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  • Artikel  (516)
  • Polymer and Materials Science  (396)
  • Chemical Engineering  (98)
  • Physical Chemistry  (22)
  • 1985-1989  (365)
  • 1975-1979  (151)
  • 1986  (365)
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  • Artikel  (516)
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  • 1985-1989  (365)
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  • 1
    Digitale Medien
    Digitale Medien
    Short fiber-reinforced thermoplastic elastomers from blends of natural rubber and polyethylene (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 32 (1986), S. 5123-5146 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Thermoplastic elastomer blends of natural rubber (NR) with high density polyethylene (HDPE) and with low density polyethylene (LDPE) were reinforced with short silk fiber. Processing characteristics such as torque and temperature developed during mixing and the effect of processing parameters such as nip gap and number of passes in the mill necessary to secure maximum orientation of the fibers in the blends were studied. A small nip gap and a single pass in the mill were found to give best results. Of the different mixing sequences studied, the sequence where short fibers followed by rubber were added to the molten thermoplastic was found to give a uniform dispersion of fibers. Fiber breakage and the change in aspect ratio of the fibers after mixing were also examined. It was observed that, as a direct consequence of the mixing sequence, each fiber was coated with a layer of thermoplastic. Although the properties improved on the addition of the dry bonding system of silica-resorcinol-hexamethylenetetramine, the comparatively long curing time required for full development of adhesion between the fibers and the matrix proved to be a major disadvantage associated with the incorporation of the bonding system. The tensile and tear properties were substantially enhanced, but the ultimate elongation decreased sharply with increasing loading of short fibers in the blends. The effect of fiber orientation and the development of anisotropy in the properties was also noted. Scanning electron microscopy (SEM) studies of the benzene-extracted surfaces of the NR/HDPE (high density polyethylene) blends substantiated the theory of fibers behaving like “mechanical anchors” between the rubber and thermoplastic phase. The effect of fiber loading on the tear and tensile properties of the blends of NR/LDPE with varying blend ratios was studied. Most pronounced improvement in the properties on the addition of short fibers was observed in the high rubber blends. As the plastic content in the blends increased, the short fibers were found to have a lesser influence on the properties. SEM photomicrographs of the tensile and tear fracture surfaces indicated the fiber orientations and the effect of orientation, fiber loading, and blend ratios on the nature of fracture.
    Zusätzliches Material: 31 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1986.070320530
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  • 2
    Digitale Medien
    Digitale Medien
    Structural analysis of resin developed as an adhesive for poly(w-aminoundecanoic acid) (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 3573-3575 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1986.080241237
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  • 3
    Digitale Medien
    Digitale Medien
    Preparation and some properties of 2,2,6,6-tetrahydryl-F-heptanedioic acid and its polyester with 1,1,5,5-tetrahydryl-F-1,5-pentanediol (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 2033-2045 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 2,2,6,6,-Tetrahydryl-F-heptanedioic acid was prepared by hydrolysis of 1,7-diethoxy-2,6-dihydryl-F-1,6-heptadiene, which was obtained by a copper-induced coupling reaction between 1,3-di-iodo-F-propane and 1-ethoxy-1-fluoro-2-iodethylene. This olefin is obtained almost exclusively as the less thermodynamically stable isomer in the reaction between 1,1-difluoro-2-iodoethylene and soidum ethoxide. Synthesis of the acid via 2,2,6,6,-tetrahydryl-F-heptanedial was unsuccessful, since the latter readily underwent cyclopolymerization. The acid has pKa1 = 2.38 and pKa2 = 3.35, and slowly liberates fluoride ion in aqueous solution. The polyester obtained with 1,1,5,5,-tetrahydryl-F-1,5-pentanediol is highly crystalline with a mp of 79°C and a history-dependent Tg of 6 to 75°C. Polymer with a high amorphous content had a reproducible Tg of -35°C. The polyester has good solvent resistance to hydrocarbons, and comparable thermal stability to the corresponding polyester prepared from isophthalic acid.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1986.080240901
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  • 4
    Digitale Medien
    Digitale Medien
    Phase Transition of Nematic Polymers in Elongatioaal Flow (1986)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 24 (1986), S. 481-483 
    Details
    ISSN: 0887-6258
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1986.140240909
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  • 5
    Digitale Medien
    Digitale Medien
    Prediction of rate constants for combustion and pyrolysis reactions by bimolecular QRRK (1986)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 32 (1986), S. 1971-1979 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Bimolecular QRRK (Quantum Rice-Ramsperger-Kassel) analysis is a simple method for calculating rate constants of addition and recombination reactions, based on unimolecular quantum-RRK theory. Input parameters are readily derived, and rate constants and reaction branching can be predicted with remarkable accuracy. Such predictive power makes the method especially useful in developing mechanisms of elementary reactions. Furthermore, from the bimolecular QRRK equations, limiting forms of the rate constants in the limits of low and high pressure are developed. Addition/stabilization is pressure-dependent at low pressure but pressure-independent at high pressure, as is conventionally understood for simple decomposition, its reverse. In distinct contrast, addition with chemically activated decomposition has the opposite behavior: pressure independence at low pressure and pressure dependence [as (pressure)-1] at high pressure. The method is tested against data and illustrated by calculations for O + CO → CO2; for H + O2 → HO2 or O + OH; for H + C2H4 → C2H5 or C2H3 + H2; and for H + C2H3 → C2H4 or H2 + C2H2.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690321206
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  • 6
    Digitale Medien
    Digitale Medien
    Die Lochkorrosionsanfälligkeit des Vergütungsstahles X20Cr13 in Natriumchloridlösungen (1977)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 28 (1977), S. 809-816 
    Details
    ISSN: 0947-5117
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Pitting corrosion susceptibility of the heat treatable steel X20Cr13 in sodium chloride solutionsFor blades in steam trubines it is common to use the heat-treatable steels with 13% Cr (X20Cr13). Cracking of blades in the region of the turbine, where the steam starts to get wet, have often been referred to be caused by corrosion fatigue. The fatigue cracks sometimes start at inclusions in the material, but more often at pits caused by pitting corrosion. Pitting is brought about by chloride containing blade deposits. To examine the pitting behaviour of the steel in NaCl-solutions we measured the mixed-potential, the potentiostatic piting potential, the mass-loss and the pits per area as depending on temperature (20-80°C), pH (5-7-9), oxygen content (20 μg/kg up to saturation with oxygen) and chloride content (8×10-5 mole/l up to saturation with NaCl 5,4 mole/l). The results show that steel X20Cr13 suffers pitting corrosion because of it's low Cr content in all technical possible NaCl solutions down to a Cl content of 10-5 mole/l at the mixed potential.
