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  • Chemistry  (103)
  • SPACE RADIATION  (25)
  • PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR  (12)
  • 1
    Digitale Medien
    Digitale Medien
    Water sorption on deoxygenated hemoglobins CC, SC, SS, AS, and AA (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 1653-1659 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Five human hemoglobins whose genetic relationship to one another involves one set of alleles, hemoglobins CC, SC, SS, AS, and AA, were studied in the deoxygenated form within a McBain gravimetric sorption system at 28°C. Water was used as the adsorbate at relative vapor pressures ranging from 0.11 to 0.39. The results of this study are reported and compared with a similar study on the ferric form of these same five hemoglobins. For both forms of hemoglobin studied, a slight increase was measured in the number of polar sites accessible to H2O vapor for those genotypes in which the substituent in the sixth position from the N terminus of the two β chains had a positively charged side chain, i.e., hemoglobin C. Those samples containing hemoglobin S (less soluble in the deoxy form) show an increased BET monolayer coverage in the deoxy as compared to the ferric form. For each genotype, the deoxygenated form had more polar sites accessible to H2O vapor than its ferric form. This finding is in agreement with an increase in the size of the central cavity as shown by crystallographic analysis.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.1974.360130811
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  • 2
    Digitale Medien
    Digitale Medien
    Crystal Structure of Bis(η6-mesitylene)iron(II) Hexafluorophosphate (1992)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 75 (1992), S. 294-302 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The crystal Structure of [Fe(η6-mesitylene)2](PF6)2 (1) is reported. The Structure is intricately disordered with the Fe-atom occupying an m3m cubic site, but nonetheless the conformation and bonding is confirmed. The structure is discussed in the general context of FeII sandwich complexes.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19920750126
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  • 3
    Digitale Medien
    Digitale Medien
    Polymer modification and synthesis using sulphenyl derivatives, 1. Preparation of poly(ß-chlorothioethers) (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 173 (1973), S. 5-11 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Darstellung und Charakterisierung einiger neuer Poly(ß-chlorthioäther) aus der Reaktion von 4,4′-Biphenyldisulfenylchlorid (1) oder Benzol-1,3-disulfenylchlorid (2) mit Diolefinen werden beschrieben.
    Notizen: The preparation and characterization of some novel poly(ß-chlorothioethers), from reaction of 4,4′-biphenyldisulphenyl chloride (1) or benzene-1,3-disulphenyl chloride (2) with diolefins, are described.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1973.021730101
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  • 4
    Digitale Medien
    Digitale Medien
    Graft copolymers of polytetrahydrofuran and butyl rubber, 1. Cationic copolymerisation of tetrahydrofuran with bromobutyl rubber (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 17-23 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Graft copolymers of butyl rubber (BR) with polytetrahydrofuran (PTHF) were prepared from bromobutyl rubber by a cationic “grafting-from” reaction initiated by silver perchlorate at allylic bromine sites on the rubber. By studying the influence of variables, such as temperature etc., it was shown that initiation at -20°C for 30 min, followed by polymerisation at 0°C with a [AgClO4]/[Br] ratio of ca. unity, produced near optimum reaction conditions with grafting efficiencies 〉90%. Copolymers containing upto 40% of grafted PTHF were obtained by this means. The BR-g-PTHF copolymers have a two-phase morphology comprising amorphous BR with crystalline domains of PTHF which function as points of reinforcement in the rubber upto ca. 300 K.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1990.021910102
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  • 5
    Digitale Medien
    Digitale Medien
    Polymer modification and synthesis using sulphenyl derivatives, 2Part 1, cf.1.. Preparation of poly(β-chlorothioether)s, poly(sulphone)s and poly(disulphide)s (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 9-21 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Die Darstellung einer weiteren Reihe Poly(β-chlorthioäther) aus der Reaktion von 4,4′-Methylendisulfenylchlorid (2) mit Diolefinen wird beschrieben. Poly(sulfon)e wurden durch kontrollierte Oxidation der Poly(β-chlorthioäther) aus 2 und aus 4,4′-Biphenyldisulfenylchlorid (1), Poly(disulfid)e durch die Reaktion von 1 oder 2 mit Dithiolen oder metallischem Lithium dargestellt. Sämtliche Polymere wurden durch ihre IR-, NMR-Spektren bzw. Elementaranalysen und durch Molekulargewichtsbestimmungen charakterisiert.
    Notizen: The preparation of a further series of poly(β-chlorothioether)s, from reaction of 4,4′-methylenedisulphenyl chloride (2) with diolefins, is described. Poly(sulphone)s were prepared by controlled oxidation of the poly(β-chlorothioether)s from 2 and from 4,4′-biphenyldisulphenyl chloride (1). Poly(disulphide)s were prepared by reaction of 1 or 2 with dithiols or lithium metal. All the above polymers were characterized by NMR, IR, elemental analysis, and rel. mol. mass determinations.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1975.021760102
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  • 6
    Digitale Medien
    Digitale Medien
    Polymer modification and synthesis using sulphenyl derivatives, 3Part 2: cf.1.. Alternating disulphide copolymers (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 1523-1528 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1975.021760522
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  • 7
    Digitale Medien
    Digitale Medien
    Polymer modification and synthesis using sulfenyl derivatives, 5.Part 4, cf.9. Adducts with cis-1,4-polybutadiene (1977)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 1739-1744 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: cis-1,4-Polybutadiene (PBD) was reacted with a number of sulfenyl derivatives to produce adducts of varying degrees of saturation. The glass transition temperature (Tg) of the modified polymer increases with extent of reaction with p-toluenesulfenyl chloride (1c) and 2-nitrobenzenesulfenyl benzoate (2a). DSC traces indicate a “blocky” structure in adducts of 1c but not of 2a. The tensile strengths at break of the adducts of 1c show a progressive increase with increasing degree of saturation.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1977.021780615
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  • 8
    Digitale Medien
    Digitale Medien
    Polymer modification and synthesis using sulfenyl derivatives, 11Part 10: cf.6.. New polymers from oxidation of adducts of benzene- and toluenesulfenyl chlorides with cis-1,4-polybutadiene (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 1029-1033 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Adducts of cis-1,4-polybutadiene with both benzene- and toluenesulfenyl chlorides were conveniently oxidised in a second stage modification with m-chloroperbenzoic acid to yield novel sulfone thermoplastic polymers. These have higher glass transition temperatures and are more thermostable than the parent adducts.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1980.021810507
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  • 9
    Digitale Medien
    Digitale Medien
    Chemical modification of polydienes, 2Part 1: cf.1. Properties of polybutadiene and nitrile rubbers grafted with poly(tetrahydrofuran) (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 1645-1651 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Thermal analysis by differential scanning calorimetry (DSC) indicated that graft copolymers of poly(tetrahydrofuran) (PTHF) on a nitrile rubber containing 39 wt.-% acrylonitrile have a two-phase morphology comprising crystalline PTHF and amorphous rubber. In rubbers with an 18 wt.-% acrylonitrile content the PTHF is more compatible with the rubber and exerts a plasticising effect; crystallinity of the PTHF is not as well developed. cis-1,4-Polybutadiene and PTHF are partially miscible and in grafts on these two the melting endotherm of the latter was not detected. The relative values of the solubility parameters of PTHF and the three rubbers are consistent with this behaviour. All graft copolymers have a fairly low thermal stability and begin to decompose under N2 below 200°C. Degradation appears to be initiated at the PTHF grafts. Graft copolymers of PTHF with nitrile rubbers are less resistant to petroleum than the ungrafted rubbers.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1983.021840810
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  • 10
    Digitale Medien
    Digitale Medien
    Chemical modification of polydienes, 3Part 2: cf.2.. Copolymers with polytetrahydrofuran by grafting-from butadiene polymers (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 2763-2774 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Polybutadienes of various microstructures and some butadiene copolymers were epoxidised to low levels (〈1 mol-%) with m-chloroperbenzoic acid. The epoxide groups functioned as initiation sites for a “grafting-from polymerization” of tetrahydrofuran (THF) catalysed by BF3. By conducting the reaction in dilute THF solution ([Monomeric unit] 〈 0,3 mol · 1-1) with a large excess of BF3 over epoxide groups, gel formation was avoided. The conversion of THF was less than 2% and the copolymers contained from 10 to 50% polytetrahydrofuran (PTHF) comprising graft chains of molar mass up to 43000 g · mol-1. The relative rate of grafting tended to decrease as the content of trans-1,4 units in the backbone polymer increased, and, unusually, there was a small increase in volume during the graft copolymerization. The graft copolymers had a two-phase morphology consisting of amorphous rubber and crystallites of PTHF. The latter function as physical crosslinks which break down above the melting point of PTHF, so that the materials behave as thermoplastic elastomers.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1986.021871203
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