摘要:

AbstractComplexes of poly(2‐acrylamidobenzoic acid) with transition metals were prepared and characterized by elemental analysis, electronic and vibration spectroscopy, and magnetic moment measurements. The thermal stabilities of the formed polymer complexes were compared with that of the poly(2‐acrylamidobenzoic acid) homopolymer by means of thermogravimetric analysis. The activation energies of the thermal degradation of the polymer complexes were calcula

ISSN:0323-7648    

DOI:10.1002/actp.1990.010410111

出版商:Akademie Verlag GmbH    

年代:1990

数据来源: WILEY

摘要:

AbstractThermoelectrets of CR‐39(DOP) were formed and their thermally stimulated discharge current studied. In the present work, effects of different forming temperatures, polarizing fields and storage times have been studies with a view to understand the electret behaviour of this material. The polarization seems to have a dipolar origin. The activation energy and relaxation times have also been calculate

ISSN:0323-7648    

DOI:10.1002/actp.1990.010410112

出版商:Akademie Verlag GmbH    

年代:1990

数据来源: WILEY

摘要:

AbstractThe dielectric properties of three epoxy resins have been studied as a function of frequency and temperature. The de conductivity of the samples was measured at different temperatures. A comparison of the results shows that the dielectric properties are dependent on the epoxide value, while the de conductivity depends mainly on the molecular weight of the epoxy resins.

ISSN:0323-7648    

DOI:10.1002/actp.1990.010410113

出版商:Akademie Verlag GmbH    

年代:1990

数据来源: WILEY

摘要:

AbstractLineare vinylgruppenhaltige Poly(dimethylsiloxane) können durch eine photoinitiierte Radikalbildung in vernetzte Proben überführt werden. In CHCI3‐Lösungen erreichen die Quantenausbeuten der Doppelbindungsabnahme (Φp) Werte von 0,9 bis 2,5 Sie hängen vom Initiatortyp ab und sinken bei Erhöhung der Siliconkonzentration. Für lösungsmittelfreie Systeme kann ein ΦP‐Wert von 0,01 extrapoliert werden. Unter solchen Bedingungen erfolgt die Netzwerkbildung besonders effektiv mit Benzoinderivaten. Mit steigendem Vinylgruppengehalt der Silicone erhöht sich die Netzwerkdichte. IR‐spektroskopische Untersuchungen mit Benzoinderivaten als Initiator und die Charakterisierung der entstandenen Netzwerke zeigen, daß die Netzwerkbildung fast ausschließlich über die V

ISSN:0323-7648    

DOI:10.1002/actp.1990.010410114

出版商:Akademie Verlag GmbH    

年代:1990

数据来源: WILEY

摘要:

AbstractThe polymerization of methacrylic acid has been carried out using K2S2O8in conjunction with different reducing agents as initiators. The effects of the type of reductant, concentrations of oxidant, reductant and methacrylic acid, as well as degree of neutralization of the monomer have been investigated in dependence on polymerization time and temperature.

ISSN:0323-7648    

DOI:10.1002/actp.1990.010410115

出版商:Akademie Verlag GmbH    

年代:1990

数据来源: WILEY

摘要:

AbstractDifferent resins were prepared by polycondensation of bisphenol A with compounds which may be produced during the acid hydrolysis of bagasse pith, e.g., glucose, xylose, and furfural. Further bisphenol A was condensed with constituents of bagasse pith, namely, pure soda lignin, holocellulose and resistant cellulose. The optimum conditions for thin layer chromatographic separation of these polycondensates were determined.

ISSN:0323-7648    

DOI:10.1002/actp.1990.010410116

出版商:Akademie Verlag GmbH    

年代:1990

数据来源: WILEY

ISSN:0323-7648    

DOI:10.1002/actp.1990.010410117

出版商:Akademie Verlag GmbH    

年代:1990

数据来源: WILEY

ISSN:0323-7648    

DOI:10.1002/actp.1990.010410118

出版商:Akademie Verlag GmbH    

年代:1990

数据来源: WILEY

ISSN:0323-7648    

DOI:10.1002/actp.1990.010410119

出版商:Akademie Verlag GmbH    

年代:1990

数据来源: WILEY

ISSN:0323-7648    

DOI:10.1002/actp.1990.010410121

出版商:Akademie Verlag GmbH    

年代:1990

数据来源: WILEY