    Notizen: Als schaufelwerkstoff für Dampfturbinen wendet man überwiegend Vergütungsstähle mit 13% Cr (X 20 Cr 13) an. Schaufelbrüche im Gebiet beginnender Dampfnässe der Turbine ließen sich häufig auf Schwingungsrißkorrosion zurückführe, die ihren Ausgang von Werkstoffinhomogenitäten, im allgemeinen jedoch von durch Lochkorrosion entstandenen löchern nahm. Ursache der Lochkorrosion sind festgestellte chloridhaltige Schaufelbeläge. Um das Lochkorrosionsverhalten dieses Stahles zu untersuchen, wurden in Natriumchlloridlösungen das Ruhe- und Lochkorrosionspotential, Massenverlust und Lochzahldichte und das Redoxpotential der Lösungen in Abhängigkeit von der temperatur (20-80°C), pH-Wert (5-7-9), Sauerstoffgehalt (20 μg/l bis sauerstoffgesättigt) und Chloridkonzentration (8 × 10-5 m/l bis 5,4 m/l (ges.)) bestimmt. Es ergab sich, daß der Stahl X20Cr13 wegen seiner nur gering ausgeprägten Passivität in praktisch allen technisch möglichen chloridhaltigen Elektrolyten bis hinab zu 10-5m/l Cl anfällig gegen Lochkorrosion ist.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/maco.19770281202
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  • 7
    Digitale Medien
    Digitale Medien
    Turbulence closure modeling of the dilute gas-particle axisymmetric jet (1986)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 32 (1986), S. 163-166 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690320121
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  • 8
    Digitale Medien
    Digitale Medien
    Drop breakup in turbulent stirred-tank contactors. Part I: Effect of dispersed-phase viscosity (1986)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 32 (1986), S. 657-666 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The extent to which dispersed-phase viscosity influences equilibrium mean drop size and drop size distribution at constant interfacial tension is determined for dilute suspensions by dispersing silicone oils of various viscosity grades in water. A mechanistic model for mean drop size is developed which predicts the moderate-viscosity data and whose parameters correlate the high-viscosity results. Trends in the mean size data coincide with those for the drop size distribution, which broadens considerably as viscosity increases and suggests a dependency on breakage mechanism.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690320416
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  • 9
    Digitale Medien
    Digitale Medien
    A dielectric study of secondary relaxations and the “memory effect” in two compatible polystyrene blends (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 1587-1595 
    Details
    ISSN: 0887-6266
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Dielectric permittivities and loss tangents of 10 and 30% poly(2,6-dimethyl-1,4-phenylene oxide) (PPO)-polystyrene (PS) blends and 10 and 25% poly(vinyl methyl ether) (PVME)-polystyrene blends have been measured from 80 to 360 K at 1 and 10 kHz. The PPO-PS blends have two secondary relaxations below Tg and the PVME-PS blends have three regions. All blends have a β process which appears near 290 K, is independent of PPO or PVME concentration, and is associated with the local modes of motions of PS chains. It is suggested that the β process of PS allows a dipolar reorientation of the PPO or PS chain segments by creating more favorable surroundings for the motions of the latter. The effect of physical aging in the PPO-PS blend is substantial but the “memory effect” is significantly less. This is due to the lower contribution to tanδ from the β process of the blend.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/polb.1986.090240715
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  • 10
    Digitale Medien
    Digitale Medien
    Impingement mixing and its effect on the microstructure of RIM polyurethanes (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 2359-2377 
    Details
    ISSN: 0887-6266
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The effect of impingement mixing on the microstructures developed during a reaction injection molding process in a thermoplastic urethane system was investigated. The polyurethane studied was a 4,4′-diphenylmethane diisocyanate/l,4-butane diol/poly(propyleneoxide) end-capped with poly(ethy1eneoxide) polyol system with a 5/4/1 molar ratio. Three different impingement mixing levels ranging from Re = 80 to Re = 210 were implemented by a laboratory RIM machine. The samples were characterized by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), optical microscopy, and transmission electron microscopy (TEM). Morphologies of hard-segment globules, hard-segment spherulites, and soft-segment rich matrix were observed. The multiple DSC endotherms were related to different crystalline structures. A higher level of mixing was found to increase the molecular weight and produce more paracrystalline structures. A lower mixing level produced better phase separation and spherulitic structures. High temperature annealing caused transurethanization, which may allow molecular rearrangement and change the crystalline structures.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/polb.1986.090241017
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