摘要:

An analysis is presented of the experimental data on thermodynamic properties in the critical region of steam. The model used is that of revised and extended scaling, as given by the modern theory of critical phenomena. All thermodynamic properties are given in closed (parametric) form. The model has, in addition to three universal constants that are given by theory, sixteen adjustable parameters that were obtained by least‐squares fit toPVTand speed‐of‐sound data. It is valid in the range 200–420 kg/m3in density and 644–693 K in temperature. It accurately represents the experimental data for equation of state, vapor pressure, latent heat, specific heatsCpandCvand speed of sound. Our analysis permits new estimates of the critical parameters of steam, and has led to a number of conclusions regarding the mutual consistency of the experimental data. Tabulated values of the thermodynamic properties of steam are appended to the paper.

ISSN:0047-2689    

DOI:10.1063/1.555676

出版商:AIP    

年代:1983

数据来源: AIP

摘要:

The heat capacity of poly‐1‐butene, poly‐1‐pentene, poly‐1‐hexene, polyisobutylene, poly(4‐methyl‐1‐pentene), polybutadiene,cis‐1, 4‐poly(2‐methylbutadiene), polycyclopentene, poly(vinyl fluoride), poly(vinylidene fluoride), polytrifluoroethylene, polytetrafluoroethylene, poly(vinyl chloride), poly(vinylidene chloride), polychlorotrifluoroethylene, poly(vinyl alcohol), poly(vinyl acetate), poly(&agr;‐methylstyrene), poly(o‐methylstyrene), poly(o‐chlorostyrene) and a series of poly(vinyl benzoate)s is reviewed on the basis of 62 measurements reported in the literature. A set of recommended data has been derived for each polymer. Entropy and enthalpy functions have been calculated for poly‐1‐hexene, polyisobutylene,cis‐1, 4‐poly(2‐methylbutadiene), poly(vinyl chloride), and poly(&agr;‐methylstyrene). This paper is seventh in a series which will ultimately cover all heat capacity measurements on linear macromolecules.

ISSN:0047-2689    

DOI:10.1063/1.555677

出版商:AIP    

年代:1983

数据来源: AIP

摘要:

Heat capacity of polyglycolide, poly(&egr;‐caprolactone), poly(ethylene terephthalate), poly(ethylene sebacate), polyglycine, poly(L‐alanine), poly(L‐valine),nylon 6, nylon 6.6 and nylon 6.12 is reviewed on the basis of measurements on 35 samples reported in the literature. All heat capacity data are compiled and a set of recommended data have been derived for each polymer. Crystallinity dependence is critically evaluated for poly(ethylene terephthalate). Enthalpy and entropy functions are calculated for amorphous poly(ethylene terephthalate). This is the eighth paper in a series of publications which will ultimately cover all heat capacity measurements of linear macromolecules.

ISSN:0047-2689    

DOI:10.1063/1.555678

出版商:AIP    

年代:1983

数据来源: AIP

摘要:

In this final review, a series of polymers which include aromatic rings and/or inorganic chain atoms are treated. Heat capacities of poly(4,4′‐isopropylidenediphenylene carbonate), polyphenylenediamides, polyheteroarylenes, poly(dimethyl siloxane), poly(diethyl siloxane), poly(trimethylsilyl ethylene), poly(dimethylphenylsilyl ethylene), poly(dimethylbenzylsilyl ethylene), poly(vinylene diphenylsilylene), poly(vinylene diphenylgermylene), poly(diethnyl diphenysilylene), poly(diethnyl diphenylgermylene), poly(2,3,4,5‐tetraphenyl‐1, 1‐diethylgermocyclopentadiene), poly(phenylsilsesquioxane), poly[ethylene ‐N‐(&bgr;‐trimethylsilylethyl)imine] and polysulfones have been reviewed on the basis of measurements on 36 samples reported in the literature. All heat capacity data are compiled and a set of recommended data are derived. Enthalpy and entropy functions are calculated for poly(4,4′‐isopropylidenediphenylene carbonate) and poly(dimethyl siloxane).

ISSN:0047-2689    

DOI:10.1063/1.555679

出版商:AIP    

年代:1983

数据来源: AIP

摘要:

Available data on the electron transport properties and electron swarm coefficients are discussed for the following electronegative gases: SF6, CF4, C2F6, C3F8, C4F10, CCl2F2, O2, air, H2O, CO2, F2, NF3, Cl2, Br2, I2, N2O, NO, HCl, NH3. Graphical presentations comparing measured and calculated data are given for the electron drift velocity, the ratio of diffusion to mobility, the electron attachment and ionization coefficients, and the electron growth constant as functions ofE/N, the reduced field strength, for each gas. Graphs of the detachment and excitation coefficients are presented where these data are available. Data originally reported in terms of rate coefficients as functions of mean electron energy are graphically presented in that form. Recommendations concerning reliability are made.

ISSN:0047-2689    

DOI:10.1063/1.555675

出版商:AIP    

年代:1983

数据来源: AIP