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Mechanical Properties of Polymers and Composites
14 Dec 1993-
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.
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01 Jan 2012
TL;DR: For the publisher's version, please access the DOI link below as discussed by the authors ; for the version de l’editeur, utilisez le lien DOI ci-dessous.
Abstract: This publication could be one of several versions: author’s original, accepted manuscript or the publisher’s version. / La version de cette publication peut etre l’une des suivantes : la version prepublication de l’auteur, la version acceptee du manuscrit ou la version de l’editeur. For the publisher’s version, please access the DOI link below./ Pour consulter la version de l’editeur, utilisez le lien DOI ci-dessous.
31 citations
01 Jan 1999
TL;DR: Particulate filled polypropylene (PP) is widely used in many fields of application and the major advantage of the introduction of fillers into PP is the higher stiffness of the composites, which is especially important in applications at higher temperatures.
Abstract: Particulate filled polypropylene (PP) is widely used in many fields of application. The major advantage of the introduction of fillers into PP is the higher stiffness of the composites, which is especially important in applications at higher temperatures. Increased stiffness is usually accompanied by decreased impact resistance, which is not always acceptable. The selection of an appropriate PP copolymer or the incorporation of additional elastomer may lead to the often desired simultaneous enhancement of stiffness and toughness. Incorporation of a filler into the polymer changes all properties at the same time, therefore an optimization of properties is required during development. The major benefits of modified PP are versatility and an exceptional price/volume/ performance ratio.
30 citations
TL;DR: In this paper, the difference in Rhodamine B (RhB) photodegradation mechanism of PVA/TiO2 and PVDF/O2 microfibrous webs was described and discussed.
Abstract: In this paper, hydrophilic PVA/TiO2 and hydrophobic PVDF/TiO2 microfibrous webs with varied TiO2 concentrations (0 %, 1 %, 3 %, 5 %, 10 %, and 20 %) were produced by the electrospinning technique. UV–vis spectrums were tested to demonstrate the photocatalytic properties of PVA/TiO2 and PVDF/TiO2 webs under visible light. Overall, PVDF/TiO2 exhibits higher Rhodamine B (RhB) decomposition efficiency than PVA/TiO2 samples. Specifically, RhB of around 50 % and 80 % were degraded by 13 d and 49 d for PVA/TiO2 samples with TiO2 of 10 %. RhB of around 50 % and 100 % were degraded at 3 h and 49 d for PVDF/TiO2 samples with TiO2 of 10 % and 20 %. Furthermore, the degradation rate for PVA/TiO2 and PVDF/TiO2 with TiO2 of 10 % is around 0.11 and 0.23. The difference in RhB photodegradation mechanism of PVA/TiO2 and PVDF/TiO2 webs was described and discussed in this paper. Hydrophobic PVDF/TiO2 was suspended in RhB liquid and ensured maximum contact between RhB pollutants and TiO2, whereas PVA/TiO2 completely dissolved in RhB liquid, which decreased the contact area and caused secondary pollution. In conclusion, hydrophobic PVDF/TiO2 webs with TiO2 of 10 % were suitable candidates for RhB photodegradation compared to PVA/ TiO2 webs.
30 citations
15 Jul 2008-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the viscoelastic behavior of PI/SiO2 nanocomposite thin films under constant and fatigue tensile loading was studied and the cyclic hardening and viscous dissipation of thin films during the fatigue process were experimentally investigated and analyzed by storage modulus, loss modulus and phase lag.
Abstract: In this paper, the viscoelastic behavior of PI/SiO2 nanocomposite thin films under constant and fatigue tensile loading was studied. The cyclic hardening and viscous dissipation of PI/SiO2 nanocomposite thin films during the fatigue process were experimentally investigated and analyzed by storage modulus, loss modulus and phase lag. The time-dependent deformation under constant and fatigue loading was simulated based on two viscoelastic models known as Burger model and Findley power law. Standard parameter analysis methodology was employed to interpret the structure–property relationship and deformation mechanisms of this kind of nanocomposites. In addition, the effects of nano-silica content, stress level and loading pattern (constant or fatigue loading) on the creep resistance of materials were discussed as well.
30 citations
15 Oct 2004-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the miscibility of polypropylene/polyisobutylene (PP/PIB) blends were estimated by various methods including model calculations, using melting and crystallization characteristics, glass transition temperature, and solvent uptake experiments.
Abstract: Polypropylene/polyisobutylene (PP/PIB) blends were prepared in the entire composition range in an internal mixer. The miscibility of the components was estimated by various methods including model calculations, using melting and crystallization characteristics, glass transition temperature, and solvent uptake experiments. The structure was characterized by microscopy, while the mechanical properties of the blends were studied by tensile tests. PP and PIB form heterogeneous two-phase blends in the entire range of composition, but dissolution of some PIB in the amorphous phase of PP is revealed by the composition dependence of various characteristics. The Flory-Huggins interaction parameters derived by the group contribution approach of Small, from the melting temperature of the PP phase, by dynamic mechanical (DMTA) analysis and solvent uptake experiments indicate partial miscibility of PP and PIB, which is further supported by the morphology of the blends, and the composition dependence of mechanical properties. The glass transition temperature of the elastomer phase decreases with increasing PP content because of the development of thermal stresses as a result of good adhesion and different thermal expansion of the two polymers.
30 citations