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  • Polymer and Materials Science  (338)
  • General Chemistry  (37)
  • 1
    Electronic Resource
    Electronic Resource
    In vitro biocompatibility, mechanical properties, and corrosion resistance of Ti—Zr—Nb—Ta—Pd and Ti—Sn—Nb—Ta—Pd alloys (1995)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 29 (1995), S. 893-899 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: There is much discussion about the toxic effect of vanadium and aluminum contained in Ti—6Al—4V alloy for prosthetic implants. The goal of the present investigation was to develop new titanium alloys with sufficient mechanical properties using more biocompatible alloying elements: zirconium, tin, niobium, tantalum, and palladium. The relative growth rates of L929 and MC3T3-E1 cells were significantly higher when cultured with the extraction of Ti—10Zr—8Nb—2Ta—0.2Pd or Ti—15Zr—4Nb—2Ta—0.2Pd alloys than when cultured with the extraction of Ti—6Al—4V ELI alloy. The tensile strength, elongation, and reduction of area for Ti—15Sn—4Nb—2Ta—0.2Pd alloy were 989 MPa, 14.4%, and 49.3%, respectively, surpassing Ti—6Al—4V ELI alloy (ASTM F138—84); those for Ti—15Zr—4Nb—2Ta—0.2Pd alloy were 725 MPa, 23.6% and 54.9%, respectively. More than 15% addition of tin as well as zirconium deteriorated the tensile properties. Titanium release into a 5% hydrochloric acid solution from the new titanium alloys was 20-50 μg/cm2 per day, though that from Ti—6Al—4V ELI alloy was 1300 μg/cm2 per day. The optimum alloy compositions are Ti—15Zr—4Nb—2Ta—0.2Pd and Ti—15Sn—4Nb—2Ta—0.2Pd, judging from cytocompatibility, corrosion resistance, and mechanical properties. The former is characterized by its high level cytocompatibility and corrosion resistance, while the latter is characterized by mechanical properties. © 1995 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820290715
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  • 2
    Electronic Resource
    Electronic Resource
    Computer-Aided Materials Design for semiconductors (1993)
    Weinheim : Wiley-Blackwell
    Advanced Materials 5 (1993), S. 198-206 
    Details
    ISSN: 0935-9648
    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: Computer-aided materials design for semiconductors is reviewed. Reliable predictions are possible for a wide range of problems, such as the behavior of various heterovalent atomic species in III-V semiconductors, including C (conduction type), Si (DX-center), Ge (GaAs/Ge superlattices), S, Se and Te (passivation of GaAs surfaces), by using such computer-aided calculation techniques as pseudopotential methods.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19930050308
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  • 3
    Electronic Resource
    Electronic Resource
    Third-order nonlinear optical properties of thin films of organogermane homopolymers and organogermane-organosilane copolymers*This work was partly supported by the Ministry of Education, Science and Culture (Grant-in-Aid for Scientific Research on Priority Area of Reactive Organometallics). (1995)
    Weinheim : Wiley-Blackwell
    Advanced Materials 7 (1995), S. 917-919 
    Details
    ISSN: 0935-9648
    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
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19950071110
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  • 4
    Electronic Resource
    Electronic Resource
    Measurement of the flow of thermosetting molding compoundResearches on the flow of polymeric substances by means of extrusion rheometer: 4th report. (1959)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 2 (1959), S. 322-327 
    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 extrusion rheometer, suggested by the author, is used for the relative measurement of the flow of thermosetting molding compounds in a curing process which is more complicated and difficult to measure than that of thermoplastics. Allyl polyester molding compound, which contains asbestos as a filler in the amount of 50% and Luperco ATC as a catalyzer in the amount of 4%, is used as a test sample of the thermosetting compound. Because the unsaturated polyester which is used as a resin in the test sample of the thermosetting compound contains diallyl phthalate monomer, which acts as a crosslinking component in the radical polymerization reaction, there is no volatile by-product in the curing reaction. Therefore, breathing during the molding of this test sample is not needed, and this allyl polyester molding compound is considered to be most suitable to use as the test sample of the thermosetting molding compound. Several factors which exert an influence on the flow of the thermosetting compound in the curing process are investigated, and recommended testing conditions are determined. Although the flow curve of the thermosetting molding compound in the extrusion rheometer is not as simple as that of thermoplastics, the flow characteristics of the thermosetting molding compound can be evaluated and compared by the factors Rf, vf, fts, and fte, which are obtained from the flow curve. As an example, the influences of time-aging effect and various fillers on the flow of the thermosetting molding compound are examined by the above method.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1959.070020611
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  • 5
    Electronic Resource
    Electronic Resource
