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  • Articles  (6)
  • Chemistry  (6)
  • 1980-1984  (6)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (4)
  • Technology  (2)
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  • Articles  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Concerning voids in polyimide (1984)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 24 (1984), S. 345-349 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Small angle X-ray scattering (SAXS) has been used to evaluate the size and concentration of voids in poly(N,N′-bis-(phenoxyphenyl)pyromellitimide), PMDA-ODA. Analysis of the angular dependence of the scattering indicates the presence of voids ranging from 50 to 150 Å in radius. Integrated SAXS demonstrated that the volume fraction of voids was 7 × 10-4. These results were supported by measurements of the attenuation factor as a function of the sample thickness.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760240508
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  • 2
    Electronic Resource
    Electronic Resource
    The flow of thermoplastic melts: Experimental and predicted (1984)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 24 (1984), S. 501-510 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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 flow of polypropylene, nylon 6,6, and 33-percent glass-fiber-filled nylon 6,6 into a tensile bar mold was investigated. Pressures needed to fill the cavity and runner system were measured as a function of fill time and melt temperature. The experimental results were compared to pressures predicted using the Moldflow flow-analysis programs. Correlation between experimental and predicted pressures was good provided that accurate input data to the computer programs were used. The choice of runner diameter in the approximation of the irregular shaped runner of this tensile bar mold was found to be important, since the runner length was approximately 40 percent of the total flow length. Material properties of particular importance were thermal conductivity, viscosity, and no-flow temperature (the temperature at which the resin will no longer flow). Viscosity/shear rate/temperature data are needed for the computer programs and two methods of obtaining the data were examined: an Instron capillary rheometer and a capillary nozzle on an injection-molding machine. Good agreement between the two methods was found for polypropylene over a shear rate range of 100 to 10,000 s-1. Only the injection-molding capillary nozzle could be used for the nylon- and glass-filled nylon due to the thermal degradation that occurred in the Instron rheometer.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760240709
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  • 3
    Electronic Resource
    Electronic Resource
    The peroxidase antiperoxidase staining of factor VIII-related antigen on cultured endothelial cells (1984)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 18 (1984), S. 561-566 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: To prevent the premature occlusion of vascular prostheses, endothelium is being cultured experimentally onto synthetic flow surfaces. A rapid method of identifying cultured endothelium on the prosthesis is valuable for determining the degree of fibroblast and smooth muscle cell contamination and to screen for endothelial cell transformation. Fluorescent Factor VIII related antigen (FVIII-RA) staining has been used to identify cultured endothelium, but results in excessive staining of the underlying prosthesis, loss of morphologic detail, and deterioration of the FVIII-RA antibody reaction with time. We have applied the peroxidase antiperoxidase (PAP) method of antigen staining to permit staining of FVIII-RA and thereby to permit a sensitive and specific identification of human or canine endothelium with a concurrent analysis of morphologic detail.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820180509
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  • 4
    Electronic Resource
    Electronic Resource
    Measurement of the activation time for platelet adhesion to foreign surfaces (1980)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 14 (1980), S. 417-426 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: An apparatus is described which permitted a perfusant (lactated Ringer's solution) to be passed through a porous sample in a pulsatile manner with a square wave pressure profile. The “on” time, “off” time, number of cycles and pressure amplitude were separately controllable. Using this apparatus and immersing the sample in stirred, heparinized, human blood, there was a certain “off” time below which platelet adhesion to the sample abruptly ceased. The values of this “off” time, termed the activation time ta for platelet adhesion were ∼0.5 sec for 0.2 μm pore size cellulose diacetate/nitrate (millipore filter) and ˜0.3 sec for 0.2 μm polycarbonate (nuclepore filter). After a single cycle with a 5 sec “off” time, adhered platelets on both these materials showed pseudopodia, varying degrees of spreading and membrane perforation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820140408
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  • 5
    Electronic Resource
    Electronic Resource
    Vinyl chloride-ethylene copolymers: The effect of modest ethylene concentrations on the physical properties of compounds (1982)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 4 (1982), S. 57-61 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Vinyl chloride-ethylene copolymers containing from 1.0 to 5.5 wt.% ethylene were synthesized and compounded with DOP plasticizer at levels of 0, 5, 10, 20, 30, and 40 parts per hundred parts of resin. Physical property tests indicated that, as an internal plasticizer, ethylene was 2 to 3 times more efficient than DOP in the range studied. An examination of room temperature modulus as well as brittleness also indicated that crystallinity was still apparent in all copolymers.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730040203
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  • 6
    Electronic Resource
    Electronic Resource
    Direct extrusion of polymer latex emulsions (1983)
    Hoboken, NJ : Wiley-Blackwell
    Advances in Polymer Technology 3 (1983), S. 41-49 
    Details
    ISSN: 0730-6679
    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
    Notes: The synthesis of many thermoplastic and elastomeric polymers can be accomplished by dispersing the monomer (or a blend of monomers) to be polymerized in water with the aid of various surfactants. The monomer is then polymerized by the introduction of a free radical catalyst to produce a latex of the polymer. Coagulation is the first step in isolating the polymer from the latex, and typically, many subsequent process steps are required to “finish” the polymer to the pelletized or expanded crumb from suitable for end users to convert the polymer into useful products.The process described herein combines all the process steps required to coagulate, separate and dewater, wash, devolatilize, homogenize and pump the polymer in a single-step, short residence time system. The machine employed for this process is a counter-rotating, tangentially opposed twin-screw extruder. One important variation of the basic process combines an integral plasticating extrusion step with the latex conversion to make polymer blends and alloys. Critical process parameters are identified and discussed and examples of pilot plant scale experimental data for ABS (acrylonitrile-butadiene-styrene terpolymer) systems are reviewed.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adv.1983.060030106
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