摘要:

AbstractVapour pressures of cis‐ and trans‐1,2‐dichloroethene have been measured over a temperature range from zero‐point up to about 90°C, using glass spring tensimeters of the type, applied in this laboratory for all determinations of this kind. Special care was taken in purifying the samples of the two isomers. Dielectric constant measurements were carried out in order to control the degree of purity of the samples. The values of the vapour pressures obtained are compared with those, determined by some authors in the past. Heats of vaporization and Trouton constants are derived from the meas

ISSN:0165-0513    

DOI:10.1002/recl.19470661202

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

摘要:

AbstractUsing a modified form of the Ostwald viscosimeter, viscosity‐measurements have been carried out over a temperature‐range from the melting points up to about 20°C for the two isomers of 1,2‐dichloroethene. Densitymeasurements were made over the same range of temperature. Special care has been taken in purifying the samples used. From the data obtained, values of the free energy, the energy and the entropy of activation for viscous flow have been calculated, using the theory ofEyring.It appears that the experimental quantity Evis, defined by, has a temperature‐independent value of about the same magnitude for both isomers, whereasEyring's“energy of activation for viscous flow” is temperature‐dependent.It is concluded that both isomers behave as normal unassociated substances, which conclusion is reached as well from consideration of the values of the “rheochor” and from the relation between the surfac

ISSN:0165-0513    

DOI:10.1002/recl.19470661203

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

摘要:

AbstractA Weissenberg‐apparatus is described, giving accurate values of the integrated reflexion‐intensities without the use of an integrating photome

ISSN:0165-0513    

DOI:10.1002/recl.19470661204

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

摘要:

AbstractProceeding from the Keuffel&Esser Color Analyzer a photo‐electric apparatus was designed, which can render good service for the colour measurement of dyed textiles.The reflection at one or more wave lengths is determined and taken as a colour coordinate when studying the relation between the quantity of dyestuff on the fibre and the resulting colou

ISSN:0165-0513    

DOI:10.1002/recl.19470661205

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

摘要:

AbstractThis short communication contains an accurate statement on the melting point of the above‐mentioned compoun

ISSN:0165-0513    

DOI:10.1002/recl.19470661206

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

摘要:

AbstractA by‐product of the Reformatzky‐reaction of β‐ionone and ethyl γ‐bromocrotonate is acis‐β‐ionylidene‐crotonic acid I. This acid can easily be converted into thecis‐C18‐ketone by me

ISSN:0165-0513    

DOI:10.1002/recl.19470661207

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19470661208

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19470661201

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY