scispace - formally typeset
Search or ask a question
Book

Mechanical Properties of Polymers and Composites

TL;DR: In this article, the authors discuss various mechanical properties of fiber-filled composites, such as elastic moduli, creep and stress relaxation, and other mechanical properties such as stress-strain behavior and strength.
Abstract: Mechanical Tests and Polymer Transitions * Elastic Moduli * Creep and Stress Relaxation * Dynamical Mechanical Properties * Stress-Strain Behaviour and Strength * Other mechanical Properties * Particulate-Filled Polymers * Fiber- Filled Composites and Other Composites.
Citations
More filters
Journal ArticleDOI
Ying Liu1, Jiangwei Wang1, Li Liu1, Ying Li1, Fuhui Wang1 
TL;DR: In this paper, the failure mechanisms of an epoxy varnish coating and a glass flake coating were investigated under ordinary pressure (1) and high hydrostatic pressure (35) from electrochemical behavior, water absorption, wet adhesion and mechanical characteristics.

66 citations

Journal ArticleDOI
TL;DR: In this article, the authors defined brittleness of polymeric materials quantitatively with applications to multiple areas and found that the relationship between tribology and mechanics has been discovered and described.
Abstract: Brittleness is a significant property considered in product design and the research and development of materials. However, for a long time the methods to determine brittleness have been largely “hand-waving” arguments or else circumferential properties—in other words describing numerous properties related to brittleness but not actually quantifying brittleness itself. We have defined brittleness of polymeric materials quantitatively with applications to multiple areas. Relationships between brittleness and both tribology and mechanics have been discovered and are described. Moreover, the definition has been applied in the development of multilayer composite materials; structural integrity of the composites decreases with increasing brittleness. Other applications and the fact that toughness is not an inverse of brittleness are also discussed.

66 citations


Cites background from "Mechanical Properties of Polymers a..."

  • ...Still other quantities in use; Nielsen and Landel [29] say that ‘‘the concept of toughness can be defined in several ways, one of which is in terms of the area under a stress–strain curve’’....

    [...]

Journal ArticleDOI
TL;DR: In this article, a single or double coat of corn-zein was used to thermally laminate soy protein films, and the results revealed a ductile protein matrix of the soy component, but a brittle layered structure for the corn-ZEin component.
Abstract: Soy protein films were thermally laminated with either single or double coats of corn-zein. Microstructural characterization of the surfaces and cross-sections reveals a ductile protein matrix of the soy component, but a brittle layered structure for the corn-zein component. The hydrophobic nature of the corn-zein improved the water vapor barrier properties of the laminates, while the superior oxygen barrier characteristics remained unaffected, as compared with the base soy film. The haze values of the laminates increased without much change in total light transmission. Tensile properties supported observations from microscopy, in that tensile properties indicated ductile behavior of the soy films, but a brittle behavior for the double-coat laminates.

66 citations

Journal ArticleDOI
TL;DR: In this paper, the authors found that the reduction of the mixing torque after passing the peak maximum at the dynamic crosslinking stage was due to the shear induced breaking down of agglomerates leading to a more defined morphology.
Abstract: Formation of agglomerate structure by the rubber particles through flocculation or networking mechanism during dynamic crosslinking of thermoplastic elastomers based on EPDM rubber and polypropylene has been evidenced. Scanning electron microscopy (SEM) examination performed on the crosslinked blend samples which had been etched by hot xylene suggested that agglomeration occurs mainly through a joint shell mechanism. Reduction of the mixing torque after passing the peak maximum at the dynamic crosslinking stage was concluded to be due to the shear induced breaking down of agglomerates leading to a more defined morphology. Samples removed after the maximum mixing torque showed higher dynamic loss tangent (tan δ) above the PP glass transition. This is attributed to the broadening of the retardation time spectra for the PP matrix in the blend system. Higher mixing torque, higher tensile strength, as well as better extensibility were found for the blend samples based on PP with low MFI value as a res...

65 citations

Journal ArticleDOI
TL;DR: In this article, the effect of triblock copolymer poly(styrene-b-butadiene-bstyrene) (SBS) on the morphology and mechanical properties of immiscible polypropylene/polystyrene (PP/PS) blends were studied.
Abstract: The compatibilizing effect of the triblock copolymer poly(styrene-b-butadiene-b-styrene) (SBS) on the morphology and mechanical properties of immiscible polypropylene/polystyrene (PP/PS) blends were studied. Blends with three different weight ratios of PP and PS were prepared and three different concentrations of SBS were used for investigations of its compatibilizing effects. Scanning electron microscopy (SEM) showed that SBS reduced the diameter of the PS-dispersed particles as well as improved the adhesion between the matrix and the dispersed phase. Transmission electron microscopy (TEM) revealed that in the PP matrix dispersed particles were complex “honeycomblike” aggregates of PS particles enveloped and joined together with the SBS compatibilizer. Wide-angle X-ray diffraction (WAXD) analysis showed that the degree of crystallinity of PP/PS/SBS slightly exceeded the values given by the addition rule. At the same time, addition of SBS to pure PP and to PP/PS blends changed the orientation parameters A110 and C significantly, indicating an obvious SBS influence on the crystallization process in the PP matrix. SBS interactions with PP and PS influenced the mechanical properties of the compatibilized PP/PS/SBS blends. Addition of SBS decreased the yield stress and the Young's modulus and improved the elongation at yield as well as the notched impact strength in comparison to the binary PP/PS blends. Some theoretical models for the determination of the Young's modulus of binary PP/PS blends were used for comparison with the experimental results. The experimental line was closest to the series model line. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 69: 2625–2639, 1998

65 citations