Mineral-Filled Polymer Composites

The structure of the interlayer between matrix and inclusions affect directly the mechanical and physical properties of inorganic particulate-filled polymer composites. The interlayer thickness is an important parameter for characterization of the interfacial structure. The effects of the interlayer between the filler particles and matrix on the mechanical properties of polymer composites were analyzed in this article. On the basis of a simplified model of interlayer, an expression for estimating the interlayer thickness ([Formula: see text]) was proposed. In addition, the relationship between the [Formula: see text] and the particle size and its concentration was discussed. The results showed that the calculations of the [Formula: see text] and thickness/particle diameter ratio ([Formula: see text]) increased nonlinearly with an increase of the volume fraction of the inclusions. Moreover, the predictions of [Formula: see text] and the relevant data reported in literature were compared, and good agreement was found between them.

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Calculation on the Residual Stresses of Injection-Molded Conductive-Carbon-Fiber-Filled Polymer Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.629.55 ◽

2012 ◽

Vol 629 ◽

pp. 55-59

Author(s):

Ai Yun Jiang ◽

Jing Chao Zou ◽

Bao Feng Zhang ◽

Hai Hong Wu

Keyword(s):

Carbon Fiber ◽

Residual Stresses ◽

Polymer Composites ◽

Injection Molding Process ◽

Molding Process ◽

Filled Polymer ◽

The Core ◽

Packing Pressure ◽

Core Areas ◽

Injection Molded

For conductive-carbon-fiber-filled polymer composites, the residual stresses developed during injection molding process may affect not only the molding’s conductive property, but its dimensional stability as well. In order to improve the conductivity of the molding fabricated with this kind of composites, we investigated, using layer removal method, the distribution of the residual stresses of injection-molded conductive-carbon-fiber-filled polypropylene in this paper. The residual stresses were obtained under the actions of different processing conditions. Our results indicate that processing pressures have more significant effects on the residual stresses at the skin areas than the core areas of the sample because of fiber orientation. The tensile stresses of the molding at the core areas drop under the action of packing pressure, but the compressive stresses at the skin areas increase. The results reveal that the action of packing pressure may decrease the anisotropy of the residual stresses in the molding.

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Nanomechanical and Nanotribological Properties of Nano- and Micro-Particle Filled Polymer Composites Used for Dental Restorative Applications

ASME/STLE 2007 International Joint Tribology Conference, Parts A and B ◽

10.1115/ijtc2007-44182 ◽

2007 ◽

Author(s):

D. Devaprakasam ◽

P. V. Hatton ◽

G. Moebus ◽

B. J. Inkson

Keyword(s):

Polymer Composites ◽

Filled Polymer ◽

Shape Distribution ◽

Micro Particles ◽

Reinforced Polymer ◽

Urethane Dimethacrylate ◽

Microscopy Techniques ◽

Dental Restorative ◽

Friction And Wear Characteristics ◽

Better Than

The objective of this work is to quantify nanomechanical and nanotribological properties of nano- and micro-particles filled polymer composites used for the dental restorative applications. Nanotribological performances of the two polymer composites with different reinforcing particulates were investigated using advanced microscopy techniques. Both the polymer composites composed of same dimethacrylate based monomeric mixture, Bisphenol-A-glycidyldimethacrylate (Bis-GMA), triethylene glycoldimethacrylate (TEGDMA), urethane dimethacrylate (UDMA), as matrix. It was found that the elastic modulus, hardness, particle size, shape, distribution and agglomeration significantly influence the friction and wear characteristics of the polymer composites. The results show that nanotribological performance of nanoparticle reinforced polymer composites is better than the microparticle reinforced polymer composites.

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