摘要:

AbstractSome disubstituted ferrocenes and a polymer with flexible pendant ferrocenyl mesogens were found to form a complex with tetracyanoethylene to give a spin molecule even in the solid state at ambient temperature.

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160101

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractThe cationic bioxazoline Pd(II) complex2catalyzes the alternating copolymerization of carbon monoxide with styrene and 4‐methylstyrene, respectively, to yield a highly isotactic optically active polymer at room temperature and low carbon monoxide pressure (1–4 a

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160102

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractA very cheap catalyst, a silica‐supported polystannazane‐copper complex (abbreviated as SiO2SnNCu) was prepared by the reaction of the silica‐supported polystannazane ligand with CuCl2in ethanol. The results showed that SiO2SnNCu can catalyze the oxidation of methanol to formaldehyde in high yield at mild conditions, i.e. at 40°C and 1 atm of oxygen. The catalyst could be recovered and could catalyze the r

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160103

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractThe length of chain segment motion needed for the crystallization of guttapercha from rubbery state was found to be around 180 CC bonds of the backbone chain. Thus, the crystallization process from the rubbery state or from the melt is not through chain folding, and the solidification model is a more appropriate physical picture of the proces

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160104

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractNew polyurethanes (4a, 4b) and a segmented polyurethane (4c) bearing phosphatidylcholine moieties in the main chain were synthesized. They are thermally stable up to 300°C and show the viscosity behaviour of common polyelectrolytes. Preliminary studies suggest that these polyurethanes are interesting new biomaterials

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160105

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractThe selective carboxylation of 4‐biphenylcarboxylic acid with carbon tetrachloride in aqueous alkali to obtain 4,4′‐biphenyldicarboxylic acid was achieved by the use of ß‐cyclodextrin and copper powder II under mild co

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160106

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractPolymethacrylates with laterally attached azobenzenes were prepared to cause molecular reorientation of this chromophore in their thin films by linearly polarized irradiation with an exposure energy of less than ca. 100 mJ/cm2. A homogeneous alignment was induced by assembling a nematic liquid crystal cell using a substrate plate covered with the photoirradiated films. The alignment direction of the cell was controlled by changing the electric vector of the actinic light.

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160107

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractIn the search for organic ferromagnets polymers with a conjugated backbone and pendant persistent radicals are one route of interest. The synthesis of poly[4‐(4‐ethynylphenyl)‐2′,4′,6′‐trinitro‐2,6‐diphenyldiphenylamine](p‐3)and poly[4‐(3‐ethynylphenyl)‐2′,4′,6′‐trinitro‐2,6‐diphenyldiphenylamine](m‐3)as precursors of polyradicals are described. A dinuclear rhodium cyclooctadiene chloride complex as polymerization catalyst was used to yield polymers with molecular weights (gel‐permeation chromatogr

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160108

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractThe porous copolymer films ofN‐methacryloyl‐L‐alanine methyl ester and diethyleneglycol‐bis‐allylcarbonate (diallyl oxydiethylene dicarbonate) were hydrolyzed with 1MNaOH solution for 40 min at 25°C. The pores of the films showed pH response in diameter. The pore diameter of 3,7 μm in the buffer solution of pH 3 was closed complet

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160109

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractBinary blends of poly(vinyl chloride) (PVC) and chitin‐graft‐poly(2‐methyl‐2‐oxazoline) showed miscibility in the blend fraction range of the latter lower than ca. 10 wt.‐%. The glass transition temperature of PVC, which was determined by differential scanning calorimetry, changed to lower temperatures with increasing modified chitin contents up to 10 wt.‐%. Segmental interaction between PVC and the graft copolymer was confirmed by the carbonyl stretching band shift in the F

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160110

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY