Phenoxy plastic

Phenoxy Plastics 1962 H-M F F F F F Injection, blow and extrusion molding, coatings and adhesives Adhesives for pipebonding compounds, bottles... 

Occupational and environmental exposure to chemicals can take place both indoors and outdoors. Occupational exposure is caused by the chemicals that are used and produced indoors in industrial plants, whereas nonoccupa-tional (and occupational nonindustrial) indoor exposure is mainly caused by products. Toluene in printing plants and styrene in the reinforced plastic industry are typical examples of the two types of industrial occupational exposures. Products containing styrene polymers may release the styrene monomer into indoor air in the nonindustrial environment for a long time. Formaldehyde is another typical indoor pollutant. The source of formaldehyde is the resins used in the production process. During accidents, occupational and environmental exposures may occur simultaneously. Years ago, dioxin was formed as a byproduct of production of phenoxy acid herbicides. An explosion in a factory in... 

Permeability Different plastics provide different permeability properties. As an example polyethylene will pass wintergreen, hydrocarbons, and many other chemicals. It is used in certain cases for the separation of gases since it will pass one and block another. Chlorotrifluoroethylene and vinyli-dene fluoride, vinylidene chloride, polypropylene, EVA, and phenoxy merit evaluation (Chapter 4, PACKAGING, Permeability). 

Dimensional stability There is plastics with very good dimensional stability, and they are suitable where some age and environmental dimensional changes are permissible. These materials include polyphenylene oxide, polysulfone, phenoxy, mineral-filled phenolic, diallyl phthalate, epoxy, rigid vinyl, styrene, and various RPs. Such products will gain from an after-bake for dimensional stabilization. Glass fillers will improve the dimensional stability of all plastics. 

The phenoxy resins can also be plasticized with many of the common plasticizers and still maintain a high percentage of strength, while the bonding temperature is substantially reduced. An effective hot-melt adhesive is one in which polyvinyl ether is blended into the phenoxy resin. 

They are exceptionally useful in primer plastic applications where drying speed, compatibility with various kinds of topcoats, and high adhesive strength is required. Phenoxies are used in automotive and marine primers as well as in heavy-duty maintenance primers. Important use is as a vehicle for coating formulations. 

There is a common feature of the polymer composition in PC, PPO, epoxy and phenol-formaldehyde resin, all contain phenoxy moieties in their repeating unit. Hence, it is not unexpected that the major pyrolysis products of these plastics are phenols. The reason of the production of phenolic compounds is the higher bonding energy of the C-0 linkage in the phenoxy moiety related to that of other bonds along the polymer chain. 

A thermosetting plastic is a polymer that can be caused to undergo a chemical change to produce a network polymer, called a thermoset polymer. Thermosetting polymers can often be shaped with the application of heat and pressure, but the number of such cycles is severely limited. Epoxies, for which cross-linking reactions are illustrated in Eqs. (1 -9) and (I -10), are thermosetting polymers. The structurally similar phenoxies (1-22) are usually not cross-linked and are considered to be thermoplastics. 

Epichlorohydrin or chloromethyloxirane is manufactured from allyl chloride, and, in 2006, had a merchant price of US 1.66 kg [4]. It is used as a building block in the manufacture of plastics, epoxy resins, phenoxy resins, and other polymers, and as a solvent for cellulose, resins, and paints, and has also found use as an insect fumigant. Epoxy resins (aryl glycidyl ethers) are manufactured successfully in large scale (1.2 x 10 metric tons in 2000) [26] and are widely used in a variety of industrial and commercial applications [27]. These are made by addition reactions of epichlorohydrins or by epoxidation of allyl ethers or esters (Table 1.1). Epichlorohydrin can be reacted with an alkali nitrate to produce glycidyl nitrate, an energetic binder used in explosive and propellant compositions. 

Petroleum polymer resins Phenol-furfural resins Phenolic resins Phenoxy resins Phthalic alkyd resins Phthalic anhydride resins Polyacrylonitrile resins Polyamide resins Polycarbonate resins Polyesters Polyethylene resins Polyhexamothylemediamine adipamide resins Polyisobutylenes Polymerization plastics, except fibers... 

Entirely new families of plastics have emerged in the last seven years—the polycarbonates, acetals, phenoxies and polyallomers to name just a few. As predicted by Mayfield in 1959, there has been a continued and accelerating growth in the number of happy marriages of plastics with non-plastics, and with each other in alloys. 

PHENOXY BENZENE (101-84-8) Combustible liquid (flash point 239°F/115°C). Contact with strong acids, strong oxidizers may cause fire and explosions. Incompatible with chlorosulfonic acid. Attacks some plastics, rubber, and coatings. Flow or agitation of substance may generate electrostatic charges due to low conductivity. 

PHENOXY-PROPENE OXIDE (122-60-1) Combustible liquid (flash point >176 F/ >80°C). Forms unstable peroxides in air and light unless inhibitor is maintained in adequate concentrations. Contact with amines, strong acids, and strong bases may cause polymerization with spattering and the liberation of heat. Reacts violently with strong oxidizers, permanganates, peroxides, ammonium persulfate, bromine dioxide, acyl halides. Attacks some forms of plastics, coatings, and rubber. 

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