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  • 1
    Electronic Resource
    Electronic Resource
    Polyamides containing arylene sulfone ether linkagesNCL Communication No. 4379 (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 583-594 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polyamides containing arylene sulfone ether linkages were synthesized from 4,4′-[sulfonylbis(p-phenyleneoxy)] dibenzoyl chloride (SPCI), 3,3′-[sulfonylbis(p-phenyleneoxy)] dibenzoyl chloride (SMCl), and arylene sulfone ether diamines (SED), by solution and interfacial polymerization techniques. In solution polymerization, the effect of various acid acceptors such as propylene oxide (PO), lithium chloride (LiCl)/lithium hydroxide (LiOH), and triethylamine (TEA) on molecular weight of the polyamides was studied. The effect of methyl substituted and unsubstituted aromatic sulfone ether diamines on molecular weight and thermal properties of polyamides was also studied. The polyamides prepared were characterized by solution viscosity, elemental analysis, thermal gravimetric analysis, differential scanning calorimetry, and x-ray diffraction. Physical and thermal properties of polyamides prepared from SPCl and SED were compared with the polyamides prepared from SMCl and SED.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080270218
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamics of polystyrene sulfonate ionomers in solution. A neutron spin-echo study (1986)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 24 (1986), S. 273-281 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1986.140240607
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  • 3
    Electronic Resource
    Electronic Resource
    Polyimides and polyamide-imides containing arylene sulfone ether linkagesNCL Communication No. 4465. (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 1023-1035 
    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: Polyimides and polyamide-imides containing arylene sulfone ether linkages were synthesized from 4,4′-bis(4-isocyanatophenoxy) diphenylsufone (SPI), 4,4′-bis(3-isocyanatophenoxy) diphenylsulfone (SMI), pyromellitic dianhydride (PMDA), 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA), and trimellitic anhydride (TMA) using one-step method. The diisocyanates SPI and SMI were synthesized from 4,4′-bis (4-carboxyphenoxy) diphenylsulfone (SPA) and 4,4′-bis(3-carboxyphenoxy) diphenylsulfone (SMA) by a Weinstock-modified curtius rearrangement method. All the polycondensation reactions were carried out in N-methyl-2-pyrrolidone (NMP) and the polymers obtained were characterized by infrared spectroscopy, solution viscosity, elemental analysis, thermogravimetric analysis, differential scanning calorimetry, and X-ray diffraction.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070400534
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  • 4
    Electronic Resource
    Electronic Resource
    Polyaramides containing arylene sulfone ether linkagesNCL Communication No. 4496. (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 38 (1989), S. 2057-2071 
    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: Polyamides containing arylene sulfone ether linkages were synthesized from 4,4′[sulfonybis (p-phenyleneoxy)] dibenzoyl chloride (SPCI), 3,3′-[sulfonylbis (p-phenyleneoxy)] dibenzoyl chloride (SMCl) and various aromatic diamines (ARD), by solution and interfacial polymerization techniques. In solution polymerization, the effect of various acid acceptors such as propylene oxide (PO), lithium hydroxide (LiOH) in the presence of lithium chloride (LiCl), and triethylamine (TEA) on teh molecular weight of the olyamides was studied. The effect of structure of studied. The effect of structur of various aromatic diamine sof molecular weight and thermal properties of polyamides was also studied. The polyamides prepared were characterized by solution viscosity, elemental analysis thermo-gravimetric analysis, differential scanning calorimetry, and x-ray diffraction. Physical and thermal properties of polyamides prepared from SPcl and Ard were compared with the polyamides prepared from SMCl and ARD.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070381108
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  • 5
    Electronic Resource
    Electronic Resource
    The rheological properties of molten mixtures of polyoxymethylene and copolyamide: Their fibrillation and microstructure (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 19 (1975), S. 1781-1798 
    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 rheological properties of molten mixtures of polyoxymethylene and copolyamide have been investigated by the methods of capillary viscometry over a wide range of shear stresses. It has been found that at relatively close values of the melt viscosity polyoxymethylene (POM) and copolyamide (CPA) form mixtures which differ markedly in viscosity and elastic properties from the original polymers. Depending on the magnitude of the shear stress, the viscosity of mixtures of definite composition may be either higher or lower than the viscosity of the components. Three- to tenfold swelling of the stream emerging from the capillary is observed for such mixtures, whereas at the same temperatures and stresses no swelling of the POM and CPA extrudates is practically observed. The data obtained are accounted for by the fact that the flow of mixtures through the capillary involves the formation of hundreds of thousands of ultrathin fibres of POM in the matrix of CPA, which are oriented along the flow axis.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1975.070190701
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  • 6
    Electronic Resource
    Electronic Resource
    Thiuram vulcanization of natural rubber in the presence of hydrofuramide and ethanolamines (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 24 (1979), S. 683-692 
    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: Influence of hydrofuramide and ethanolamines on efficient vulcanization (EV), semi-EV, and conventional sulfur vulcanization accelerated by tetramethyl thiuram disulfide is reported. In the case of thiuram vulcanization, the amines increase the cure rate but reduce the crosslink density. The interaction of tetramethyl thiuram disulfide with amines has been studied. The amines interact with thiuram disulfide (TMTD) giving rise to the formation of gaseous products. Thermogravimetric analysis shows weight loss of about 50% in case of TMTD-ethanolamine system and 25% in case of TMTD-hydrofuramide system. Gas chromatographic studies of the gaseous products indicate that it consists mainly of H2S. The other constituents in the gaseous product are CO2 and a thiol. A possible reaction based on these observations to account for decrease in crosslink density in thiuram vulcanization caused by amines is reported.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070240306
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  • 7
    Electronic Resource
    Electronic Resource
    Application of tertiary amines with reduced toxicity to the curing process of acrylic bone cements (1997)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 34 (1997), S. 129-136 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: 4-Dimethylaminobenzyl alcohol (DMOH) and 4-dimethyl-aminobenzyl methacrylate (DMMO) were used as the activators in the benzoyl peroxide initiated redox polymerization for the preparation of acrylic bone cement based on poly(methylmethacrylate) beads of different particle size. The residual monomer content of the cured cements was about 2 wt %, independent of the redox system used in the polymerization, indicating that the activating effect of the tertiary aromatic amines DMOH or DMMO was sufficient to reach a polymerization conversion similar to that obtained with the benzoyl peroxide (BPO) N,N-dimethyl-4-toluidine (DMT) system. The BPO/DMOH and BPO/DMMO redox systems provided exotherms of decreasing peak temperature and increasing setting time, and the cured materials presented higher average molecular weight and similar glass transition temperatures in comparison with those obtained when DMT was used as the activator. In addition, these activators are three times less toxic than the classical DMT. © 1997 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Attachment of prostheses to the musculo-skeletal system by tissue ingrowth and mechanical interlocking (1973)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 7 (1973), S. 1-23 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The concept of tissue ingrowth into porous biomaterials as a means of attaching prostheses to the musculo-skeletal system is reviewed. A compilation of the various ceramic materials studied in vivo to date along with the results of the studies is presented. Results of studies on kinetics of tissue ingrowth into porous biomaterials are summarized. A discussion of the parameters controlling the rate of tissue ingrowth into porous implants is presented.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820070303
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  • 9
    Electronic Resource
    Electronic Resource
    Isochoric and isobaric glass formation: Similarities and differences (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 35 (1997), S. 1561-1573 
    Details
    ISSN: 0887-6266
    Keywords: glass transition ; isobaric ; isochoric ; polymer ; poly(carbonate) ; PVT behavior ; free volume theory ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Pressure-volume-temperature (PVT) studies were performed on a glass-forming polymer, poly(carbonate) (PC), under both isobaric and isochoric (constant volume) conditions. An isochoric glass transition was observed and the formation points were found to be consistent with those obtained isobarically. Although the isobaric and isochoric responses were, as expected, the same in the rubbery state, the glassy state values were found to be different and dependent upon the glass formation history. The isobaric data exhibited larger changes in going from the rubber to the glass, hence a “stronger” glass transition, than did the isochoric data. Inserting the experimental values for the thermal expansion coefficient α and isothermal compressibility β, into appropriate thermodynamic relations, measures of the strength of each transition are defined. Strength estimates based on literature values of α and β are compared to the experimental measures of the isochoric and isobaric transitions. In addition, both the isobaric and isochoric PVT results were analyzed in terms of the Fox and Flory free volume theory which assumes that the glass transition is an iso-free volume state. While the isobaric results were consistent with the Fox and Flory theory, the isochoric results were not consistent with the idea of an iso-free volume glass transition. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 1561-1573, 1997
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    The conformation of the anticodon loop of yeast tRNAPhe in solution and on ribosomes (1978)
    New York : Wiley-Blackwell
    Biopolymers 17 (1978), S. 2909-2931 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Y-base of yeast tRNAPhe was replaced by the fluorophores 1-aminoanthracene or proflavine to yield derivatives which are active in all of the reactions of peptide elongation on reticulocyte ribosomes. The relatively long lifetime, higher quantum yield, and environmental sensitivity of 1-aminoanthracene make it a particulary useful adjunct to the Y-base in studying conformational changes in the anticodon region. The absorption and emission spectra of 1-aminoanthracene in tRNAPheAa in solutions in which it is active in peptide synthesis indicate that the probe is in a hydrophobic environment, apparently provided by stacking with the adjacent bases in the anticodon loop. The proflavine derivative, tRNAPhePf, was employed in iodide quenching, D2O enhancement, and fluorescence depolarization experiments. The results indicate that the fluorophore in partially but not completely protected from the solvent. Anisotropy studies indicate that in solutions approximating those which support peptide synthesis on ribosomes, the probes have significant but restricted flexibility within the anticodon loop. Considered with nmr data and Y-base fluorescence from crystals of tRNAPheY, the results indicate that the solution and crystal structures of tRNAPhe are very similar. In turn, fluorescene from modified tRNAPhe bound to ribosomes is similar to that observed in solution. It is of special significance for future experiments involving nonradiative energy transfer that these probles adjacent to the anticodon retain independent flexibility when bound to ribosomes with poly(U). The tRNAPhe itself appears to be held rigidly on the ribosomes. It is concluded that within the limits dictated by the position and sensitivity of the probes used in this study, the mechanism of tRNAPhe binding to ribosomes and the movement of tRNA and mRNA during the translocation steps of peptide synthesis can be interpreted in terms of the well-defined crystal structure of tRNAPhe.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1978.360171212
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