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  • Polymer and Materials Science  (232)
  • EARTH RESOURCES AND REMOTE SENSING  (160)
  • Humans  (85)
  • SOLAR PHYSICS  (83)
  • 1980-1984  (560)
  • 1984  (560)
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  • 1980-1984  (560)
Year
  • 11
    Electronic Resource
    Electronic Resource
    Macromolecular conformation studies by variable temperature 13C and 29SI-NMR magic angle spinning (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 7 (1984), S. 63-85 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 24 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.020071984105
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  • 12
    Electronic Resource
    Electronic Resource
    Antioxidant mechanisms of hindered amine light stabilizersHindered amine light stabilizers are frequently referred to simply as HALS.Issued as NRCC # 23446. (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 8 (1984), S. 79-88 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Secondary and tertiary hindered amines of the piperidyl type and many other piperidyl compounds can protect various polymers against oxidations initiated by light, heat and ionizing radiation. These amines stabilize by being converted to a series of products which can scavenge with high stoichiometry the main radicals responsible for the oxidative chain. This high stoichiometry results from the cyclical regeneration of the scavenging piperidyl species. The efficiency of the hindered amines as antioxidants in polyolefins is enhanced by their ability to associate with the unstable oxidized domains in which photo- and thermal oxidations will eventually reinitiate. Secondary amines can also slowly decompose intramolecularly hydrogen bonded hydroperoxide groups of the type found in polypropylene. This process may destroy the unstable oxidation product before the hydroperoxide can re-initiate oxidation and also generates another powerful antioxidant, a hydroxylamine. Despite the cyclical regeneration of active piperidyl radical scavengers, side reactions can produce non-scavenging products or even photo-initiators which will progressively accumulate and strangle the antioxidant activities.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.020081984107
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  • 13
    Electronic Resource
    Electronic Resource
    Investigations of water and high energy radiation interactions in an epoxy (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 311-318 
    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: Differential scanning calorimetry (DSC) and infrared spectroscopy (IR) have been used to study the crosslinked epoxy system tetraglycidyl-4,4′-diaminodiphenyl methane cured with diaminodiphenyl sulfone. Samples cured at various temperatures were soaked in distilled water for extended periods or irradiated with 0.5 Me V electrons and 60Co gamma. DSC results show that the standard-cured (137°C for 2 h and 160°C for 5 h) dry samples have a Tg around 190°C and a large exothermic reaction at about 260°C. The latter is attributed to further reaction of curing agent with the epoxide rings. The exothermic energy is about 124 cal/g for an uncured specimen, 42 cal/g for standard cured specimen, and 20 cal/g for soaked samples containing 4% H2O. The exothermic energy is shown to decrease monotonically with the ionizing radiation dosage. IR results show a reduction in the intensity of the epoxide band as the exothermic energy is decreased.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070290129
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  • 14
    Electronic Resource
    Electronic Resource
    Acrylic terpolymer-PVC blends with improved properties (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 3421-3430 
    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: Adhesive sealant compositions with improved properties and enhanced outdoor resistance were prepared by blending acrylic terpolymer (AT) with PVC. The morphology of these blends was studied by SEM, energy-dispersive X-ray analysis (EDXA), and DSC. The blends are heterogeneous. They consist of a continuous phase, which is either pure or mixed. AT, and a particulate phase having the morphology of the added component. The particulate phase of AT-PVC contains mixed AT. The AT-PVC blends have improved mechanical properties (e.g., ultimate tensile strength, adhesive strength, etc.). The improvement in mechanical properties is strong, probably because the added PVC has strong specific interaction capabilities with AT. Whereas the unblended AT has very low outdoor durability, the AT-PVC blends display enhanced resistance to weathering, as evidenced by substantially higher ultimate tensile strength of weathered specimens than those of the controls (unweathered).
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070291119
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  • 15
    Electronic Resource
    Electronic Resource
    Kinetic and thermogravimetric analysis of the thermal oxidative degradation of flame-retardant polyestersIssued as NRCC no. 22961. (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 911-923 
    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: Untreated and flame-retarded poly(ethylene terephthalate) fabrics have been subjected to thermogravimetric analysis in air at several heating rates between 0.1°C/min and 100°C/min. The data have been analyzed using a variety of methods to obtain kinetic parameters for the sequential stages in the thermal degradation process. The data obtained reveal that the phosphorous-only flame retardants do not significantly effect the degradation kinetics. The two bromine-containing flame retardants, however, are capable of modifying the degradation kinetics, with the Dacron 900F material being responsible for a beneficial condensed-phase effect while the TRIS-treated sample is responsible for reduced activation energies and more rapid weight loss.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070290319
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  • 16
    Electronic Resource
    Electronic Resource
    Polycarbonate blends with styrene/acrylonitrile copolymers (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 3131-3145 
    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: Lap shear adhesion between laminated sheets of polycarbonate and styrene/acrylonitrile copolymers exhibits a sharp maximum when the acrylonitrile content of the copolymers is in the range of 25-27% by weight. Observations of shifts in glass transitions of the two phases in melt-mixed polycarbonate/SAN blends suggest partial miscibility of one polymer in the other, and this solubility is at a maximum when the SAN copolymer has an acrylonitrile content in the same range causing maximum adhesion. Mechanical properties of injection-molded blends of polycarbonate with various SAN copolymers were also best when the acrylonitrile content was the same as that giving maximum adhesion. The partial miscibility behavior in blends as a function of acrylonitrile content of the copolymer is explained qualitatively in terms of a simple binary interaction model.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070291016
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  • 17
    Electronic Resource
    Electronic Resource
    Inelastic electron tunnelling spectroscopy of silane coupling agents (1984)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 6 (1984), S. 40-45 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Inelastic electron tunnelling (IET) spectra are reported and assigned for some trialkoxysilanes adsorbed on aluminium oxide. Spectra of the triethoxysilanes have many common features, and there is some evidence that these compounds are attached to the oxide surface by their ethoxy groups. There are differences in the trimethoxysilane spectra which may be due to a reaction at the oxide surface during junction preparation. In particular, IET spectra of 3-glycidoxypropyltrimethoxysilane show that the epoxide group reacts to produce groups.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740060107
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  • 18
    Electronic Resource
    Electronic Resource
    Analysis of polymer surfaces by SIMS. 4 - A study of some acrylic homo- and co-polymers (1984)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 6 (1984), S. 184-192 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Static SIMS spectra from essentially undamaged acrylic polymers have been obtained for total ions doses of 2 × 1012 ions cm-2. For a series of polymethacrylates the spectra can be interpreted in terms of a constant contribution from the polymer backbone plus dominant fragments from the ester side chain. Isomeric butyl methacrylate polymers can be distinguished. Negative ion spectra reflect the O:C atomic ratio of the bulk polymer. Positive ion relative intensities from ethyl methacrylate: hydroxyethyl methacrylate random copolymers correlate with polymer composition. Previous SIMS data from polymethacrylates have been shown to represent highly damaged surfaces.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740060407
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  • 19
    Electronic Resource
    Electronic Resource
    Solution properties of ion-containing polymers in polar solvents (1984)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 22 (1984), S. 1757-1773 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The placement of ionic groups within the molecular structure of a polymer produces marked modification in physical properties. A large number of studies have been performed on these ion-containing polymers, but few have focused on the effects of anion-cation interactions (i.e., counterion binding or ionization) on hydrodynamic volume, especially as the molecular structure of the solvent and nature of counterion are varied. In this study changes in hydrodynamic volume are followed through reduced viscosity measurements as a function of the abovementioned molecular parameters.The dilute solution properties of various polyelectrolytes that contain sulfonate and carboxylate groups were investigated as a function of the counterion structure, charge density, molecular weight, and solvent structure. The polymeric materials were selected because of their specific chemical structure and physical properties. In the first instance a (2-acrylamide-2 methylpropanesulfonic acid)-acrylamide-sodium vinyl sulfonate terpolymer was synthesized and subsequently neutralized with a series of bases. Viscometric measurements on these materials indicate that the nature of the cation affects the ability of the polyelectrolyte to expand its hydrodynamic volume at low polymer levels. The magnitude of the molecular expansion is shown to be due in part to the ability of the counterion to dissociate from the backbone chain, which, in turn, is directly related to the solvent structure. The changes in solution behaviour of these inomers lend support for the existence of ion pairs (i.e., site binding) and ionized moieties on the polymer chains. Measurements performed in a variety of solvent systems further confirm this interpretation. In addition, and acrylamide-sodium vinyl sulfonate copolymer was partially hydrolyzed with sodium hydroxide to study the effect of varying the charge density at a constant degree of polymerization and counterion structure. The results show that the charge density has a significant effect on the magnitude of the reduced viscosity and dilute solution behaviour. These observations, made in aqueous and nonaqueous solvents, are related to the interrelation of hydrodynamic volume, counterion concentration, and site binding. Again the controlling factor is the degree of site binding of the counterion onto the polymer backbone. Finally, we observe that the increased hydrodynamic volume affects viscosity behavior beyond the polyelectrolyte effect regime. If the average charge density on the macromolecule is relative high and/or the molecular weight is large (≥ 106) sufficient intermolecular interactions will occur to produce rapid changes in reduced viscosity.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1984.170220720
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  • 20
    Electronic Resource
    Electronic Resource
    The rheological behaviour of HDPE/LDPE blends. II. Die swell and normal stressesPart I: [1] (1984)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 71-73 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Strahlaufweitung wurde für verschiedene Mischungen aus Polyethylenen hoher und niedriger Dichte gemessen. Die an Proben mit eingefrorenen Spannungen erhaltenen Werte wurden in Abhängigkeit von technologischen Parametern (Länge/Durchmesser-Verhältnis, Fließgeschwindigkeit, Temperatur) dargestellt. An getemperten Proben gemessene Werte dienten zur Ermittlung der Normalspannungen durch ein theoretisches Näherungsverfahren.
    Notes: Die swell data are presented for different high-density/low-density polyethylene blends. The data relating to samples with frozen-in stresses are represented, collected as a function of the usual operational parameters (L/D ratio, flow rate, temperature). Data obtained with annealed samples are used to derive, through a theoretical approach, normal stresses.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1984.010350117
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