ISSN:0021-8871    

DOI:10.1002/jctb.5010091210

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe spontaneous formation of monolayers from single hexadecanol crystals has been examined. It is confirmed that the rate of generation of a monolayer is, at constant temperature, proportional to the extent of the air/water/crystal triple interface. Surface solution occurs directly from the properly formed crystal lattice and not necessarily from active centres only. The effect of film dissolution into the substrate on the spreading process is examined.

ISSN:0021-8871    

DOI:10.1002/jctb.5010091201

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractForty‐five phenols have been identified in a sample of coal tar acids of vertical‐retort origin. The method of separation was based on the butylation of close‐boiling cuts. Twenty‐two of the phenols had not previously been found in high‐temperature tars and nine are new compounds. Derivatives have been prepared and their melting points are listed.5‐Ethyl‐3‐methylphenol, 4‐ and 5‐hydroxy‐hydrindenes are the most abundant individual phenols boiling between the xylenols and the naphthols. The methyl‐hydroxyhydrindenes are the main constituents of the 255–285° range. Three butylphenols were isolated, the 3‐ and 4‐n‐ and the 4‐sec.‐isomers, these being the first examples of such large alkyl

ISSN:0021-8871    

DOI:10.1002/jctb.5010091202

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe development is described of 12 1/2 ml. water‐sampling vessels and amperometric titrations of iodine in 15 ml. total volume. Application of these techniques to dissolved oxygen analysis enables a precision of ± 0.002 p.p.m. to be achieved with a total water sample of 25

ISSN:0021-8871    

DOI:10.1002/jctb.5010091203

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe interfering effects of various substances on the Winkler reaction as applied to dissolved oxygen microanalysis have been elucidated. Ammonia,cyclohexylamine and morpholine do not interfere at concentrations encountered in power‐station practice. Interference from sulphite ion is overcome by the reversed‐reagents procedure introduced by Schwartz&Gurney, but this is invalidated in the presence of ferrous ion or hydrazine. Interference from this source is fully overcome by pre‐treatment of the water sample with an equilibrated strongly acidic cation‐exchang

ISSN:0021-8871    

DOI:10.1002/jctb.5010091204

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe corrosion characteristics of commercially pure aluminium in synthetic ‘tap’ waters, containing sodium chloride, calcium carbonate and dissolved copper, have been studied. In the presence of any two of the constituents, the loss in weight is very small, but nodular pitting is observed when the three are present. The maximum weight loss occurs when the Ca2+content is 50 p.p.m., irrespective of the chloride ion concentration, the copper content being constant.Specimens which have been anodised and subsequently sealed, show no pitting in two weeks; unsealed specimens are less effective in this respect. Localised corrosion is most severe after the oxide film has been removed in a phosphoric/chromic mixture.A theory is put forward to explain the initiation of pits and their subsequent development with t

ISSN:0021-8871    

DOI:10.1002/jctb.5010091205

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractIn contrast to 3‐buten‐1‐ynyldimethyl‐carbinol, 4‐penten‐2‐yn‐1‐ol gives on treatment with anhydrous ferric chloride an open‐chain dimer which readily polymerises on heating with benzoyl peroxide and 1: 1‐azobisisobutyronitrile as initiators to give resins which are insoluble in hot dioxan and coldcyclohexanone.Attempts to polymerise 1:1:3:3:6‐pentamethyl‐4‐isopropenyltsocoumaran and to copolymerise both this monomer and 1: 4‐di‐p‐chlorophenoxy‐2‐butyne with styrene by heating with benzoyl peroxide as initiator were unsuccessful. Similar attempts to polymerise and copolymerise 2‐methyl‐isopropenyl‐4‐methylo

ISSN:0021-8871    

DOI:10.1002/jctb.5010091206

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe reaction of wattle and mangrove polyphenols with formaldehyde was studied at various pH and under different conditions of temperature and time. The reactivity was greater at pH 8 than at pH 1 and least at pH 4–5. The initial fast stage in the reaction was followed by a slow stage. The formaldehyde uptake at pH 8 and 100° in 3 h. was determined for several polyphenols; it gave a better indication of the efficiency of a polyphenol as an adhesive than did the determination of Stiasny polyphenols. The reasons for the different behaviour of polyphenols as adhesives are discuss

ISSN:0021-8871    

DOI:10.1002/jctb.5010091207

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractRust on steel specimens exposed in Cambridge always contains ferrous sulphate, the amount of which is lowest in July and highest in January‐February. It is shown that rust catalyses the oxidation of SO2in the air to SO2.Paint applied to rusty steel when the ferrous sulphate content is lowest has the best durability. A “limpet cell” is described for the determination of ferrous sulphate on structuresin situ.The implications to the practical painting of rusty structures are disc

ISSN:0021-8871    

DOI:10.1002/jctb.5010091208

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractSea water spray tests on lap joints of aluminium alloy coupled with brass, steel and magnesium alloy assembled with a variety of experimental jointing compounds, have shown that a jointing compound giving protection appreciably greater than that of the standard D.T.D.369A can be formulated from a slightly soluble chromate and a medium which remains soft in a joint over a prolonged period. A very high degree of protection was obtained with water‐resistant self‐adhesive barrier tapes used in conjunction with jointing compo

ISSN:0021-8871    

DOI:10.1002/jctb.5010091209

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY