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  • 1985-1989  (416)
  • 1987  (416)
  • Polymer and Materials Science  (406)
  • Magnetic resonance imaging
  • Nuclear reactions
  • 1
    Electronic Resource
    Electronic Resource
    Effect of hydrostatic pressure on the electrical conductivity of FEF carbon black-loaded sbr vulcanizates (1987)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 150 (1987), S. 21-32 
    Details
    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 wurde die elektrische Leitfähigkeit von Styrol-Butadien-Kautschuk (SBR-1502), der mit unterschiedlichen Konzentrationen von sehr schnell spritzbarem Furnace-Ruß (70, 80, 90 und 100 phr) beladen war, untersucht. Auf der Basis des Modells von Holm wurde eine qualitative Beschreibung für die elektrische Leitfähigkeit durch diese Verbundstoffe gesucht. Der Druckkoeffizient K wurde berechnet und zeigte eine starke Abhängigkeit von den Rußkonzentrationen.
    Notes: The electrical conduction was investigated in styrene butadiene rubber (SBR-1502) loaded with different concentrations of fast extrusion furnace (FEF) black (70, 80, 90, and 100 phr). On the bases of Holm's model, a qualitative description for the electrical conduction through these composites was sought. The pressure coefficient K was calculated and found to be strongly dependent on the carbon black concentrations.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1987.051500103
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  • 2
    Electronic Resource
    Electronic Resource
    Graft polymerization of acrylic monomers onto starch fractions. IV. Effect of reaction time on the grafting of butyl acrylate onto amylose (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 25 (1987), S. 719-725 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies were carried out on the grafting of butyl acrylate (BA) to amylose by the ceric ion method. After removing the homo-PBA with THF and toluene, and the ungrafted amylose with 0.5NNaOH, the PBA content of the graft copolymers was determined by acid hydrolysis with 1N HCl. The influence of reaction time on the grafting yields was determined and the largest values were: 82% for the grafting efficiency, 246% for the percent grafting, 62% for the grafted amylose, 48% for the grafted PBA, and 64% for the total conversion.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1987.080250223
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  • 3
    Electronic Resource
    Electronic Resource
    Study of the ceric ion behavior on the initiation of butyl acrylate polymerization onto amylose (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 25 (1987), S. 1309-1314 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A study of the Ce(IV) ion consumption during graft polymerization of butyl acrylate with amylose was carried out. The Ce(IV) consumed was ca. 80% and the ratio of Ce(IV) to anhydroglucose units was 1/15. Poly(butyl acrylate) (PBA) chains were isolated from the grafted copolymer by the perchloric acid hydrolysis method. The molecular distribution was obtained by gel permeation chromatography (GPC). The number-average molecular weight (Mn) of the grafted chains was 276,000 and the weight-average molecular weight (Mw) was 1,320,000. The total number of grafted chains (mmol) ranged from 0.4410-3 to 8.710-3 (amylose from 0.08 g to 1.23 g). Frequency of grafting ranged from 1042 to 704.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1987.080250509
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  • 4
    Electronic Resource
    Electronic Resource
    Polyester mortar (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 33 (1987), S. 1609-1622 
    Details
    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 basic properties of polyester resin mortar have been studied. These properties included compressive strength, flexural strength, modulus of elasticity, shrinkage, and resistance to sulfuric acid. The main variables were the polymer content, the ratio of coarse sand to filler, the method of curing, and the age. The properties of Portland cement mortar were also studied for comparison.Polyester mortar shows a higher rate of hardening, higher strength, and higher resistance to sulfuric acid than cement mortar. On the other hand, polyester mortar shows lower modulus of elasticity and higher shrinkage than cement mortar.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070330516
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation of the polymer bearing pendant quinonoid groups by UV irradiation and its photocrosslinking (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 25 (1987), S. 3173-3176 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1987.080251119
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  • 6
    Electronic Resource
    Electronic Resource
    Order parameters of gels and gelation kinetics of aqueous agarose systems: Relation to the spinodal decomposition of the sol (1987)
    New York : Wiley-Blackwell
    Biopolymers 26 (1987), S. 743-761 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hydrogels of a significant biostructural polymer (agarose) were studied turbidometrically in the course of their isothermal self-assembly. Supramolecular order was characterized by an order parameter and associated correlation length. This type of characterization, in general, may help more in the quantitative measurement of order in biostructures. The picture of processes leading to isothermal gelation appears much richer than expected, and it is probably of more general validity, as it agrees with predictions based on the statistical model of site-bond correlated percolation. At the higher temperatures a spinodal decomposition occurs well before, and possibly triggers [P. L. San Biagio, et al. (1986) Biopolymers 25, 2255-2269], the start of gelation. In this case, the spatial modulation of concentration, as well as topological features of the gel, appear to reflect those of the spinodally decomposed sol. When an upper limit is approached for the temperature of isothermal gelation, both the order parameter and the correlation length exhibit a critical-like behavior. At lower temperatures, the sequence of processes and the resulting features of the gel appear dictated by the (temperature- and concentration-dependent) interplay of spinodal decomposition and gelation processes and kinetics. The present results are believed to provide a basis for a deeper understanding of the relation between the processes of gelation and of spinodal decomposition, and between their time scales.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360260513
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  • 7
    Electronic Resource
    Electronic Resource
    An in vitro study of the adhesion of blood platelets onto vascular catheters. Part I (1987)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 21 (1987), S. 613-627 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The adhesion of human blood platelets onto vascular catheters was studied using a specially designed perfusion chamber. Polyurethane catheters were exposed to citrated human blood for different periods (up to 20 min) and at different wall shear rates (190, 260, 330 sec-1). The rate of platelet adhesion was determined using 111In-labeled platelets, while the morphology of adhering platelets was investigated using scanning electron microscopy. A linear increase in platelet adhesion was found within the first 10 min of perfusion, after which a plateau value was reached. The number of adhering platelets did not vary significantly with the shear rates applied, which may indicate that within the range of shear rates studied, the adhesion of platelets onto the catheter surface is mainly determined by the rate of the reaction between the platelets and the material surface. Catheters coated with a conjugate of heparin and albumin showed a four- to five-fold reduction in platelet adhesion as compared to uncoated catheters. This reduction in platelet adhesion was not only due to the presence of albumin moieties at the surface but also to the presence of heparin residues in the adsorbed albumin-heparin conjugate.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820210507
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  • 8
    Electronic Resource
    Electronic Resource
    New modified alkyd compositions (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 543-547 
    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: Alkydharze können durch Einbau eines Imidgliedes in die Alkydkette modifiziert werden. In dieser Arbeit werden verschiedene Kondensationsprodukte aus dibasischen Säuren und Harnstoff eingebaut, nämlich Tetraphthalylharnstoff, Tetraoxalylharnstoff und Tetrasuccinylharnstoff. Mit Ausnahme des Tetraoxalylharnstoffs bewirkt diese Modifizierung eine beträchtliche Verbesserung der Eigenschaften der Filme.
    Notes: Alkyd resins can be modified by insertion of an imide linkage in the alkyd backbone. In this investigation, various dibasic acid-urea condensation products were incorporated, namely, tetraphthalyl urea, tetraoxalyl urea and tetrasuccinyl urea. Such modification resulted in a considerable improvement in film performance and durability, except in case of the tetraoxalyl urea modified alkyds.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010380908
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  • 9
    Electronic Resource
    Electronic Resource
    Polymerization and copolymerization of methyl methacrylate and styrene in the presence of copper(II) chloride (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 619-621 
    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: Die Polymerisation und Copolymerisation von Styren und Methylmethacrylat in Lösung in Gegenwart von Cupfer(II)chlorid wurden untersucht. Die Zusammensetzung der Copolymere wurde durch 1H-NMR bestimmt. Die Reaktivitätsparameter wurden berechnet. Cupfer(II)chlorid beeinflußt die Tendenz zur Bildung alternierender Copolymere.
    Notes: Polymerization and copolymerization of styrene and methyl methacrylate in solution were investigated in presence of copper(II) chloride. Copolymer compositions were determined by 1H-NMR analysis and monomer reactivity ratios were calculated. Copper(II) chloride affected the tendency of the formation of an alternating copolymer.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010381107
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  • 10
    Electronic Resource
    Electronic Resource
    Enzymes and drugs immobilized on polymers. Synthesis and application in therapeutics (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 145-148 
    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: Verschiedene Enzyme (α-Amylase, Amyloglucosidase) und Arzneistoffe (Procain, 7-Amino-Cephalosporansäure, Sulfatiasol, Ampicillin, Chloramphenicol) wurden covalent an Cellulosederivate und Biozan R gebunden, um biologisch aktive Verbindungen zu erhalten. Die Kopplungsreaktion wurde unter Verwendung von Dicyclohexylcarbodiimid als Aktivator durchgeführtß. Die optimalen Werte der Reaktionsparameter (Temperatur, Zeit, Konzentration der Arzneistoffe, Trägermenge, Aktivatorkonzentration) wurden bestimmt.
    Notes: Different enzymes (α-amylase, amyloglucosidase) and drugs (procaine, 7-aminocephalosporanic acid, sulphathiazole, ampicillin, chloramphenicol) have been immobilized on cellulose derivatives and Biozan R through covalent bonds to obtain biologically active compounds. Coupling reaction of drugs was achieved by using dicyclohexyl carbodiimide as activating agent. Optimum parameters (temperature, time, drug concentration, matrix amount, activator concentration) were found.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010380211
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