ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Polymer and Materials Science  (7)
Collection
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Some rheological properties of molten polytetrafluoroethylenePresented at the International Symposium on Macromolecular Chemistry, IUPAC, Toronto, Canada, September 1968. (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 14 (1970), S. 79-88 
    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: Measurements of melt viscosity on samples of polytetrafluoroethylene of different molecular weight were carried out at 360°C by means of tensile creep tests in the linear viscoelasticity range. The apparent activation energy for viscous flow in the range between 330° and 380°C was estimated to be 20 kcal/mole. A value of about 7,500 was also determined for the average molecular weight between entanglement points (Me), from the equilibrium compliance (De). Melt viscosity data were compared with zero strength time (ZST) values and a linear correlation was found on a bilogarithmic scale. The dependence of ZST on the applied stress and temperature was also studied and the results are discussed on the basis of Bueche's theory on the creep at rupture above the glass transition temperature.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1970.070140109
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Dynamic-mechanical study of the secondary transition of poly(vinyl chloride)Prod. No. 1652 (1967)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 2553-2566 
    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 crystallinity, thermal history, plasticization, copolymerization, and chemical modifications on the dynamic-mechanical properties of poly(vinyl chloride) has been studied by means of a free-oscillation torsional pendulum. It was found that the secondary dispersion maximum is not affected by free volume, crystallinity, or head-to-head microstructure, but is modified by post-chlorination, copolymerization, and plasticization. These results show that the molecular motions responsible for the PVC β peak are not influenced by local differences in the distribution of the Cl atoms along the chain, so that they seem to be largely of a cooperative type.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1967.070111215
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Dynamic-mechanical and tensile properties of poly(vinyl chloride). Influence of thermal history and crystallinityPaper presented at the IUPAC Conference on Relaxation Phenomena and Mechanical Properties of Polyvinylchloride, Strasbourg, March 5-6, 1970. (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 1839-1849 
    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 dynamic-mechanical properties as a function of temperature and the low- and high-speed tensile properties at 23°C have been determined on specimens of conventional suspension-polymerized PVC and of low-temperature-polymerized PVC roll milled and then compression molded at different temperatures. It has been found that the main transition α and the shear modulus above Tα depend on the thermal history and are strongly affected by crystallinity, whereas the dynamic-mechanical spectrum below Tα is not influenced by these parameters. Room-temperature tensile modulus and yield properties are very little affected by processing history and crystallinity. The elongation at break and the fracture energy, on the contrary, increase, at any fixed strain rate, for conventional PVC with milling temperature. The same trend has been found for low-temperature PVC, but the elongation at break-versus-temperature curve is shifted, as a whole, toward higher temperatures by approximately 50°C. Such results are discussed in terms of homogeneity of the specimens, which is controlled by the melting process of the crystallites. Stereoscanning electron micrographs of fracture surfaces appear to substantiate these conclusions.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1972.070160720
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Relationships between mechanical properties and relaxation processes in polymers. Nylon 6 (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 15 (1971), S. 2487-2512 
    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 dynamic-mechanical properties as a function of temperature and frequency were measured for five samples of polycaprolactam (nylon 6) containing different amounts of hydrosoluble products. Low- and high-speed tensile properties and Izod impact strength were determined between -190° and 100°C for the same samples by using autographic methods. The influence of the mechanical relaxation processes on moduli, yield strength σy, yield strain εy, tough-brittle transition temperature, elongation at break εR, and tensile and Izod fracture energies was investigated. It has been found that some mechanical properties, such as modulus and yield properties, can be directly related to specific relaxation phenomena, whereas as far as other properties, such as the ultimate properties, are concerned, the existing correlation can be concealed by the interference of purely mechanical phenomena which depend on the testing technique used, the testing conditions, and the previous history of the material.
    Additional Material: 27 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1971.070151015
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Properties of dilute solutions of poly(2-methyl-5-vinyl pyridine) (1966)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 97 (1966), S. 97-112 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Poly(2-methyl-5-vinylpyridin) wurde durch Blockpolymerisation hergestellt und nach der Elutionsmethode fraktioniert. Als Lösungsmittel-Fällungsmittelsystem wurde Cyclohexanon/n-Heptan benutzt. Die Fraktionen wurden viskosimetrisch analysiert; die Molekulargewichte wurden nach der Lichtstreuungsmethode bestimmt. Die folgende Viskositäts-Molekulargewichts-Beziehung gilt für den Molekulargewichtsbereich von etwa 6.104 bis 106 in Methyläthylketon als Lösungsmittel bei 25°C: [η]-M-Beziehungen sind auch für Methanol aufgestellt worden sowie für die drei Θ-Lösungsmittel n-Butylacetat bei 21,8°C, Methylisobutylketon bei 37,4°C und n-Amylacetat bei 48,2°C. Die FLORY-Konstante wurde aus Messungen im O-Zustand zu 83·10-3 cm3·g-1(g·mol-l)-l/2 bestimmt; sie ist im untersuchten Bereich temperatabhängig. Derselbe Wert wurde auch aus den Viskositäts- und Lichtstreuungs-Meßdaten nach der Methode von KURATA und STOCKBUYER erhalten. Die Ketted exibilität des Poly(2-methyl-5-viny1-pyridin) ist derjenigen von Polymeren mit ahnlicher Moleknlarstruktur vergleichbar, wie ä. B. Polystyrol, substituierte Polystyrole oder Poly(4-vinylpyridin). Die thermodynamischen Wechselwirkungs-Parameter Θ und Ψ wurden durch Viskosimetrie mit Lösungen in Methyläthylketon bestimmt. Die Abhängigkeit des zweiten Virialkoeffizienten vom Molekulargewicht in diesen Lösungen wurde mit theoretisch berechneten Werten verglichen.
    Notes: Poly(2-methyl-5-vinyl pyridine) was prepared by mass polymerization and elution fractionated. Cyclohexanone/n-heptane was used as solvent/nonsolvent pair. Fractions of various molecular weights were analyzed by viscosimetry and light scattering. The following intrinsic viscosity-molecular weight relation was obtained at 25°C. in methylethyl ketone by light scattering measurements on fractions with molecular weights ranging from ca. 6·104 to 106. [η]-M relations were also obtained in methanol and in three Θ-solvents, i.e. n-butyl acetate at 21.8°C., methylicobutyl ketone at 37.4°C., and n-amyl acetate at 48.2°C. The FLORY constant determined from the Θ-measurements was found to be constant with the temperature in the range considered. Its value is 83·10-3·cm3·g-1·(g.mole-1)-1/2. The same value was obtained by treating the viscosity and light scattering results in methylethyl ketone according to the KURATA and STOCKMAYER theory. The flexibility of the chains of poly(2-methyl-5-vinyl pyridine) was found to be similar to that of polymers of similar molecular structure such as polystyrene, substituted polystyrenes or poly(4-vinyl pyridine). The thermodynamic interaction parameters Θ and Ψ were determined in methylethyl ketone by viscosimetry. The experimental dependence of the second virial coefficient on molecular weight for the latter solvent was compared in detail with that calculated according to existing theoretical treatments.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1966.020970109
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Dynamic-mechanical and creep measurements: A comparison of approximate conversion methods (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 6 (1968), S. 119-121 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.110060205
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    A new high temperature thermoplastic material: Tetrafluoroethylene - ethylene copolymerPresented at the XXIII Congress of Pure and Applied Chemistry, July 25-30, 1971, Boston, Mass., U.S.A. (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 10 (1972), S. 153-156 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.110100214
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...