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  • Polymer and Materials Science  (6)
  • FABRICATION TECHNOLOGY  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The effect of elemental red phosphorus on the thermal degradation of poly(ethylene terephthalate) (1977)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 21 (1977), S. 1687-1697 
    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 influence of elemental red phosphorus on the rate of thermal degradation of poly(ethylene terephthalate) has been studied in the temperature range of 400° to 500°C in inert and oxidizing atmospheres by means of isothermal thermogravimetric analysis. Addition of red phosphorus is found to reduce the rates of both the pyrolytic and the thermo-oxidative degradation and to increase the amount of residual char. A correlation of pyrolysis rates with oxygen index data has been attempted.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1977.070210625
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Butt joint versus bevelled gold margin in metalceramic crowns (1980)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 14 (1980), S. 239-250 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The merits of a butt joint versus a bevelled margin are reexamined. It is shown that only acute bevels are effective in reducing the marginal diffusion of plaque acid. However, acute gold bevels may give rise to other major problems in avoiding distortion of the gold during firing of the porcelain, and finishing and cementing the crown.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820140306
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A study of the nature and formation of zinc polyacrylate cement using Fourier transform infrared spectroscopy (1988)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 22 (1988), S. 623-631 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The formation and structure of zinc polyacrylate has been studied by Fourier transform infrared spectroscopy (FTIR). Using this technique we have shown that the fully hardened cement is bonded predominantly by zinc carboxylate complexes, rather than by associations of purely ionic character as had previously been supposed. Ionic bonds are formed in the initial stages of the reaction but are gradually converted to complex forms. This bond rearrangement appears partly responsible for physical changes that occur during gelation, setting, and hardening.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820220704
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    NMR spectroscopy of dental materials. II. The role of tartaric acid in glass-ionomer cements (1982)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 16 (1982), S. 431-445 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: D(+) tartaric acid is incorporated into glass-ionomer cements to control the setting properties. 13C NMR spectroscopy of the fluid cement pastes have shown that tartaric acid reacts more readily than the polyacid with the glass, and hence suppresses the premature gelation of the cement. As the cements set, the pH rises from ca. 1.25 to ca. 3 when tartaric acid is fully complexed. As the polyacid reacts the pH rises further to ca. 5.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820160411
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  • 5
    Electronic Resource
    Electronic Resource
    Characterisation of Films Grown on Aluminium Immersed in Aerated Saline Solutions Containing Nickel (1996)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 24 (1996), S. 293-305 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Small additions of nickel chloride to salt solution significantly reduce the corrosion of aluminium alloys. Films produced in these solutions produce a microrough topography which may be suitable for adhesive bonding. Techniques such as XPS, SEM, FTIR and SIMS were used to investigate the properties of the films. The results established that nickel is incorporated in the outer layer of a hydrated aluminium oxide film and is responsible for altering the film growth mechanism. Boeing wedge tests were conducted to assess the relative durability of bonds with adherends pretreated in the salt solutions. The durability performance of the film as a surface treatment for adhesive bonding compared favourably with the Forest Products Laboratory chromate etch. A comparison of the nickel salt treatment with a sodium chloride solution treatment indicated that durability differences were related to their respective hydrated oxide structures.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 6
    Electronic Resource
    Electronic Resource
    Effect of Contaminant on the Durability of Epoxy Adhesive Bonds with Alclad 2024 Aluminium Alloy Adherends (1996)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 24 (1996), S. 569-577 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Surface preparation of aluminium alloy adherends is designed to minimize the influence of organic contaminant on the durability of epoxy adhesive bonds. The organic contaminant molecules have the potential to inhibit the bonding of the adhesive with the surface oxide on the adherend. X-ray photoelectron spectroscopy (XPS) shows that a freshly exposed aluminium surface quickly adsorbs over ten atomic layers of organic contaminant. Models to fit XPS data measured at various specimen take-off angles indicate that this contaminant is not adsorbed uniformly. Experiments show that for mechanically prepared adherends treated with an organosilane coupling agent, the bond durability depends strongly on the contaminant concentration and the time of administration during the preparation sequence. The observed variations in bond durability can be explained in terms of inhomogeneities in the strength of adhesion between the adhesive and the metal oxide.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 7
    facet.materialart.
    Unknown
    Snapring Quick Fastener (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Snapring fastener allows quick attachment and detachment of solar panels. Springy structure bent to fit any recess, making solar-panel removal or repair extremely simple.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-15724 , NASA Tech Briefs (ISSN 0145-319X); 8; 4; P. 569
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
    facet.materialart.
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    Supporting Structures for Flat Solar-Cell Arrays (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Strong supporting structures for flat solar photovoltaic arrays built with such commonly available materials as wood and galvanized steel sheet. Structures resist expected static loads from snow and ice as well as dynamic loads from winds and even Earthquake vibrations. Supporting structure uses inexpensive materials. Parts prefabricated to minimize assembly work in field.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-15600 , NASA Tech Briefs (ISSN 0145-319X); 9; 3; P. 163
    Format: text
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    NASA TECHNICAL REPORTS
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