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  • 1
    Electronic Resource
    Electronic Resource
    The glass transition of blends of poly(2,6-dimethylphenylene oxide) and polystyrene-block-poly(2,2-dimethyltrimethylene carbonate) (1991)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 2985-2991 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The miscibility of poly(2,6-dimethylphenylene oxide) (PPO) with polystyrene-block-poly(2,2-dimethyltrimethylene carbonate) (PS-block-PDTC) was studied and compared with the corresponding PPO/PS blends. PPO/PS-block-PDTC blends show two thermal transitions in the temperature range investigated; that is the melting of the DTC block and the glass transition of the mixed PPO/PS block phase. The Tg values obtained are discussed by means of the Fox and Gordon-Taylor equation. The influence of the PDTC block leads to higher Tg values of the PPO/PS block mixture than of the corresponding homopolymer blend.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1991.021921214
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  • 2
    Electronic Resource
    Electronic Resource
    Studies on polyamide 3  -  synthesis, characterization and properties (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 2561-2569 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis of polyamide 3 (PA 3) by hydrogen transfer polymerization is described. The reaction proceeds homogeneously in N,N-dimethylacetamide/LiCl in contrast to the heterogeneous reaction in 1,4-dioxane and pyridine. By IR, NMR, differential scanning calorimetry and extraction experiments it was shown that the reaction product is nearly pure PA 3.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1992.021931006
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  • 3
    Electronic Resource
    Electronic Resource
    Miscibility behavior in blends of poly(2,6-dimethylphenylene oxide) and random or block copolymers of styrene with methyl methacrylate (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 243-250 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Miscibility in blends of poly(2,6-dimethylphenylene oxide)Systematic IUPAC name: poly[oxy(2,6-dimethyl-1,4-phenylene)]. (PPO) with random or block copolymers of styrene and methyl methacrylate (MMA) was studied by light microscopy and glass transition temperature measurements. Blends of PPO and the random copolymers were found to be miscible up to a copolymer content of 18 wt.-% MMA. The transition from miscibility to immiscibility in these blends in independent of temperature in the range 100 to 350°C. From these data, the segmental interaction parameter between units of the homopolymer and MMA, χPPO/PMMA is estimated to be about 0,5. Blends of PPO and the block copolymers of styrene and MMA used behave essentially as the corresponding homopolymers in terms of miscibility.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910120
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  • 4
    Electronic Resource
    Electronic Resource
    Miscibility in blends of random copolymers of styrene and acrylontrile with block copolymers of styrene and methyl methacrylate (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 1623-1631 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Phase behavior in blends of random copolymers of styrene and acrylonitrile with block copolymers of styrene and methyl methacrylate was studied by light scattering, light microscopy and glass transition temperature measurements. The results are compared with those of respective blends containing random copolymers of styrene and methyl methacrylate. In terms of macrophase separation, the block copolymers display a more extended miscibility domain with styrene/acrylonitrile copolymers than the random copolymers. However, the extent of the miscibility domain varies as a function of temperature. Unlike the random copolymer blends, all blends containing block copolymers exhibit lower critical solution temperature behavior. Finally, it is established that the systems studied here undergo spinodal decomposition leading to macrophase separation.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910714
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  • 5
    Electronic Resource
    Electronic Resource
    Theoretical study of recycling in preparative chromatography (1993)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 39 (1993), S. 809-819 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Using the equilibrium-dispersive model of chromatography, we have investigated recycling as a means to improve the recovery yields and possibly the production rates of chromatographic separations. When compared with the optimal values obtained for the conventional single-cycle regime, our results prove the potential for recycling in preparative chromatography. The analysis performed for the separation of two binary mixtures demonstrates that recycling not only improves the recovery yield but can increase the production rate under certain conditions. Different possibilities of collecting sufficiently separated fractions during recycling are compared. The mathematical model developed can be used effectively for designing optimal recycling strategies in preparative liquid chromatography.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690390509
