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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 195 (1992), S. 35-56 
    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: Poly-α,β-D, L-aspartamide mit funktionalisierten Carboxy-Seitengruppen wurden auf drei verschiedenen Wegen synthetisiert: (i) Aminolytische Ringöffnung von Polysuccinimid, (ii) N-Carboxymethylierung von amin-funktionalisierten Polyaspartamiden und (iii) nucleophilie Addition von Iminodiessigsäure an acryloylamino-substituierte Polyaspartamide. Die Polymeren, deren inhärente Viskositäten im weiten Bereich zwischen 5 und 30 ml g-1 liegen, wurden mikroanalytisch und spektroskopisch analysiert. Durch die Möglichkeit, Medikamente reversibel an die Carboxy-Seitengruppen zu binden, bieten sich diese Polymeren als makromolekulare Trägersubstanzen für chemotherapeutisch wirksame Substanzen an. Da sie sehr gut wasserlöslich sind, erfüllen sie eine für Trägerkomponenten in (parenteral verabreichten) Polymer-Medikament- Assoziaten unabdingbare Voraussetzung.
    Notes: Poly-α,β-D, L-aspartamides featuring carboxy-functionalized side groups are synthesized by three different preparative routes: (i) aminolytic ring opening in polysuccinimide, (ii) N-carboxymethylation of amine-functionalized polyaspartamides, and (iii) nucleophilic addition of iminodiacetic acid to acryloylamino-substituted poly-aspartamides. The polymeric products, possessing inherent viscosities in the wide range of 5-30 ml g-1, are characterized microanalytically and spectroscopically. By virtue of the carboxylic acid side groups lending themselves to the reversible covalent bonding of suitably structured drug models, the polymers are designed to function as macromolecular carriers of chemotherapeutically active agents. Being perfectly soluble in aqueous media over a wide pH range, they fulfill a crucial precondition for carrier components in (parenterally administered) polymer-drug conjugates.
    Additional Material: 1 Tab.
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  • 2
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 2247-2256 
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Blends of poly(p-phenylene vinylene) (PPV), with other polymers were made by film-casting from an aqueous mixture of the water-soluble sulfonium salt precursor to PPV and the second polymer. The rates of chemical doping, using As F5, and of electrochemical doping, using perchlorate counter ion, of the PPV component are strongly influenced by the nature of the added macromolecule. In all cases studied the blends appear to be phase separated under all conditions. The most versatile blend was with poly(ethylene oxide) (PEO), which could be heated to 225°C without degradation and which yielded the highest electrical conductivity when doped. The utility of blends was demonstrated using free-standing PPV/PEO blend samples as rechargeable battery electrodes.
    Additional Material: 5 Ill.
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  • 3
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A chromium-substituted silicoaluminophosphate molecular sieve (CrAPSO-11) and a Cr-supported SAPO-11 molecular sieve (Cr/SAPO-11) were studied by XPS and reduction-oxidation (redox) cycles. The distribution of oxidation states as well as the average oxidation state for chromium were determined for both preparations. The XPS results showed that two chromium 2p doublets (Cr(VI) and Cr(III)) were necessary to curve fit the experimen-tal data. Comparison of curve-fitting results for the two oxidic samples (O2, 773 K) revealed a significantly higher percentage of Cr(III) species in the Cr/SAPO-11 catalyst. The difference between the two samples remained following reduction (H2, 773 K). For the CrAPSO-11 sample, Cr(VI) showed a higher stability towards reduction, compared to chromium supported on conventional supports. This result suggests the incorporation of Cr(VI) into the silicoaluminophosphate framework, as mentioned in the literature. For the Cr/SAPO-11 solid, Cr(III) was extremely stable towards oxidation at 773 K. Due to the redox characteristics and the XPS results, the formation of chromia species on this catalyst is suggested.
    Additional Material: 4 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 2 (1978), S. 141-153 
    ISSN: 0308-0501
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Various aspects of Pyrolysis gas toxicity studies at the University of San Francisco are discussed. Animal response data can be used to establish patterns which would help identify specific toxicants by their mode of action. Reference time-concentration curves for individual gaseous toxicants can be used to permit deduction of importance of these toxicants in complex mixtures of toxic gases. These techniques can be used to identify cause and mechanisms of toxicity without significant additional cost. The versatility and economy of the basic test permits rapid survey of test variables to identify potential problem situations.
    Additional Material: 15 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 1 (1990), S. 275-285 
    ISSN: 1042-7147
    Keywords: Polyaspartamide-type drug carriers ; 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
    Notes: Poly-D, L-succinimide (1) is converted to copolyaspartamides of the general type 2 by sequential treatment with diamine nucleophiles R′—NH2 and R″—NH2, in which R′ is a group containing a tertiary amine function providing water solubility, and R″ represents a substituent comprising primary or secondary amino groups capable of interaction with suitably carboxyl- or carbonyl-functionalized drug models. The reactions are performed in dimethylformamide medium under mild, yet carefully controlled conditions conducive to aminolytic imide ring opening in the educt polymer without causing crosslink formation through difunctional interaction of the R″—NH2 co-nucleophile. The perfectly water-soluble polymeric products (ηinn, 5-30 ml/g), purified and isolated by dialysis (12,000-14,000 molecular mass cut-off) and freeze-drying, are of interest as macromolecular carrier species for pharmaceuticals and other biologically active agents. The drug-binding potential of the target polymers is demonstrated by the coupling, through active ester intermediacy, of phenylacetic acid as a representative drug model to selected copolyamides.
    Additional Material: 4 Tab.
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  • 6
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
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  • 7
    ISSN: 1040-0397
    Keywords: Atrazine ; Adsorption isotherms ; Electroanalysis ; Pesticide ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Differential pulse polarography was used to study the adsorption of atrazine on three tropical soils with different compositions regarding organic matter, clay, silt and sand. The corresponding Freundlich isotherms were determined and the calculated adsorption coefficients, KF, were 4.4, 9.9 and 5.2 mL g-1 for Pindorama, Monte Alegre and Ribeirão Preto soils, respectively. These values are in good agreement with previous reports. A comparison between the results obtained by differential pulse polarography and by gas chromatography was also performed showing that both techniques yield very similar isotherms.
    Additional Material: 3 Ill.
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