Affinity - PE - The Dow Chemical Company

Kunststoffe international, 2005-11-21, Barrier Properties: Permeability of Polymer Alloys
...beforehand can be seen in Fig.4. This shows that the octane permeability of PA6 (P=2g*25µm/m2*24h) is three orders of magnitude lower than the octane permeability of PE-LD (P=2400g*25µm/m2*24h). This can be explained in terms of the greater affinity of octane for PE-LD rather than for PA6. Even more interesting is the comparison between the permeability of the alloy and the permeability of the individual polymers of which the alloy is composed. The octane permeability of the alloy is lower than ...

Kunststoffe international, 2005-11-21, Electrically Conducting Compounds: New Functional Material for the Automotive Sector
...e extruder during compounding. As its melting point is low, it is already in liquid form when incorporated into the polymer melt. The copper fibres are added because the alloy is incompatible with thermoplastics. However, because MCP200 has a high affinity for the copper fibres and attaches itself to them, incorporating the two into the thermoplastic melt together can prevent separation. The product is a free-flowing compound that fills even small cavities during injection moulding because the c...

Kunststoffe international, 2005-11-21, Exhibition Preview: North American and Canadian Products at K 2004
...ar branded film structures for stretch hood packaging. The company is also unveiling a new PE resin for medium-voltage wire and cable insulation and a new general-purpose grade for wire and cable. Dow will unveil Affinity GA plastomers, the first of a new line of specialty polyolefins for polymer modification, masterbatch carriers, and hot-melt adhesives. They boast an unusual combination of high flow and low crystallinity. Chevron Phillips is showing the latest developments in its line of mPact...

Kunststoffe international, 2005-11-21, Injection Moulding Microstructured Functional Surfaces
...ng designed, special consideration had to be accorded to production aspects. Structures with dimensions far below 100 µm can be produced in optical grade quality by machining with diamond tools. Mould steels could not be used on account of the affinity of the diamond-carbon for iron, and so only non-ferrous metals, such as brass and nickel silver, came into question [2]. The test moulded part for the studies was designed to be much larger than any microstructured parts previously considere...

Kunststoffe international, 2006-07-04, Automotive Engineering: High Soft-touch Quality in One Single Process
...e first stage of the process in a glass fibre reinforced PBT/ASA blend (grade: Ultradur S4090 IGX, BASF). It is then overmoulded in the second stage with a special polyester (grade: Pibiflex, P-Group) using the MuCell process. The close chemical affinity between the two materials ensures a good bond. Compared with the conventional production of multi-layer foam-moulded parts, the new process is considerably faster, more economical, less complex and because it is a single process, clearly advanta...

Kunststoffe international, 2006-09-08, Natural-fibre-reinforced Plastics: Considerable Potential for Improvement
...ounds based on wood and melamine resin are novel extrudable materials with considerably improved heat resistance properties, enhanced tensile and flexural strength, and increased hardness and rigidity. Because of melamine resin’s much greater affinity for wood, no adhesion promoters are required. As a result of extensive development work by the Kompetenzzentrum Holz GmbH in Linz/Austria, the third generation of Hype Wood is now available. Novel technical applications for injection moulded compos...

Kunststoffe international, 2007-08-14, Conductive Plastics
...effects resulting from the combined use of molten metal and solid copper fibers become evident. The fine dispersion of the alloy in the plastic matrix down to the nanoscale level can be discerned in the microscopic image (Fig. 3). The affinity between the copper fibers and the metal alloy ultimately leads to encapsulation and interconnection of the fibers [6]. The result is a dense three-dimensional network that cannot be achieved through use of copper fibers alone, even at the same degree of fi...

Kunststoffe international, 2007-09-19, Mastering Demanding Challenges
...e bonding when laminating or when combining PE-LD with other materials – even metals or paper. Lotader is a terpolymer that, through the combination of polyethylene, maleic acid anhydride and acrylic acid ester components, has an affinity to many different substrates. On the one hand, admixture of Lotader to a PE-LD increases its adhesion. On the other, it is possible to apply a bonding layer of the pure terpolymer between the materials to be laminated. By selecting a higher processing temperatu...

