摘要:

Abstract1‐Hexadecene ozonide was prepared in connection with the investigation of the effect of aminic antidegradants in rubbers, and its reactions with amines were studied. At room temperature, it is quickly degraded with triethyl amine into the corresponding carboxylic acids and carbonyl compounds. The arising acids gradually neutralize the base, but only a major excess of acids strongly slows down the reaction. The reaction of ozonide with N,N′‐diphenyl‐1,4‐phenylenediamine is a more complicated process. The main reaction consists however in the reduction of ozonide to pentadecanal and formaldehyde with the simultaneous oxidation of N,N′‐diphenyl‐1,4‐phenylenediamine to N,N′‐diphenyl‐1,4‐benzoquinonediimine. At room temperature the reaction is rather slow and requires the presence of a catalyst. A catalytic effect has been observed e.g. with acids, which on the other hand cause secondary changes in the arising diimine, in particular its hydrolysis. The probable reaction

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051020101

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe preparation of cellulose membranes from mixtures of cellulose, nonprotonic polar organic solvents, paraformaldehyde, and basic catalyst was studied. When dimethyl sulfoxide was used as casting solvent, the resulting membrane was the densest. An increase of an additional amount of triethyl amine used as basic catalyst gave denser membranes.

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051020102

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractIn this paper we report some of the physico‐chemical changes occurring in poly(phenylene sulphide) prepared by the homopolycondensation of thiophenol. The various electrical properties measured on these polymers were used to identify the temperatures at which these transitions occu

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051020103

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractMeasurements of the various electrical properties such as dielectric constant (ε′) and loss (tan δ), electrical conductivity and studies on thermal depolarization phenomena on thiophenol formaldehyde resins help to identify the various types of curing reactions occurring within the samp

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051020104

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractSamples of linear polycaprylolactam have been prepared and fractionated, and the [η]‐Mwrelationship has been established in m‐cresol. Statistically branched samples have been obtained by copolymerizing 8‐caprylolactam with bislactams. The degree of branching as well as the branching ability of different bislactams are discussed and compared with the corresponding data for branched polycaprol

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051020105

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractUntersucht wurden die katalytischen Eigenschaften von Metall‐Polyphthalocyaninen mit Fe(II), Co(II), Cu(II), Ni(II) und Mg(II) bei der Zersetzung von Wasserstoffperoxid und ihre elektrochmischen Eigenschaften bei der Reduktion von Sauerstoff. Es ergab sich, daß eine große übereinstimmung zwischen katalytischer und elektro‐chemischer Aktivität der untersuchten Metall‐Polyphthalocyanine besteht. Darüber hinaus wurde ein starker Einfluß des Reaktionsmittels sowohl auf die katalytische als auch auf die elektrochemische Aktivität festgestellt. Für Eisen‐Polyphthalocyanin, das in konzentrierter Schwefelsäure löslich ist, läßt sich eine lineare Abhängigkeit zwischen der Konstante für die Reaktionsgeschwindigkeit der Zersetzung von Wasserstoffperoxid und seiner elektrischen Lei

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051020106

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractGraft copolymerization of acceptor monomers methyl acrylate and ethyl acrylate onto Himachali wool fiber has been studied in aqueous medium by using vanadium oxyacetyl acetonate as initiator at 40, 50, 60, and 70°C. Graft copolymerization was carried out for various reaction periods and nitric acid was found to catalyse the reaction. Percentage of grafting and percent efficiency have been determined as functions of concentration of nitric acid, concentration of initiator, concentration of monomer, time, and temperature. Under optimum conditions, methyl acrylate and ethyl acrylate afforded maximum grafting to the extent of 28.4 and 18.5%, respectively. Relative reactivities of methyl acrylate and ethyl acrylate towards grafting have been compared with those of methyl methacrylate, acrylic acid and vinyl acetate reported earlier from this laboratory. Different vinyl monomers showed the following reactivity order: MMA>MA>EA>AAc>VAc. Several grafting experiments were carried out in the presence of various additives which included tert‐butylhydroperoxide (TBHP), dimethylsulfoxide, pyridine, and dimethylformamide. Only TBHP was found to enhance grafting to a considerable extent, other additives decrease percent grafting of both methyl acrylate and ethyl acryla

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051020107

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractTemperature dependent characteristics of blends of suspension poly(vinyl chloride) with low and high molecular weight plasticizers in the region of processing temperatures have been investigated. The interaction process has been studied under dynamic conditions using the differential thermal analysis (DTA) method under non‐iso‐thermal conditions. As a result of the DTA curves evaluation as well as of the discussion of results it has been shown that the energy transformation occurring during the PVC‐plasticizer system processing is manifested by changes of thermal behavior. The values of heat released, corresponding to the maximum heat transfer rate have been identified as primary data which can be used in correlations describing the quality of plasticizers present in the system. The correlational relations covering the region of processing temperatures provide a “homogeneity” criterion of the system, corresponding to the plasticizing capability of the plasticizer

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051020108

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe reactions of urea with formaldehyde were studied by means of13C NMR spectroscopy and differential scanning calorimetry (DSC) in acid and neutral medium, the temperature range being between 290 and 390 K. At higher pH the peak of the DSC curve splits into two peaks one of which belongs to the addition of formaldehyde to urea and the second to the subsequent condensation of the latter. For both reactions, the activation energy, heat of polymerization, reaction order and temperature maximum have been determined. The usefulness of DSC to study the kinetics of more complex polycondensation reactions was established.

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051020109

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractUntersucht wurde die Kinetik der Copolykondensation des Dreikomponentensystems Dimethylterephthalat, Ethylenglykol und 1,4‐Bis‐β‐hydroxyethoxy‐2,3,5,6‐tetrabrombenzol. In der überwiegenden Zahl der Fälle wurde eine Reaktion zweiter Ordnung nachgewiesen. Der Einfluß des Modifikators und der Temperatur auf die Kinetik des Prozesses wurde untersucht und ein mathematisches Modell, das die Reaktion mit genügender Genauigkeit beschreibt, entwickelt. Nachgewiesen wurde die ungewöhnlich große Aktivität der Katalysatormischung Zn(OAc)2, Ti(OC4H9)4, Sb(OAc)3bei der untersuchten C

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051020110

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY