE data. The correlated results showed good agreement with the experimental results for the two mixtures. The average absolute relative deviation of pressure (AARDp) and average absolute deviation of vapor composition (AADy) were 0.32% and 0.003 for R1216 + R1234yf, and 0.21% and 0.004 for R1216 + R1234ze(E), respectively. The experimental and correlated results showed that there was a positive azeotrope for the system R1216 + R1234yf over all tested temperatures.

No abstract