摘要:

AbstractThis paper deals with silylated and maleated polybutadiene oils and their effects in rubber compounds containing silica(tes) resp. chalk as fillers. They are shown to be efficient aids in the substitution of oil‐dependent carbon black by mineral filler

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051710101

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractBasis dieser neuen Gruppe von Polyurethanrohstoffen bilden dimerisierte, cycloaliphatische Isocyanate. Die bei der Dimerisierung gebildete Uretdionstruktur zeichnet sich durch deutlich abgestufte Reaktivität gegenüber verschiedenen Aminen aus. Von Reaktionsharzen, die als funktionelle Gruppen Uretdionstrukturen enthalten, werden die Härtungsreaktion und das Härtungsverhalten beschrieben. Neben den Grundlagen zum Verständnis dieser Reaktionsharze wird der Stand der Entwicklung zur technischen Nutzung aufgezeigt. Anwendungsgebiete eröffnen sich auf dem Polyurethan‐Lack‐Sektor und bei der Urethanmodifizierung von Beschichtungen und Lacken auf Epoxid

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051710102

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractBei der künstlichen und natürlichen Bewitterung von weißen Fensterprofilmustern beobachtet man häufig eine Vergilbung, die meßtechnisch verfolgt werden kann durch Erfassung des b‐Wertes. Diese Vergilbung entsteht während der Dunkellagerungsphase und wird mit der Länge der Dunkellagerung verstärkt, bis sie eine gewisse Sättigung erreicht. Bei erneuter Exposition im Freien oder im Bewitterungsgerät ist diese Vergilbung reversibel. Es liegt die Vermutung nahe, daß es sich um ein Gleichgewicht zwischen Vergilbung im Dunkeln und Ausbleichen im Hellen handelt. Hierzu wurde ein Mechanismus vorgeschlagen, der den Zerfall von unter Sonneneinstrahlung gebildeten zyklischen Peroxiden im Dunkeln beinhaltet.Als Konsequenz dieser Arbeit sollte bei der Beurteilung von weißem PVC‐Material für den Außeneinsatz immer sofort nach Ende einer Expositionszeit die Farbveränderung gemessen werden, um Fehlmessungen, die durch längeres Lagern entstehen können, zu vermeiden und wirtschaftlichen Schaden von dem Pr

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051710103

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractThe compatibility of chlorinated hydrocarbon polymers of two different comonomer sequence orders was investigated. One series of copolymers (“PVCx”) was prepared via reduction of polyvinylchloride, the other (“PECx”) via chlorination of polyethylene in solution. The blends PECx/PECy, PVCx/PVCyand PVCx/PECywere analyzed with a film casting method at 30°C and 110°C. Miscibility increases in the system PECx/PECysteadily in the direction of increasing chlorine content. Due to the comonomer sequence order in the copolymers PVCxthe systems PVCx/PVCyand PVCx/PECyshow in the range around x = 1 an extra effect favouring phase separation. In the latter system this effect is so strong that polyvinylchloride (PVCx = 1) is even incompatible with the chlorinated polyethylene PECx=1although both have the same overall co

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051710104

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractAn elastomeric microgel with reactive carboxyl groups was prepared by emulsion copolymerization of an unsaturated polyester with 2‐ethylhexyl acrylate. An epoxy resin was grafted onto the microgel particles through the addition of the carboxyl group to the epoxy group. The blend of the microgel and the epoxy resin was very stable, the microgel remained as discrete microsphere in the cured resin. The incorporation of the microgel did not cause a significant effect on the network structure of the matrix resin, while the toughness and the adhesive strength of the epoxy‐polyamide resins were improved tremendou

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051710105

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractThe isothermal and non‐isothermal crystallization of isotactic polypropylene coloured with selected organic pigments was examined by differential scanning calorimetry. It was found that the nucleating ability of pigments is connected with their chemical nature and with the reduction of the free energy for critical nucleus formation. The experimental data were analysed in terms of the well known Avrami equation.Blue pigment and Red lake are substances which accelerate the crystallization of isotactic polypropylene, while Orange pigment decreases the crystallization rate slightl

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051710106

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractThe investigated samples were cellulose nitrate CN‐85. The conductivity increases with temperature for unannealed samples and decreases with increasing time of annealing for annealed samples.The activation energy is equal for all samples and amounts to 2.1 eV in a temperature range from 322 to 385 K. The behaviour is metallic (dσ/dT)<0 for times of annealing larger than 24 h. The TSC current was measured. The position of the maximum slightly shifted towards higher temperatures with increasing rate of heating. The activation energy in the case of the TSC current was 0.21 eV and independent of the rate of heating. The dipolar relaxation time and imaginary dielectric constant were calculated theoretically and studied as a function of temperatu

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051710107

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractIn order to give the monovalent cation permselectivity to the cation exchange membrane permanently, polyethyleneimine layer was formed on the membrane surface by acid‐amide bond between polyethyleneimine and the SO2Cl groups of a styrene‐divinylbenzene copolymer membrane. After the reaction, the SO2Cl groups remaining in the inner part of the membrane were hydrolyzed by immersing the membrane into an aqueous sodium hydroxide solution.The resultant cation exchange membranes were evaluated by electrodialysis of sea water from the point of view of the monovalent cation permselectivity, electric resistance of the membrane, current efficiency, and transport number of sodium ions calculated by membrane potential in connection with reduced viscosity of the various commercial polyethyleneimines, ATR‐IR measurements on the membrane surface suggested that the acid‐amide bond was stable for severe hydrolys

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051710108

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractThe polymer blends obtained by the solution blending method show a type of compatible polymer blends. The samples obtained by compression molding the polymer blends below the melting point of the polyetheretherketon (PEEK) exhibit dynamic viscoelastic behavior characteristic of compatible polymer blends, but those by compression molding above the melting point of the PEEK show a phase separation in dynamic viscoelastic behavior.

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051710109

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractMolecular weight studies of chlorinated atactic polypropylene (CAPP), prepared by thermal chlorination of atactic polypropylene (APP), have been carried out by viscosity measurements and gel permeation chromatography. In general, the intrinsic viscosity [η], number average molecular weight (Mn) and weight average molecular weight (Mw) are dependent on degree of chlorination as well as synthesis conditions. The phenomena observed are discussed

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051710110

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY