摘要:

AbstractThe flow micro‐calorimeter has been used for the determination of energies of adsorption at monolayer coverage (mcal/g of powder) from solution for a homologous series of long‐chain alcohols, the solvent in each case being n‐heptane. The results show that the energies increase with increase in length of the carbon chain until the chain has six carbon atoms; the energies then fall to a constant value.The area occupied by one adsorbed molecule increases slowly at first, more rapidly for a chain length of four to eight carbon atoms and then approaches a constant value. The heat of adsorption (kcal/mole of solute adsorbed) rises rapidly at first and smoothes off to a constant value as the length of the carbon chain increases above ten.It is suggested that this indicates that the molecules orientate themselves in the form of a spiral with six carbon atoms on the surface of the solid; this requires a bond angle of 120° which is in agreement with the findings of Calvet&

ISSN:0021-8871    

DOI:10.1002/jctb.5010200601

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractThe vapour‐liquid equilibria of the system: carbon tetrachloride‐toluene were studied at five isothermal conditions by use of a modified Dvorak&Boublik circulation still. Liquid activity coefficients, γ, were evaluated. The values of γ were close to unity. The In γ values were correlated by a three‐constant Redlich‐Kiste

ISSN:0021-8871    

DOI:10.1002/jctb.5010200602

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractThe reaction of isoprene with phenol, catalysed by nickelocene and phenylmagnesium bromide, yields 2,2‐dimethylchroman, 2‐(3′‐methyl‐2′‐buten‐1′‐yl)phenol, 4‐(3′‐methyl‐2′‐buten‐1′‐yl)phenol, 2,2‐dimethyl‐8‐(3′‐methyl‐2′‐buten‐1′‐yl)chroman and 2,2‐dimethyl‐6‐(3′‐meth

ISSN:0021-8871    

DOI:10.1002/jctb.5010200603

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractThe reduction of aromatic carbonyl compounds by means of nickel/aluminium alloy in alkaline solutions and suspensions has been examined and results were obtained that were different from certain of those reported earlier. Improvements in the technique are described.

ISSN:0021-8871    

DOI:10.1002/jctb.5010200604

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractThe preparation of titanium and zirconium chloroalkoxides by the treatment of titanium tetrachloride with ethylene oxide vapour and zirconium tetrachloride with either ethylene oxide vapour or 1,2‐propylene oxide is described. Under the reaction conditions used, ethylene oxide gives mainly the tetra‐(2‐chloroethoxide). Zirconium tetrachloride and 1,2‐propylene oxide give the tetra‐(chloropropoxide). Titanium and zirconium chloroalkoxides, particularly the tetra‐(2‐chloroethoxides), can be used to bind suitably graded refractory powders. In admixture with diethanolamine, both titanium and zirconium tetra‐(chloroethoxide) are good thixotropy developers for aqueous

ISSN:0021-8871    

DOI:10.1002/jctb.5010200605

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractThe preparation of ethyltri‐(2‐aminoethoxy)silane and diphenyldi‐(2‐aminoethoxy)silane, together with their treatment with 1,2‐epoxypropane and 1,2‐epoxybutane, is described. The products are typical of the reaction products of mono‐oxiranes and alkyl or aryl (aminoalkoxy)silanes. Such products have widely varying properties and industrial uses. Some are water‐soluble and can be used in water‐based stoving finishes. Others can be used in conjunction with epoxy resins or diisocyanates to prepare surface‐coating compositions which on stoving produce tough films h

ISSN:0021-8871    

DOI:10.1002/jctb.5010200606

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractIn the preparation of magnesium oxychloride cement from MgO and MgCl2.6H2O solution, MgO is sometimes replaced by partially calcined dolomite, MgO.CaCO3. In this paper, the suitability of dolomites for this purpose was studied by use of petrographic, d.t.a. andX‐ray diffraction techniques. It is shown that for making good oxychloride cement, the dolomite should be compact and microcrystalline. Impurities such as siderite, haematite, magnetite and clayey matter which are generally present in dolomites, form a coating over the MgO particles during partial calcination at 750° and make the fired material less reactive and generally unsuitable for making oxychloride ceme

ISSN:0021-8871    

DOI:10.1002/jctb.5010200607

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractSimplifying postulates facilitate the derivation of a two‐parameter equation which relates the deterioration in impact insensitivity to the magnitude of grit additions. The impact insensitivity (ϕmax) of an adulterated explosive is related to the insensitivity (ϕmax) of the uncontaminated explosive by the equation: θ wheregis the weight fraction of added particulate grit (mixtures contained 0‐0.1% grit) andRandkare constants which depend on the explosive‐grit system and the method of testing. The equation was found to be in reasonable accord with the results of a series of tests using TNT, RDX and HMX in various admixtures with fine, gritty p

ISSN:0021-8871    

DOI:10.1002/jctb.5010200608

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

ISSN:0021-8871    

DOI:10.1002/jctb.5010200609

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractTar resulting from fluidised‐bed, low‐temperature carbonisation of coal was treated to yield a neutral oil from which a series of six other samples was extracted. These were examined by proton magnetic resonance (p.m.r.) spectroscopy, low‐ionising‐voltage (11 eV) mass spectroscopy (m.s.), gel chromatography followed by fluorescent indicator analysis, and cryoscopy. Aliphatic fractions separated chromatographically were also examined by infra‐red spectroscopy.Distributions of hydrogen between chemical types were found for the several fractions from 60 MHz p.m.r. spectra and presented in terms of average structural parameters. M.s. analysis indicated negligible cracking of paraffin components, and the average molecular weight of 197 agreed well with cryoscopic determinations. For the carbon ratio,fa, between aromatic and total, agreement between m.s. and p.m.r. depends on the p.m.r. structural analysis scheme adopted. P.m.r. and m.s. structural analyses of the aromatics emphasise the predominance of di‐ and tri‐nuclears, with about 40% of available sites substituted, and the importance of acenes in lowtemperature carbonisation material. Gas and gel chromatography showed urea‐adductable paraffins to be largely straight‐chain C10‐C26, much as for tars from carbonisation at

ISSN:0021-8871    

DOI:10.1002/jctb.5010200610

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY