Moldable compositions

Rouilly A., Orliac O., Silvestre F., Rigal L. New natural injection-moldable composite material from sunflower oilcake. Bioresource Technology 97 553-561 (2005). 

PEST, PC, and an ethylene-acrylic high impact strength moldable compositions Portugall et al., 1984... 

Such soft-touch materials are usually TP Vs or thermoplastic elastomers (TPEs) which combine the moldability of thermoplastics in the melt state with elasticity, lower hardness, fracture resistance, and surface characteristics of elastomers. However, plastics and elastomers respond differently to mechanical stress. Hence, both rheological behavior and mechanical strength will to a large extent depend on the morphology of the blend which may change with change in the composition. 

The PBE dendron has a glass transition at about 40 °C and is soluble in various organic solvents (e.g., THF, acetone, toluene). It is therefore a moldable, thermoplastic, film-forming material. This practical feature is maintained for the lanthanide-cored dendrimer complexes. The complexes are partially miscible with poly(methyl methacrylate), affording transparent luminescence compositions by mixing in solvent. 

Electronic motor brushes have been made from nanotube composites that are better lubricated, cooler running, stronger, less brittle, and more accurately moldable in comparison to the traditional carbon black brushes. 

In contrast to the usual blending of cellulose via a solution medium, a fine-powdered composition was obtained by ball-milling a dry mixture of fibrous cellulose and granulated PEG without any solvent [63]. A certain extent of compatibilization of PEG with cellulose appears to occur even in their solid state, probably by insertion of parts of PEG molecules into the cellulose domains, followed by the formation of hydrogen bonds between cellulose hydroxyls and polyether oxygens. It was shown that such a mechano-chemically prepared powder was moldable three-dimensionally by facile hot-press treatment, e.g., at 120 °C for a composition of CELL/PEG = 80/20 (wt/wt) [64],... 

To identify the mechanism, the samples were submitted to high pressure (50 kg/cm2) at. around 300 °C to mold films of the grafted cellulose and moldability of the composites was examined. Unaltered cellulose fibers were observed in the films (Photo. 1). 

This moldable material primarily consists of TS polyester resin, glass fiber reinforcement, and filler. Additional ingredients, such as low-profile additives, cure initiators, thickeners, and mold-release agents are used to enhance the performance or processing of the material. As with any material, such as metallics and plastics, SMC can be formulated in-house or by compounders to meet performance requirements of a particular application such as tensile properties or Class A surface finish. Varying the type and percentage of the composition will result in variations in mechanical properties and processability. 

Kevlar pulp can be used in thermosets, thermoplastics and elastomers. Injection-moldable pellets consisting of short Kevlar fibers in a thermoplastic resin can be made These can be blended with unreinforced resins to obtain a composite with the desired volume fraction of reinforcement. 

Suspensions or dispersions of particles in a liquid medium are ubiquitous. Blood, paint, ink, and cement are examples that hint at the diversity and technological importance of suspensions. Suspensions include drilling muds, foodstuffs, pharmaceuticals, ointments and cremes, and abrasive cleansers and are precursors of many manufactured goods, such as composites and ceramics. Control of the structure and flow properties of such suspensions is often vital to the commercial success of the product or of its manufacture. For example, in consumer products, such as toothpaste, the rheology of the suspension can often determine consumer satisfaction. In ceramic processing, dense suspensions are sometimes molded (Lange 1989) and then dried and sintered or fired into optical components, porcelin insulators, turbine blades, fuel cells, and bricks (Rice 1990 Simon 1993). Crucial to the success of the processing is the ability to transform a liquid, moldable suspension into a solid-like one that retains its shape when removed from the mold. These examples could be multiplied many times over. 

U.S. Pat. No. 5,288,775 [22] describes moldable thermoset acrylic polymer composites containing 3-15% of cellulose fibers, fillers, and water the composite is a hard, high molecular crosslinking type that requires a chemical hardener. 

U.S. Pat. No. 6,479,164 [128] discloses an extrudable or moldable biodegradable composite material comprising cellulosic fiber such as wood, wood chips, or cotton, and the starch-based biodegradable binder matrix. 

It was also shown that baroplastic materials can be used as a processing aid to process high Tg homopolymer such as polystyrene (PS). To optimize the conditions, polystyrene and baroplastic materials in powder form were blended at different compositions and pressed using compression or extrading at room temperature. The results indicate that a room temperature moldable polystyrene/baroplastic blend can be obtained at 50 wt% baroplastic content with the di-block, tri-block and star-block copolymers. Figure 10 shows that the 50 wt% blend of PS (45K) and 4-arm star-block copolymer (98K, P8) can be... 

The PVC-acrylic polymer alloy previously described is characterized by high speed injection moldability and, in sheet form, by deep drawing capability, both of which are the result of low melt viscosity. A cellulose-ethyl acrylate graft copolymer compatibilizes cellulose and PEA, cellulose and PVC, as well as starch and PVC (8). These compositions containing PVC obviously have better flow properties than non-thermoplastic cellulose or starch. However, they also have better flow properties than PVC alone. 

PEI with 5-95 wt% LCP and p-amino benzoic acid or pyromellitic anhydride compatibilized moldable blends, useful as matrix for composites. Roemer Schleicher, 1993... 

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