Library

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
  • 1
    Electronic Resource
    Electronic Resource
    A comparative evaluation of the enhancement of stiffness of polypropylene by uniaxial drawing and by incorporating short glass fibres (1988)
    Springer
    Journal of materials science 7 (1988), S. 1339-1341 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00719977
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    An electron microscopic study of the morphology of cured epoxy resin (1985)
    Springer
    Journal of materials science 20 (1985), S. 3439-3452 
    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 An electron microscropic study of fracture surfaces and microtomed sections of a cured epoxy resin based on a difunctional bisphenol A type resin cured with different amounts ofm-phenylenediamine is presented. Heterogeneities in the range 5 to 100 nm are seen to be present and have relatively higher crosslink density compared to the surrounding matrix. It is observed that the fracture path is around the heterogeneity and not through it. The size of the heterogeneity is a function of curing agent concentration and also of cure cycle. The stoichiometric sample, which has the highest crosslink density and the highest glass transition temperature, has the smallest heterogeneities. On either side of stoichiometry, the heterogeneity size increases. Samples subjected to a more severe post-curing cycle have much larger heterogeneities. The possible physical basis for these differences is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01113751
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Thermally stimulated current characteristics of polypropylene with an without glass fibres (1982)
    Springer
    Polymer bulletin 7 (1982), S. 103-106 
    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 Small discs of melt-pressed polypropylene (PP), drawn polypropylene sheet (natural draw ratio 5.5) and short glass fibre-reinforeed polypropylene sheet were polarized in a d.e. field at 100°C for 1 hr. Thermally stimulated depolarization current (TSC) characteristics of the polarized discs were studied from 50 to 170°C. The isotropic sample shows two peaks around 75 and 110°C and these peaks shift to 100 and 140°C respectively for the drawn sample. The TSC peaks of glass fibre-reinforced PP sheet are close to those of the isotropic sample but the current emitted is much higher even though it was polarized at a lower field. It is proposed that the large interface areas between the glass fibres and polypropylene matrix can accumulate charge and lead to the observed enhancement of the depolarization current.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265459
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The elastic moduli of anisotropic polymers having a lamellar texture (1973)
    Springer
    Colloid & polymer science 251 (1973), S. 117-122 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Es wird ein Modell für ein teilkristallines Polymeres mit definierter lamellarer Textur betrachtet, bei dem die Orientierung der Lamellenebenen, wie sie sich aus Kleinwinkelröntgenstreuung ergibt, berücksichtigt wird. Die Moduln längs der kristallographischen Achsena, b, c werden auf der Basis eines interlamellaren Scherungsmechanismus für ein Polymeres von 60% Kristallinität (Niederdruckpolyäthylen) berechnet und mit den experimentellen Werten verglichen. Die Übereinstimmung scheint vernünftig.
    Notes: Summary A model for a semi-crystalline polymer having a welldefined lamellar texture is considered in which the orientation of the lamellar planes, as deduced from lowangle X-ray diffraction studies, is taken into account. The moduli along the crystallographica-,b- andc-axis are calculated on the basis of interlamellar shear mechanism for a 60% crystalline polymer (LDPE) and compared with the experimental values. The broad agreement is shown to be reasonable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01498935
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Orientation-dependence of the Young's modulus of high-density polyethylene filaments (1974)
    Springer
    Colloid & polymer science 252 (1974), S. 288-293 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung DerYoungs-Modul von HDPE-Fäden, kaltgestreckt in verschiedenem Ausmaß, wurde bestimmt. Die Orientierungsverteilung der Kristallite und der Moleküle in den amorphen Bereichen wurden quantitativ bestimmt. Unter Voraussetzung eines Einphasen-Modelles für die Berechnung derYoung-Modulen wird gezeigt, daß der Modul primär mit der mittleren Orientierung der Moleküle in den amorphen Bezirken gekoppelt ist.
