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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 24 (1986), S. 311-317 
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of inorganic and organometallic polymers and materials 4 (1994), S. 251-260 
    ISSN: 1572-8870
    Keywords: Kinetics ; metal exchange reaction ; Cu(II)-poly(vinyl alcohol) ; Zn(II)-EDTA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The kinetics of the metal exchange reaction between Cu(II)-poly(vinyl alcohol) [Cu(II)-PVA] and Zn(II)-ethylenediamine-N,N,N′,N′-tetraacetic acid [Zn(II)-EDTA] has been studied by mixing both solutions in a spectrophotometer at pH 10.0 to 11.0, ionic strength μ=0.10(KNO3), and 15 to 35°C. The reaction is initiated by the formation of unstable Cu(II)-H-PVA through attack of H+ ion on the Cu(II)-PVA complex, and both reactions, ligand exchange and metal exchange, proceed simultaneously. The metal exchange step may be rate determining. The rate equation and rate constants of this reaction were determined as follows: −d[Cu(II)-PVA]/dt=k 0(H)[PVA−][Cu(II)-PVA] [Zn(II)-EDTA], wherek 0(H)=k 1+(k′2+k′3)[H+],k 1=5.98±1.64M −1 s−1, andk 2+k 3=k′2 K Cu(II)-H-PVA −H +k′3 K Zn(II)-EDTA H =(5.91±0.89)×107 M −2 s−1.
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  • 3
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 825-835 
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Poly(L-glutamate) esters (3a-3d) with long alkyl side chains containing a mesogenic aromatic segment at the terminal position were synthesized. The superstructure of these polypeptides in solution and film were found to hold a α-helical conformation which was confirmed by CD, IR, and dichroic IR spectroscopy. The thermotropic liquid crystalline behavior was investigated by DSC, x-ray diffraction, and polarizing microscopy with hot stage. Polymers 3a and 3b, having transesterification over 60%, were assumed at least to have two liquid crystalline states. Polymer 3c-H-95 exhibited one crystalline state and two liquid crystalline states; however, 3d-H-97 did not show distinct liquid crystalline states.
    Additional Material: 6 Ill.
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  • 4
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 4191-4204 
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Amphiphilic active 4-dodecanoyl-2-nitrophenyl esters of dipeptide containing β-alanine (1-5) were prepared and their polycondensation was studied in detail. The critical micelle concentrations of the active esters 1-5 were determined in water by the dye method and the apparent mean aggregation number of reversed micelles formed by model compound 6 was determined by the osmotic method. The results of polycondensation can be explained by assuming that aggregations such as micelle and reversed micelle play an important role in polycondensation. The obtained new poly(dipeptide)s were examined by IR, 1H NMR, x-ray diffraction, and circular dichroism spectra.
    Additional Material: 5 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 27 (1989), S. 191-195 
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 1607-1619 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The preparation of poly(vinyl alcohol) (PVA)-poly(vinyl acetate) (PVAc) composite porous membrane was investigated by extracting PVAc with solvent from films of PVAc lattices which were obtained by the emulsion polymerization of vinyl acetate (VAc) in the presence of PVA. The formation of the porous membrane depended upon whether or not PVAc in the latex film was easily extracted with solvent. In the case of using hydrogen peroxide (HPO)-tartaric acid (TA) as an initiator, in the film of the latex which was produced from the batch method in which all ingredients of the batch were put into the reaction vessel before starting polymerization, PVAc could be extracted over 90% of total PVAc with common organic solvents. In the film of the latex which was produced from the dropwise addition method of VAc and initiator, the PVAc extraction was about 20-30%. On the other hand, in the case of using ammonium persulfate as an initiator, the desired porous membrane was not obtained. The structure of the porous membrane obtained from the latex of the batch method by using HPO - TA consisted of spherical cells which were made up of PVA and grafted PVAc or insoluble PVAc like microgels, which were not extracted with organic solvent and were connected by small pores. The PVA - PVAc composite porous membrane is permeated by n-hexane with 5.58 × 102 mL/cm2·s at 0.5 kg/cm2, by benzene with only 1.33 × 10-3mL/cm2·s even at 60 kg/cm2.
