The Heat Capacity and Entropy, Heats of Transition, Fusion and Vaporization and the Vapor Pressures of Cyclopentane. Evidence for a Non-planar Structure

Abstract

Entropy of Cyclopentane 341 sum £(333/ ) + 2£(494/ ) + 2£(1058/ ), which fits the data over the entire experimental range of temperature. In both instances only the Debye function is of importance in the extrapolation of entropy. Table II Entropies at 298.16°K. (cal./dbg. mol.) MgaSiO* MgSiOs 0-50.12°K. (extrap.) 0.60 0.49

Enthalpies and entropies of fusion of ten alkane-α, ω-diamines H2 N– (CH 2)n– NH2 where 3⩽n⩽12

“…The sensitivity s of the heat-flux detector as a function of temperature was determined by the manufacturer through a series of calibration runs using the Joule effect in the working temperature interval of the calorimeter T = (180 to 1100) K. The results of several melting runs performed under the same conditions as our d.s.c. measurements with various recommended reference materials are reported in table 2 (columns 5 and 7), and the agreement with the selected literature data (34)(35)(36)(37)(38) was about 0.06 per cent for temperature and about 0.3 per cent for enthalpy.…”

“…peak measured by the thermal (34) 2.295 ± 0.005 2.2953 ± 0.0004 (34) Water Aldrich 6 273.12 ± 0.18 273.15 (35) 6.057 ± 0.018 6.0017 (35) Cyclohexane Aldrich 5 279.43 ± 0.24 279.84 ± 0.05 (36) 2.643 ± 0.083 2.627 ± 0.007 (36) Naphthalene LGC 4 353.05 ± 0.14 353.39 ± 0.03 (37) 19.072 ± 0.045 19.05 ± 0.04 (37) Benzoic acid Fluka 4 395.03 ± 0.14 395.52 (38) 17.787 ± 0.075 18.00 ± 0.10 (38) a Uncertainties are expressed as twice the standard deviation of the mean. b Number of calorimetric runs.…”

Low temperature micro-calorimetry by differential scanning

“…In the insert of J/tool and 615 (24) J/tool. Our data for T, and AH are, within the given errors, in agreement with the values obtained by adiabatic precision calorimetry [25].…”

Novel synthesis of triblock PDMS-PS-PDMS copolymers

“…The DSC was calibrated from the heat of transition (Ϫ87.06°C) 16 and melting point (6.54°C) 11 of cyclohexane as well as from the glass-transition temperature (T g ; Ϫ125°C) 17 of PDMS. The analysis was begun by equilibration at Ϫ150°C for 30 min.…”

“…, and the equilibrium expansion factor ␣ (0.017) is based on the extrapolation of literature data 16 based on an interfacial tension value of 5 dyne/cm 1 . This result is in agreement with other TEM studies reported for PDMS-PS-PDMS triblock copolymers.…”