    Notes: Summary TheYoungs modulus of HDPE filaments cold-drawn to different extents has been determined. The orientation distribution of the crystallites, of the total molecules and of the amorphous regions have been quantitatively determined. Using a simple one-phase model to predict theYoungs moduli, it is shown that the modulus is related primarily to the average orientation of the molecules in the amorphous regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01551149
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Anfärbbarkeits-Charakteristik texturierter Polyäthylenterephthalat-Garne (1977)
    Springer
    Colloid & polymer science 255 (1977), S. 704-704 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01550073
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    The effect of fibre orientation on the interfacial shear stress in short fibre-reinforced polypropylene (1987)
    Springer
    Journal of materials science 22 (1987), S. 1949-1955 
    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 Two methods for the determination of interfacial shear stress and the orientation effects in well aligned short fibre-reinforced polypropylene specimens subjected to uniaxial tension have been discussed. Both methods are based on the stress-transfer model due to Kelly and Tyson, but the orientation effects are taken into account by different procedures. In the first procedure the stress and strain along the load axis are considered and the orientation factor is found to be close to cos4θ for θ ⩽ 45°. In the second procedure the fibre orientation is taken into account by resolving stress and strain in the fibre axis direction. The transverse strain is also considered with the help of experimentally determined values of Poisson's ratio. The second procedure was found to be very satisfactory and it also confirms the assumption of linear dependence of interfacial stress on the tensile stress in the fibre direction, as postulated in an earlier study, for all orientations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01132922
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    The strength of the fibre-polymer interface in short glass fibre-reinforced polypropylene (1982)
    Springer
    Journal of materials science 17 (1982), S. 3179-3188 
    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 A method for the determination of the interfacial bond strength in well-aligned short glass fibre-reinforced polypropylene samples is discussed. The method takes into account the variation of the interfacial shear stress during the deformation process; consequently, it yields very consistent results at all values of the composite strain. The influence of the fibre orientation with respect to the load axis is appropriately considered using macro-mechanical analyses for stiffness and strength of the composite. The method is compared with two other methods reported in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01203481
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Some studies on glass fiber-reinforced polypropylene. Part I: Reduction in fiber length during processing (1989)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 10 (1989), S. 8-15 
    Details
    ISSN: 0272-8397
    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
    Notes: The reduction in fiber length during extrusion and injection molding of two commercial glass fiber-reinforced polypropylene products containing 30 percent by weight of glass fibers was studied. The first product had very small fibers of average length around 0.5 mm and also contained a coupling agent. The second product contained relatively longer glass fibers of 9 mm length and no coupling agent. In both cases, fiber attrition occurs predominantly at the solid-melt interface in the meiting zone of the extruder. However, in the short fiber granules, the maximum of the length distribution, which for the initial sample is around 0.5 mm, moved to shorter fiber lengths along the screw channels further from the hopper. In the long fiber granules, a bimodal length distribution was obtained in the intermediate channels; the first maximum was around the original length of 9 mm and the second centered around 0.5 mm. Thus, the forces at the solid-melt interface result in fiber breakage to lengths which are predominantly around 0.5 mm. The fiber attrition was observed to be more severe in injection molding apparently because of higher shear rates and also because the fibers had to pass through narrow channels. The measured distributions of fiber length along the screw channels for the two products are presented, and the possible mechanisms of fiber breakage are discussed. The mechanical properties of samples containing different fiber length distributions and the effects of fiber length and interfacial adhesion on properties are presented and discussed in Part II.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750100103
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Some studies on glass fiber-reinforced polypropylene. Part II: Mechanical properties and their dependence on fiber length, interfacial adhesion, and fiber dispersion (1989)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 10 (1989), S. 16-27 
    Details
    ISSN: 0272-8397
    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
    Notes: Two commercial grades of glass fiber-reinforced polypropylene granules, one containing short fibers of average length around 0.5 mm with a coupling agent and the other containing relatively much longer fibers mostly around 9 mm, but no coupling agent, were injection-molded into dumbbells and tested in tension between -43 and 90°C. There is considerable fiber attrition during injection molding; the fiber lengths are reduced to average values of 0.4 to 0.8 mm for thses two samples. Also during injection molding of the test sample, partial molecular alignment of the matrix (polypropylene) occurs which supplements the reinforcement of the matrix due to the aligned glass fibers (30 percent by weight) present in the composite sample. The stiffness and strength of these samples do not reflect the effects of fiber lengths since most of the fibers are of very small length in the molded specimen and also since the sample with longer fibers has a non-uniform distribution of fibers. While the interfacial shear strength does not appear to play a significant role in determining stiffness, it turns out to be extremely important in controlling strength, particularly at the higher test temperatures. The room temperature impact strength is high for the sample containing relatively longer fibers of average length around 0.8 mm in which fiber dispersion is non-uniform and fiber agglomerates are present. Acoustic emission data shows that debonding and fiber pull-out are the main contributors to sample toughness; this observation is supported by scanning electron micrographs of the fracture surfaces.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750100104
    Library Location Call Number Volume/Issue/Year 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...