    Additional Material: 8 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 3041-3048 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Poly(vinyl alcohol) (PVAc) composite porous membrane has been prepared from PVAc latex film by extraction with acetone. The PVAc latex was prepared by emulsion polymerization of vinyl acetate in the presence of PVA, employing the hydrogen peroxide-tartaric acid systemm as an initiator. The extraction degree of PVAc could be controlled in a wide range by changing the addition method of the initiator, and, acoordingly, PVA-PVAc omposite porous membranes which had variosu void volumes were obtained. The maximum void volume attained was ca. 90%. Permation characteristics of organic solvents wre investigated on the membranes whose extraction degrees were 95.6% and 80.7%. Thge feeds were benzene, n-hexane, cyclohexane, and their mixtures. neither swelling nor shrinkage in tje appearance size of the while benzene hardly permeated even at 20 kg/cm2. The grafted PVAc in the mebrane was removed or converted into grafted PVA by treatment with sodium methylate, and then the depression of benzene permeation was lost. The grafted PVAc was suggested to be localizd on the cell wall and was found to function as a valve which closes with nenzene or a good solvent for PVAc and opens with n-haxane or a poor solvent for PVAc.
    Additional Material: 5 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 66 (1978), S. 181-191 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurden neue Polyesterimide, die einen Bicyclooctenring enthalten, durch Polykondensation von N,N′-Dicarboxymethyl-(bicyclo[2.2.2]oct-7-en-2,3,5,6-tetracarbonsäurediimid)-dimethylester und N,N′-Dicarboxyphenyl-(bicyclo[2.2.2]oct-7-en-2,3,5,6-tetracarbonsäurediimid)-dimethylester mit verschiedenen aliphatischen Diolen hergestellt. So dargestellte Polymere sind in m-Kresol, Dimethylformamid, Dimethylacetamid und Dimethylsulfoxid löslich, mit Ausnahme der mit äthylenglycol dargestellten. Die Polymeren waren bis oberhalb 350°C thermisch stabil.
    Notes: New polyesterimides containing a bicyclo-octene ring were synthesized by the polycondensation reaction of N,N′-dicarboxymethyl(bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylic acid diimide)dimethylester and N,N′-dicarboxyphenyl(bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylic acid diimide)dimethylester with various aliphatic diols. These polymers thus obtained are soluble in m-cresol, dimethylformamide (DMF), dimethylacetamide (DMAc) and dimethylsulfoxide (DMSO) except those from ethylene glycol. The polymers showed thermal stability above 350°C.
    Additional Material: 2 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 68 (1978), S. 55-65 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Eine Reihe aliphatischer und aromatischer Polyamidimide, die einen Bicyclooctenring enthielten, wurden synthetisiert. Die Polykondensation wurde bei niedriger Temperatur in Lösung durchgeführt, wobei eine Reihe von N,N′-Diaminen sowie N,N′-Dichlorformylmethyl-[bicyclo-(2.2.2)-oct-7-end-2,3,5,6-tetracarbonasäure-2,3,5,6-diimid] (2) eingesetzt wurden. Die meisten so erhaltenen Polymeren waren in m-Kresol, DMF, DMAc und DMSO löslich. Die Viskositätszahlen der Polymeren wurden in DMF bei 25°C bestimmt und lagen zwischen 0,07 und 0,40 dl/g. Die Polymeren aus 2 und aromatischen Diaminen zeigen thermische Stabilitäten bis über 380°C. Die aliphatischen Polymeren waren nicht so stabil wie die aromatischen.
    Notes: A series of aliphatic and aromatic polyamideimides containing a bicycloöctene ring were synthesized. Low-temperature solution condensation polymerization involving various diamines and N,N′-dichloroformylmethyl-[bicyclo-(2.2.2)-oct-7-ene-2,3,5,6-tetracarb-oxylic acid 2,3,5,6-diimide] (2) were employed. Most of these polymers thus obtained were soluble in m-cresol, DMF, DMAc and DMSO etc. The inherent viscosities of the polymers ranged from 0.07 to 0.40 dl/g (in DMF at 25°C). The polymers obtained from 2 and aromatic diamines showed thermal stabilities above 380°C. The aliphatic polymers were more unstable than the aromatic polymers.
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