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  • 1
    Electronic Resource
    Electronic Resource
    Phase Separation and Crystallization Phenomena in a Poly(ester-carbonate) Block Copolymer: A Real-Time Dielectric Spectroscopic and X-ray Scattering Study (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 4516-4524 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00117a021
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  • 2
    Electronic Resource
    Electronic Resource
    SANS and light scattering of nonylammonium chloride micelles in aqueous solutions of sodium chloride (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1515-1522 
    Details
    ISSN: 0392-6737
    Keywords: Colloids ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Aqueous solutions of nonylammonium chloride (NAC) containing sodium chloride were studied by using light scattering and small-angle neutron scattering (SANS) techniques. It was found that the aggregation number of NAC is independent of the surfactant concentration and increases smoothly with increasing the ionic strength. Micelles of NAC in D2O with [NaCl]=0.3422 have prolate ellipsoidal shape and their average aggregation number is greater than that found in H2O at the same ionic strength. A possible explanation of this difference may arise from a solvent effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462036
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular dynamics of vinylidenefluoride-trifluoroethylene copolymers
    Amsterdam : Elsevier
    Physica B: Physics of Condensed Matter 156-157 (1989), S. 423-425 
    Details
    ISSN: 0921-4526
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4526(89)90695-9
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  • 4
    Electronic Resource
    Electronic Resource
    Changes in defect concentration within polymer crystals: annealing of isotropic and drawn polyethylene (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 123-127 
    Details
    ISSN: 1435-1536
    Keywords: Polyethylene ; chain defects ; lattice constants ; annealing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An estimation of the changes in the level of chain defects (branches) accommodated within crystals of undrawn and drawn branched polyethylene, subsequently annealed, is carried out in the light of unit cell expansion data. The results reveal that annealing affects the estimated crystalline defect concentration differently depending on whether the material was drawn or undrawn. Thus, annealing of drawn polyethylene with a defect concentration of 3 % results in a healing of crystal defects, due to a preferential rejection of branches from the crystals. In contrast, annealing of melt crystallized branched polyethylene does not influence the average concentration of chain defects within the crystal despite the increase in lamellar thickness. The branches are trapped into the much wider lamellar crystals with fewer grain boundaries available and defect sequences cannot diffuse out of the crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414837
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  • 5
    Electronic Resource
    Electronic Resource
    Lamellar structure in melt crystallized low density polyethylene (1984)
    Springer
    Polymer bulletin 12 (1984), S. 269-274 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A combined X-ray diffraction and DSC investigation of the crystalline phase in lamellar low density polyethylene after conventional chlorosulfonation treatment has been carried out. Our results indicate that the acid attack does not involve any heavy group penetration within the lattice. The location of these groups at the basal crystal surface contributes, however, to an enhancement of the melting temperature of the modified lamellae. It turns out that the destruction level of crystalline material at 45°C, after 15–20 h is of the order of 20% and progressively increases for longer periods of time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275978
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of chlorosulfonation on the surface mechanical properties of lamellar polyethylene (1983)
    Springer
    Polymer bulletin 10 (1983), S. 553-557 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The hardening of lamellar polyethylene (PE) as a consequence of a controlled chlorosulfonation treatment has been studied using the microindentation technique. The hardness of the polymer turns out to be a linear function of the density of treated PE. The rate of increase is larger for samples with higher crystallinity. This increase is related to the hardening of crystal lamellae due to the surface attachment of electron dense groups. The latter impede the slippage of crystals and substantially reduce the rate of creep of the material under the contact pressure applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285375
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  • 7
    Electronic Resource
    Electronic Resource
    Comment of the influence of annealing on the distribution of chain defects in drawn polyethylene (1982)
    Springer
    Colloid & polymer science 260 (1982), S. 694-696 
    Details
    ISSN: 1435-1536
    Keywords: Drawn branched polyethylene ; annealing ; unit cell expansion ; crystalline defects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The present study suplements preceding investigations [1–5] concerning the distribution of chain-defects between crystalline regions and crystal surface, and extends them to the influence of annealing in case of drawn branched polyethylene (PE). For this purpose available unit cell data for annealed drawn PE withɛ=3%, at various annealing temperatures and times, are examined by assuming the penetration of chain defects at interstitial crystal sites by means of 2gl kink generation. The analysis of results shows that the initial level of ∼8×10−2 chain defects expanding the lattice decreases linearly as a function of annealing temperature. After annealing at 100 °C during 3×103 min this level decreases to values 〈 10−3. It is suggested that these space-filling point defects can be converted through chain diffusion in “amorphous” defects, “cooperative” defects and/or in defects segregated into the surface layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414655
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  • 8
    Electronic Resource
    Electronic Resource
    Properties of elongational flow injection moulded polyethylene (1989)
    Springer
    Journal of materials science 24 (1989), S. 2643-2652 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In Parts 1 and 2 of this series the influence of mould geometry and processing parameters was investigated for elongational flow injection moulded polyethylene with the aim of improving the mechanical properties. In the present study (Part 3) injection moulding of commercial polyethylene samples has been carried out using a wide range of molecular weights. Two moulds were used, one of them only providing shear flow, the other one allowing, in addition large elongational flow. In the case of the mould with large elongational flow, at a critical molecular weight, which depends on the melt temperature, a well defined transition in birefringence and mechanical properties of the injection mouldings has been detected. This transition has been discussed in terms of a development of a percolating network structure of long-lived stable knots yielding high mechanical strength oriented mouldings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01174539
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  • 9
    Electronic Resource
    Electronic Resource
    Temperature dependence of microhardness and structure of ferroelectric copolymers of vinylidene fluoride (1992)
    Springer
    Journal of materials science 27 (1992), S. 2124-2130 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Measurement of the microhardness (H) and X-ray investigation of melt-crystallized random copolymers of vinylidene fluoride with trifluorethylene containing 60 to 80 mol% VF2 were carried out as a function of temperature. The results show that (i) at a given temperatureH rapidly increases with VF2 content; (ii) the Curie transition was found to involve an inflection point in the exponential temperature dependence of hardness; and (iii) at the Curie temperature (T c) the ferroelectric crystals undergo reversibly a solid-state transformation, followed by the microhardness, to a non-polar (paraelectric) state showing a faster hardness decrease with increasing temperature aboveT c. Changes inH with VF2 content and temperature are discussed in the light of the lattice spacings of the ferro- and paraelectric phases and crystallinity values. The application of a relationship to account for correlations between mechanical properties and microstructure is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01117926
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  • 10
    Electronic Resource
    Electronic Resource
    DSC and X-ray Diffraction Study of Polymorphism in n-Alkylammonium Chlorides (2000)
    Springer
    Journal of thermal analysis and calorimetry 61 (2000), S. 341-350 
    Details
    ISSN: 1572-8943
    Keywords: DSC ; polymorphism ; X-ray
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The influence of the hydrocarbon chain length in the formation of interdigitated and non-interdigitated bilayers in n -alkylammonium chlorides has been investigated for chain lengths varying between 8 and 14 carbon atoms. The formation of non-interdigitated bilayers during crystallization from solution is favoured for shorter chains whilst the interdigitated structure is predominant for larger chains. The thermodynamic parameters of the solid to solid phase transitions in the non-interdigitated samples depend on chain length showing the odd-even alternation that characterized homologous series in n -paraffins. The solid to liquid crystal phase transition temperatures and enthalpies show a linear dependence with the chain length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010196829323
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