    Ordering and organization in ionic solutions and emulsionsPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “Polymers and Biological Functions” in Bad Nauheim (W. Germany) on April 18/19 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 111-130 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Recent studies on ionic distribution in solutions and in suspensions were reviewed. Suspensions of latex particles, which were large enough to be seen under an ultramicroscope, were investigated by the 2-D Fourier transformation. The micrograph showing ordered structures gave discrete scattering spots, whereas those of disordered arrangements displayed no spots or halos. The two-state structure gave a limited number of halo, confirming our previous conclusion that the very frequently observed single, broad scattering peak was reminiscent of some kind of ordering of solute species. By using an image data analyser, the crystallization process was shown to follow the Ostwald ripening mechanism. The concurrent study by the quasi elastic light scattering method and by the Fourier analysis gave consistent scattering profiles, which indicated that the ordering phenomena took place in the entire volume of suspensions. The scattering intensity (correctly the lattice factor) was calculated for cubic systems with paracrystalline distortion. The peak intensity was lowered by enhanced distortion, while the peak position itself was not affected. This justifies our previous treatment of the single, broad peak in terms of the Bragg equation. The experimentally found scattering curve was compared with this theoretical calculation; the degree of distortion was evaluated.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051660108
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  • 6
    Electronic Resource
    Electronic Resource
    I. Polymerization of vinyl monomers in the presence of inorganic substances (1973)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 32 (1973), S. 177-180 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1973.050320115
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  • 7
    Electronic Resource
    Electronic Resource
    The application of ultrasonic waves to the electrochemical polymerization of thiophene (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 19-24 
    Details
    ISSN: 0887-6266
    Keywords: ultrasonic waves ; electrochemical polymerization ; polythiophene ; potential ; current density ; Tafel plot ; conductivity ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The electrochemical polymerization of thiophene was carried out both in the presence and absence of ultrasonic waves. Without irradiation, the anode potential increased with increasing current density. Polymerization at high potential gave a low polymer yield and produced macroscopically heterogeneous films. Ultrasonic irradiation resulted in an improvement of polymer yield and in a lowering of the anode potential during polymerization. The effects were especially marked when the polymerizations were carried out at low temperature, low monomer concentration, and high current density. These results are explained by the formation of diffusion layer in the vicinity of the electrode during electrochemical reactions.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1992.090300103
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  • 8
    Electronic Resource
    Electronic Resource
    FTIR spectroscopic study on crystallization process of poly(ethylene-2,6-naphthalate) (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 35 (1997), S. 2741-2747 
    Details
    ISSN: 0887-6266
    Keywords: FTIR spectroscopy ; poly(ethylene-2,6-naphthalate) ; crystallization process ; induction period ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In situ Fourier transform infrared (FTIR) measurements were carried out to elucidate conformation changes occurring during the isothermal melt crystallization of poly(ethylene-2,6-naphthalate) (PEN). Based on the band assignments for the components of the amorphous, α-crystal form, and β-crystal form of PEN in film samples, the in situ data was analyzed in terms of the amorphous- and crystal-trans conformations. It was observed at a higher isothermal crystallization temperature that the formation of amorphous-trans conformations precedes the growth of crystals. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 2741-2747, 1997
    Additional Material: 7 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    In situ FTIR spectroscopic study on crystallization process of isotactic polystyrene (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 1227-1233 
    Details
    ISSN: 0887-6266
    Keywords: FTIR spectroscopy ; isotactic polystyrene ; crystallization process ; induction period ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The melt crystallization process of isotactic polystyrene (i-PS) was studied by means of in situ Fourier transform infrared (FTIR) spectroscopy, with a focus on the conformational changes during the induction period. The spectra obtained during the induction period suggested the occurrence of some ordered structure that is characterized by higher regularity and packing of the helical moieties than observed in the melt. This ordered structure was clearly different from the amorphous structure, and close to the crystal structure. The Avrami analysis indicated that the formation process of the ordered structure at the late stage of the induction period is similar to the growth process of the crystallites after the induction period. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 1227-1233, 1998
    Additional Material: 10 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Photochromic molecular recognition of γ-cyclodextrin bearing a spiro[2H-benzopyran-2,2′-indoline] moiety (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 15 (1994), S. 531-536 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1994.030150613
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