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  • 1995-1999  (6)
  • 1850-1859
  • Biochemistry and Biotechnology  (3)
  • polymer blends  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Drop deformation during elongational flow in blends of viscoelastic fluids. Small deformation theory and comparison with experimental results (1995)
    Springer
    Rheologica acta 34 (1995), S. 525-533 
    Details
    ISSN: 1435-1528
    Keywords: Emulsion model ; polymer blends ; drop deformation ; elongational flow ; viscoelasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The deformation of dispersed droplets in immiscible polymer blends was studied in elongational flow, with an original method based on quenching specimens elongated in the melt. Results for high capillary numbers and different viscosity ratios were compared to the linear theory of viscoelastic emulsions of Palierne. Simple expressions for the drop deformation could be obtained for Maxwell fluids, and the influence of viscoelasticity of matrix and inclusions on the drop deformation process was discussed. With respect to the Newtonian approximation, the description of some experimental data could be improved. However, the predictions of the viscoelastic model appeared to be very sensitive to the choice of relaxation times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00712313
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Rheology/morphology/flow conditions relationships for polymethylmethacrylate/rubber blend (1996)
    Springer
    Rheologica acta 35 (1996), S. 369-381 
    Details
    ISSN: 1435-1528
    Keywords: Melt rheology ; linear and non-linear viscoelasticity ; polymer blends ; reinforced polymers ; morphology ; Cox-Merz rule ; aggregation ; percolation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Viscoelastic behavior, phase morphology and flow conditions relationships in polymer/rubber blends have been investigated. The importance of such correlations is illustrated on polymethylmethacrylate (PMMA)/rubber blends subjected to different flow conditions both under small and large deformations. In small-amplitude oscillatory shear (the morphology does not change during the flow) the elastic modulus G′ of the concentrated blends shows a secondary plateau, G′ p , in the low frequency region. This solid-like behavior appears for rubber particle contents beyond the percolation threshold concentration (15%). Morphological observations revealed that for concentrations higher than 15%, the particles are dispersed in a three-dimensional network-type structure. In capillary flow it was found that the network-type structure was destroyed and replaced by an alignment of particles in the flow direction. This morphological modification resulted in a decrease in both viscosity and post-extrusion swell of the blends. Morphological observations revealed that the ordered structure in the flow direction was concentrated only in the skin region of the extrudate, where the shear stress is higher than the secondary plateau, G′ p . A simple kinetic mechanism is proposed to explain the observed morphology. Similarly, steady shear measurements performed in the cone-and-plate geometry revealed alignment of particles in the flow direction for shear stress values higher than G′p.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00403538
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Crystallization of the receptor binding domain of vascular endothelial growth factor (1996)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 26 (1996), S. 353-357 
    Details
    ISSN: 0887-3585
    Keywords: VEGF ; angiogenesis ; tumor vascularization ; inclusion bodies ; cysteine mutants ; X-ray crystallography ; crystals ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Vascular endothelial growth factor (VEGF) is a potent angiogenic factor with a unique specificity for vascular endothelial cells. In addition to its role in vasculogenesis and embryonic angiogenesis, VEGF is implicated in pathologic neovascularization associated with tumors and diabetic retinopathy. Four different constructs of a short variant of VEGF sufficient for receptor binding were overexpressed in Escherichia coli, refolded, purified, and crystallized in five different space groups. In order to facilitate the product on of heavy atom derivatives, single cysteine mutants were designed based on the crystal structure of platelet-derived growth factor. A construct consisting of residues 8 to 109 was crystallized in space group P21, with cell parameters a = 55.6 Å, b = 60.4 Å, c = 77.7 Å, β = 90.0°, and four monomers in the asymmetric unit. Native and derivative data were collected for two of the cysteine mutants as well as for wild-type VEGF. © 1996 Wiley-Liss, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 4
    Electronic Resource
    Electronic Resource
    Relationship between structure and rheological properties in the melt of polymers containing spherical inclusions (1995)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 6 (1995), S. 301-308 
    Details
    ISSN: 1042-7147
    Keywords: polymer blends ; melt rheology ; crosslinked rubber ; structured latex ; 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: The linear viscoelastic behavior of model rubbertoughened polymer melts has been studied. The most significant influence of the dispersed crosslinked rubber phase on the melt rheology of the blends is the existence of a secondary plateau for the storage modulus G′ at low frequencies. This behavior was ascribed to a percolation phenomenon, leading to the formation of a threedimensional network of inclusions, and contributing to the elasticity at low frequencies of the blend. Two different systems were investigated: (a) a polystyrene matrix with crosslinked and structured latex particles and (b) silicon oil matrices with homogeneous crosslinked PMMA particles. An initial shearing history was found to influence the dynamic mechanical properties of the molten blends and in particular to lower the lowfrequency plateau value for G′. During a subsequent annealing, the plateau modulus increases again. These results are in agreement with the assumption of a particle network.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1995.220060508
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Affinity of human anti-factor VIII antibodies for functional polystyrene supports (1996)
    Chicester [u.a.] : Wiley-Blackwell
    Journal of Molecular Recognition 9 (1996), S. 401-406 
    Details
    ISSN: 0952-3499
    Keywords: derivatized polystyrene ; anti-FVIII ; affinity chromatography ; extracorporeal circulation ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Human anti-factor VIII antibodies (anti-FVIII) neutralize Factor VIII (FVIII) procoagulant activity. These antibodies appear in about 5-15 per cent of severely affected patients with haemophilia A treated with FVIII concentrates (Mannucci, 1993). In order to obtain non-thrombogenic materials able to interact specifically with anti-FVIII, amino acids residues that mimic part of the FVIII molecule recognized by anti-FVIII have been grafted. Several cross-linked polystyrenes were functionalized with sulphonate and tyrosine sulphamide groups or tyrosine derivatives sulphamide groups such as methyl ester tyrosine, or the peptides aspartic acid methyl amide tyrosine, tyrosine aspatic acid methyl amide or aspartic acid aspatic acid methyl amide tyrosine.The in vitro removal of anti-FVIII from haemophilic A plasma was performed on different supports. These polymers exhibit strong and selective affinity for the anti-FVIII. The amont of adsorbed anti-FVIII varies with the composition of the polymer and a maximum is achieved for 15-35 per cent of amino acid sulphamide groups. The influence of different chemical groups on the surface of the polymeric solid supports on the adsorption of anti-FVIII was also studied.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 6
    Electronic Resource
    Electronic Resource
    Hydrophobic vs coulombic interactions in the binding of steroidal polyamines to DNA (1996)
    Chicester [u.a.] : Wiley-Blackwell
    Journal of Molecular Recognition 9 (1996), S. 143-148 
    Details
    ISSN: 0952-3499
    Keywords: polyamines ; steroids ; DNA ; DNA binding ; hydrophobic effects ; Coulombic interactions ; guanidinium ion ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Seven new steroidal polyamines derived from bile acids, either lithocholic or deoxycholic acid, have been studied as DNA-binding agents using four complimentary methods: an ethidium displacement assay, observed changes in the thermal denaturation of poly[d(AT)], effects on hyperchromicity of DNA, and circular dichroism. In addition, modelling studies were conducted to examine the electrostatic surface potential of the polycations. The results point to a key role for a large hydrophobic surface area on the steroid in addition to the Coulombic attraction by ammonium and guanidinium groups on the steroid interacting with the polyphosphate backbone.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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