Kunststoffe international, 2007-09-19, Two-Station Mold for Injection Molding and Foaming
...operation, a dense layer up to 1.5mm thick is formed at the cold cavity wall. Due to the insulating effect of the still-warm substrate that is located on the male mold side, the melt cools down considerably slower in this area. The close chemical affinity between the two materials ensures an optimum bond between substrate and foam layer. When the cooling phase has elapsed, the machine controlling unit opens the mold in Station2 by about 3mm, whereby platen parallelism is precisely maintained. Th...

Kunststoffe international, 2007-11-21, Surface Finishing in the Cockpit
...htfast but more expensive and relatively unreactive aliphatic polyisocyanates dominate this market. The processing of such cross-linkers in aqueous systems, however, is not entirely without problems. This commences with the high affinity of isocyanates for water ("crystallization" is a consequence). This is especially so when in addition to the so-called "high runners" there are also colors that are only rarely called for. The high complexity of parts production and the short cyc...

Kunststoffe international, 2008-01-15, Elastomer Industry Has Understood
...ion molding grades with hardness values from 5 (gel soft) to 60 Shore A. In addition, there is a translucent blow molding material with a hardness rating of 50 Shore A. These TPEs provide smooth, non-tack surfaces with low dust affinity and have excellent coloration properties. Target markets are consumer goods, household appliances, office and cosmetics articles and food packaging. The exceptional Infuse OBC block architecture gives rise to performance and processing properties beyond the limit...

Kunststoffe international, 2008-02-17, Doping for Masterbatch Production
...melting point – generally less than 100°C. From this point on, they must be considered as liquid additives. The challenge now is that the viscosity of the polymer melt is very different from that of the liquid additive. In particular the chemical affinity between the carrier polymer and the additive determines the maximum possible concentration. If it is not known, it can be easily determined by means of a discontinuous laboratory mixer. In the mixing machine, the two materials first form a mult...

Kunststoffe international, 2008-04-14, Performance Enhancements for Highly Filled Compounds
...ht. The "critical" entanglement molecular weight varies according to the polymer, e.g. 7,000g/mol for polypropylene (PP), 4,000g/mol for polyethylene (PE) and 4,000 to 5,000g/mol for polyamide (PA) [10, 11]. This effect is supported by the affinity of the acid anchoring group for the most common filler types. Its chemical structure allows the product to function as a classic dispersing agent, i.e. when shear processes during compounding break up agglomerates the new filler surface is imm...

Kunststoffe international, 2009-04-16, CMOS Technology Gaining Ground
...O). Examples of these materials include poly (alkylthiophenes) and poly (triarylamines), which are known for their easy oxidizability. In contrast to this, n-conducting organic semiconductors have a high electron affinity or low reduction potential. Three examples of this are shown in Fig. 2. Another important aspect of charge carrier transport is the material used for the electrodes. Since, in the case of p-conduction, transport takes place in the energy range of the HOMO, noble and therefore s...

Kunststoffe international, 2009-10-14, More Environmentally-Friendly Driving
... hard to disperse uniformly at the end of the rubber compounding process. With Nanoprene, however, all it takes is a few revolutions of the rolls. A practical sideeffect of the presence of Nanoprenes is a simultaneous reduction in the affinity of the highly active silica for metal. This greatly reduces the problems that exist with ''''tacky'''' silica compounds. Glass Transition Temperature as a Key Characteristic Since the glass transition temperature of the nanoadditive has a striking effect o...

Kunststoffe international, 2011-01-25, Two Old Hands Stroll through the Fair
...oplastic components with the help of a robot. So it was only a small step to combine injection molding with the foaming process. However, the main obstacle so far has been the well-known high affinity of PU for steel surfaces. Together with other partners, CeraCon GmbH in Weikersheim and Plasmatreat GmbH in Steinhagen, both Germany, developed a method for processing 1-component PU in the injection mold without the use of releasing agents. Hereby, the functional or releasing layers are applied to...

Kunststoffe international, 2012-04-20, Coloring Cellulose Fiber-Reinforced Polypropylene
... case with talc or glass fibers [4]. The current challenges for NFPs are found in processability in the injection molding process. The rheological flow behavior of NFPs differs from that of conventional compounds [5]. Natural fibers have a very high affinity for water, are sensitive to high processing temperatures, are responsible for increased emission of odors and impart different impact/toughness characteristics to the composite [6, 7]. It must also be kept in mind that to improve the compati...

Kunststoffe international, 2012-11-26, Joining of Dissimilar Materials
... is the plasma treatment of the contacting surfaces. Its goal is to functionalize or activate the joint surfaces in order to increase the interaction forces between the joint partners. This process is used with plastics, for example, to increase the affinity to adhesives [7]. Investigations into Weldability For the fundamental studies into the laser transmission welding of dissimilar thermoplastics with the concepts of the adhesion-promoting single-layer films and the prior plasma treatment, the...

Kunststoffe international, 2013-05-16, Rapid Aging Prevented
... limits because of cost issues and compatibility problems between additives and polymers that lead to deposits on molds and blooming on the polymer surface. A better solution would be to use filler deactivators or coupling agents which have a high affinity for the fillers, are preferentially adsorbed and so prevent or at least reduce adsorption of the stabilizers. Effective substances range from oligomeric epoxides, silanes, titanates, graft polymers having functional groups, through to amphiphi...

Kunststoffe international, 2014-07-22, A Question of Adhesion
...plication. To deposit copper on the FRP surface, the material to be coated is dipped in an activator bath. The activator chiefly consists of palladium, which is necessary for the chemical deposition process. Since palladium has a high reaction affinity with nitrogen, nitrogen-containing groups lead to an increased concentration of palladium nuclei on the surface to be coated [8]. A measure for assessing the wettability of solid polymer surfaces is their surface energy or surface tension, which i...

Kunststoffe international, 2014-10-10, PET Recycling
...ob and produce good qualities. Different is the situation at the area of PET recycling. Here, usually polyolefin solutions are adapted which are not tailored to the special properties of PET. With the raw material polyester, one problem is the great affinity of the molecules for humidity that manifests itself during processing in the extruder in the shortening of molecules (hydrolysis) and that significantly reduces the mechanical properties of the polymer. When bottle flakes are used, the Multi...

Kunststoffe international, 2015-03-17, Bringing Light into Darkness
.... The most important properties of the optical brighteners are influenced by sulfonic acid functionalities which are bound to the stilbene derivatives (Fig. 5). The sensitivity towards metal ions and cationic polymers, the alkali solubility and the affinity to the fiber can be influenced to differing extents, depending on the degree of substitution of the sulfonic acid groups. The affinity to the fiber decreases with increasing degrees of substitution. By contrast with the matrix system, the nat...

Kunststoffe international, 2015-11-23, Trends, Sustainability, Acceptance
... marketed under the slogan "synthesized by nature" and are often biodegradable. These polymers, however, still have many shortcomings when it comes to their application properties which, due to fundamental physical principles (high water affinity), will mean that their use in at least the near future will be restricted to niche markets. The most decisive factor for opting to use plastic packaging will, however, be the limited capacity of our planet to act as a dump: Many packaging plastics are l...

Kunststoffe international, 2017-10-13, Reactive Systems and FRP
... composites, vacuum infusion and prepreg technology. The feedstocks for furfural production are agricultural wastes from the processing of sugar cane, wood, olives, oats, nuts and much more. Outdoor sports enthusiasts, because of their special affinity for nature, are interested in sustainable sports equipment. Besides traditional snowboards and skis, skateboards, longboards, kiteboards and surfboards, as well as equipment for stand-up paddling, are also available as bio-products – based on epox...