摘要:

AbstractSynthesis and properties of a resacetophenone‐formaldehyde resin are described. The number average molecular weight of the resin determined by vapour pressure osmometry and nonaqueous conductometric titration is 2500 and 2200 g/mol, respectively.Cu(II), Ni(II) and Co(II) chelates of the resin were prepared. The elemental analysis of chelates indicated a metal to ligand ratio 1:2. From the diffuse reflectance spectra of the chelates it could be concluded that Ni(II) and Co(II) chelates have a tetrahedral structure while Cu(II) chelate has a square planar structure. Infrared spectral studies showed that the metals are co‐ordinated through the oxygen of the carbonyl and phenolic groups. The presence of methylene bridges was also indicated from IR spectral studies. The thermal properties of the resin and its metal chelates are discus

ISSN:0003-3146    

DOI:10.1002/apmc.1981.050930101

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe resacetophenone‐formaldehyde (RAP‐F) resin showed to be a selective chelating ion‐exchange resin for certain metal ions. A batch equilibration method was used in the study of the selectivity of metal ion uptake. The method involved the measurement of distribution of a given metal ion between an aqueous solution and the resin. The study was carried out over a wide pH range and in media of various ionic stre

ISSN:0003-3146    

DOI:10.1002/apmc.1981.050930102

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe object of this paper is to present the features of a simulation model for the evaluation of the branching coefficient of complex polymer networks. A generalized computer program, developed for this purpose, has yielded values which are in good agreement with those obtained from the well‐known theoretical equations for the simpler 3,2,1/2,1 syste

ISSN:0003-3146    

DOI:10.1002/apmc.1981.050930103

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe formation of diurea compounds containing methylene and dimethylene ether bridges, respectively, as well as the formation of more highly condensed compounds during the preparation of urea‐formaldehyde resins under different conditions have been investigated. The quantitative determination of each individual diurea compound was carried out by means of liquid chromatography. Identification of diurea compounds with a dimethylene ether bridge was made by1H‐NMR spectrosc

ISSN:0003-3146    

DOI:10.1002/apmc.1981.050930104

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe condensation of resin compounds during drying of wet mixtures consisting of resin and filler was examined by gel permeation chromatography of resins extracted from various intermediates being dried. The influence of pH (wet mixture), temperature, and drying time upon the molecular growth was studied.

ISSN:0003-3146    

DOI:10.1002/apmc.1981.050930105

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThermal behaviour of m‐methoxyanisole‐1,2‐dichloroethane resins was studied at different heating rates. Kinetic parameters for the decomposition of the resins have been determined from TG and DTA studies using various methods of thermal analysis. The first stage of degradation had E1∼ 3, the second stage had E2∼ 28 and the overall degradation had E12∼ 36 kcal·mol−1

ISSN:0003-3146    

DOI:10.1002/apmc.1981.050930106

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractUnder different conditions of reaction the conversion of 5‐isocyanato‐1‐(isocyanatomethyl)‐1,3,3‐trimethylcyclohexane into urea and biuret derivatives was carried out applying water as the converting agent. It has been proved that reaction products are heterogeneous, since four oligomers are contained in the mixtures. The influence of the reaction conditions on the concentration of the components was investigated. The results of physico‐chemical measurements of the obtained products in dependence on the temperature of synthesis and applied molar ratio of the reagents have been

ISSN:0003-3146    

DOI:10.1002/apmc.1981.050930107

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractCharacteristic fading curves of some monoazo dyes on polyester films were examined. The slopes of these curves were dependent upon both the physical as well as the chemical properties of the dyes. Only for those dyes, which were capable of forming intramolecular hydrogen bonds negative slopes were shown, whereas for the other dyes the slopes were positive.

ISSN:0003-3146    

DOI:10.1002/apmc.1981.050930108

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractAmmoniumsalze von α‐Ketocarbonsäuren, z.B. Phenylglyoxylsäure oder Benzylidenbrenztraubensäure, spalten bei Belichtung in organischen Lösungsmitteln unter Decarboxylierung in Aldehyde, z. B. Benzaldehyd oder Zimtaldehyd, und in das entsprechende ”freie“ Amin. Polyurethanlacke, die z.B. Ammoniumsalze der Phenylglyoxylsäure enthalten, härten nach Belichtung wesentlich schneller aus als unbeli

ISSN:0003-3146    

DOI:10.1002/apmc.1981.050930109

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractPeriodate oxidized cellulose was grafted with methyl methacrylate using hydrazine hydrate in presence and absence of Cu++. The grafting reaction was favoured in presence of Cu++and it was advantageous to treat first the cellulose material with copper sulphate solution rather than to incorporate it in the polymerization system. The graft yields depended upon the concentrations of copper sulphate and hydrazine hydrate, pH, temperature, and time of polymerization as well as degree of oxidation of cellulose. There were optimal concentrations of copper sulphate (6–8 mmol/l) and hydrazine hydrate (2 mmol/l). A polymerization medium of pH 6 and a temperature of 60°C constituted to optimal pH and temperature for grafting. Oxidized cellulose proved to be more amenable to grafting as compared with unoxidized cellulose and the magnitude of grafting relied on the degree of oxidation. A tentative mechanism was also suggested for grafting of cellulose substrates with a vinyl monomer using a Cu++‐hydrazine hydrate redox sy

ISSN:0003-3146    

DOI:10.1002/apmc.1981.050930110

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY