Showing papers on "Plastomer published in 2012"

Creep and recovery behaviors of magnetorheological plastomer and its magnetic-dependent properties

Abstract: The creep and recovery behaviors of magnetorheological plastomer (MRP) were systematically investigated to further understand its deformation mechanism under constant stress. The experimental results suggested that the time-dependent mechanical properties of MRP were highly dependent on the magnetic field and the magnetic-controllable mechanism was discussed. The influences of iron particle distribution and temperature on the creep and recovery behaviors in the absence and presence of a magnetic field were investigated, respectively. A great discrepancy was presented in creep curves for the isotropic and anisotropic MRP under an external magnetic field, which must be induced by the different particle assemblies. In addition, the creep strain of MRP tended to decrease with increasing temperature under a 930 mT magnetic field and this phenomenon was opposite to the results obtained without a magnetic field. Finally, a hypothesis was proposed to explain the temperature effect on the creep behaviors of MRP.

Elastomer Nanocomposite; Properties

Abstract: Polymer nanocomposites represent a class of materials that have assumed great importance in recent years and are the focus of extensive research. Unlike plastomer nanocomposites, the elastomer nanocomposites are in the stage of infancy in respect to their applications. In general, in polymer composites, the matrix and the filler are bonded to each other by weak intermolecular forces and covalent bonding are rarely involved. If the filler could be dispersed in the polymer matrix at the nanometre level and is able to interact with the matrix by chemical bonding, nanocomposites with significant properties improvement are obtained. These improvements can include mechanical properties (module, strength, etc.), thermal resistance, decrease in gas permeability (barrier), flammability, etc. This paper is a review of the property improvements of different elastomers using nanofillers like silicates, carbon black, metallic powders, cellulose crystals, mixture of nanofillers, etc, with the intention of obtaining ela...

Composites utilizing polymeric capstocks and methods of manufacture

Abstract: An extruded composite adapted for use as a building material includes a core having a base polymer and a filler material in a substantially homogeneous mixture and a polymeric capstock modified with an elastomer and/or a plastomer. To improve adherence of the polymeric capstock to the base polymer, the capstock can include a capstock polymer that is similar or substantially similar the base polymer. Additionally, various additives may be mixed with the capstock material to improve visual aesthetics of the product and performance of the building material, especially over time.

Anti-aging plastomer modified asphalt coating material with magnalium-based layed double hydroxide and preparation method thereof

Abstract: The invention relates to an anti-aging plastomer modified asphalt coating material used for a waterproof coiled material and a preparation method thereof. The anti-aging plastomer modified asphalt coating material with magnalium-based layered double hydroxide is characterized by being prepared from the following raw materials in percent by mass of 47% to 64% of asphalt, 10% to 15% of plastomer modifier, 1 to 8% of magnalium-based layered double hydroxide and25% to 30% of stuffing. In the invention, by using the magnalium-based layered double hydroxide, ultraviolet aging resistant performance of the plastomer modified asphalt coating material can be prominently enhanced, the service life of the plastomer modified asphalt coating material is prolonged, and broad application prospects are wide.

Laboratory study on bitumen modification for improved physical, rheological properties and the effect of short term ageing

Abstract: Bitumen ageing is one of the principal factors causing the deterioration of bitumen pavements. It is responsible for deterioration of physical and chemical properties of the bitumen binder. The influence of vehicle traffic on road pavements causes natural aging processes and gradual loss of viscoelastic properties of bitumen binders. In the present study ethylene vinyl acetate (EVA), a plastomer; llinear styrene butadiene styrene (SBS), an elastomer and crumb rubber (CR) were used in various per centages (2 to 8 per cent) as modifiers in 60/70 grade bitumen. The effect on physical properties in terms of penetration, softening point, weight loss and rheological properties of the bituminous binders in terms of their complex modulus G star and G star over sin delta before and after ageing were measured. Testing was performed at temperatures ranging from 40 deg C to 70 deg C in increments of 6 deg C at a frequency of 10 rad/sec using dynamic shear rheometer (DSR). The results show that after ageing softening point increases and penetration decreases with increasing per centage of modifier. The G star over sin delta is found to increase with increase in per centage of modifier after ageing indicating higher rutting resistance.

Modified waterproof asphalt roll for roads and bridges

Abstract: The utility model discloses a modified waterproof asphalt roll for roads and bridges. Random polypropylene plastomer modified asphalt is dipped on the upper surface and the lower surface of a piece of polyester cloth, and an upper isolation layer and a lower isolation layer are respectively adhered to the upper surface and the lower surface of a felt. The modified waterproof asphalt roll has the advantages of high temperature resistance and strong adhesion.

Polyolefin-based resin composition for extrusion foaming and expanded material thereof

Abstract: PROBLEM TO BE SOLVED: To provide a polyolefin-based resin composition for extrusion foaming capable of providing expanded material which has a high expansion ratio and is flexible regardless of a melt tension of a polyolefin-based resin, and to provide a polyolefin-based resin expanded material obtained by the polyolefin-based resin composition for extrusion foamingSOLUTION: The polyolefin-based resin composition for extrusion foaming contains (a) a polyolefin-based resin, and (b) (b1) an elastomer and (b2) a plastomer, where the mixing ratio of (a) and (b) is in the range of 90/10 to 10/90 by a mass ratio, and the mixing ratio of (b1) and (b2) is in the range fo 90/10 to 10/90 by a mass ratio

Lab study on chemical and rheological changes in modified binders

Abstract: The challenge in physical property characterization is to develop physical tests that can satisfactorily characterize key asphalt binder parameters and how these parameters change throughout the life of an HMA pavement. In India, the methods for rheological characterization of bituminous binders are inadequate to characterize the bitumen. Hence a complete rheological study and characterization of bitumen using dynamic shear rheometer would be helpful. Also there is limited insight about the chemistry of modified bitumen. Ethylene Vinyl Acetate (EVA), a plastomer; Linear Styrene Butadiene Styrene (SBS), an elastomer, and Crumb Rubber (CR) were used in the present study. The changes in rheological and chemical properties of 60/70 and 80/100 grades bitumen modified with different percentage of CR, EVA and SBS (2 to 8 per cent) were studied. The rheological properties of the bituminous binders, in terms of their complex modulus (G*), stiffness and overall resistance to deformation, storage modulus (G*), binder elasticity, loss modulus (G"), viscous behaviour and phase angle (ϐ), viscoelastic behaviour were measured. Testing was performed at temperatures ranging from 46°C to 82°C in increments of 6°C at a frequency of 10 rad/sec. The chemistry was studied using infrared spectroscopy.