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of intraparticle transport parameters for multicomponent adsorptionPaper presented by P.S. Carl at the “Jahrestreffen der Verfahrens-Ingenieure”, Stuttgart, October 3 to 5, 1990. (1992)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 15 (1992), S. 131-137 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper is devoted to the problem of determining intraparticle transport coefficients for multicomponent adsorption from experimental kinetic curves. Due to thermodynamic and kinetic interactions between the mixture's components, this task is more difficult than for single component systems. As an example, the kinetics of adsorption on activated carbon of binary mixtures of phenol and indole from aqueous solutions was studied in a continuous stirred tank adsorber (CSTA). To describe the intraparticle transport of this system, the surface diffusion model using a linear driving force (LDF) was applied. For determining the matrix of the unknown kinetic parameters of the LDF-model, the application of three independent mathematical methods is discussed. Firstly, a semi-analytical calculation (SA) of the intraparticle transport parameters by solving a system of linear equations on the basis of an empirical description of experimental kinetic curves is put forward. Secondly, a non-linear regression (NR) method for parameter estimation was applied. The third method is a non-linear regression which, in contrast to the SA and NR methods, guarantees the stability of the system of differential equations in the steady state of the process (NRS).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270150210
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  • 7
    Electronic Resource
    Electronic Resource
    Untersuchung einer heterogen katalysierten Gasphasenreaktion mittels dynamischer Methoden bei erhöhtem Druck (1994)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 1378-1382 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330661016
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen zur anionisch initiierten Blockcopolymerisation polarer Monomere (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 300-304 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The synthesis of living, polymerizing active oligomers and their usage for the following polymerization of acrylonitrile is described. The results of the application of oligo(styryllithium) as intitiator for blockcopolymers of the type polystyrene-b-methyl methacrylate are reported.
    Notes: Die Arbeit enthält Untersuchungen zur Synthese lebender, polymerisationsaktiver Oligomere und deren Anwendung als Makroinitiatoren für die nachfolgende Acrylnitrilpolymerisation. Die Ergebnisse zur Anwendung von Oligostyryllithium als Initiator für Blockcopolymere des Typs Poly(styren-b-methacrylat) werden mitgeteilt.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420703
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  • 9
    Electronic Resource
    Electronic Resource
    Synthese und charakterisierung der in anionischen systemen hergestellten polaren hybridmakromoleküle (1992)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 43 (1992), S. 38-46 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Synthesis and characterization of graft and block copolymers prepared of polar monomers are described. Activation of P2VP-, P4VP-, PVAC-, and PMMA-chains is necessary for subsequent addition of monomers. The reactions taking place are discussed in more detail. Well defined synthesis of block copolymers is achieved, if the short living time of AN chains is used for the addition of the monomers. The investigation of chemical heterogeneity of these copolymers is difficult.
    Notes: Pfropf- und Copolymere aus polaren Monomeren werden hinsichtlich ihrer Synthese und Charakterisierung näher beschrieben. Im Falle der Pfropfcopolymere sind aktivierte P2VP-, P4VP, PVAC- und PMMA-Ketten die Voraussetzung für die Monomeraddition. Dabei ablaufende mögliche Reaktionen werden diskutiert. Gut definierte Blockcopolymere sind zugänglich, wenn die kurze Lebensdauer der AN-Ketten für die weitere Monomeranlagerung ausgenutzt wird. Die Untersuchung der chemischen Uneinheitlichkeit derartiger Systeme ist kompliziert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1992.010430109
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  • 10
    Electronic Resource
    Electronic Resource
    Cellulose-Poly(Acrylnitril)-Blends. Herstellung, Eigenschaften und Verarbeitung von Löusungen in LiCl/N,N-DimethylacetamidHerrn Professor Dr. habil. Burkart Philipp zum 65. Geburstag gewidmet (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 86-91 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The dissolution of cellulose-poly(acrylonitrile) blends in LiCl/dimethyl acetamide is described. A phase diagram of the mixture solutions was established. Films and fibres prepared from the cellulose/PAN solution exhibit a two-phase morphology. Polymer-polymer interactions can be formed in the phase boundary layer.
    Notes: Die Auflösung von Cellulose/PAN-Blends in LiCl/Dimethylacetamid wird beschrieben, und ein Phasendiagramm dieser. Mischlösungen wird ermittelt. Aus den Cellulose/PAN -Lösungen können Folien und Fasern hergestellt werden, die eine Zweiphasenmorphologie besitzen. Im Bereich der Phasengrenzfläche können sich Polymer-Polymer-Wechsel-wirkungen ausbilden.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010410204
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