Polyphenylene Oxide NORYL

Modified Polyphenylene Oxide (NORYL ) Conventional adhesives recommended include epoxies, polysulfide-epoxies, silicone, synthetic rubber, acrylics, cyanoacrylates, and hot melts (14). 

Polystyrene Although polystyrene is usually bonded by solvent cementing, it can be bonded with vinyl acetate/vinyl chloride solution adhesives, acrylics, polyurethanes, unsaturated polyesters, epoxies, urea-formaldehyde, rubber-base adhesives, polyamide (Versamid-base), polymethylmethacrylate, and cyanoacrylates. The adhesives should be medium-to-heavy viscosity and room-temperature and contact-pressure curing. An excellent source is a Monsanto Company technical information bulletin which recommends particular commercial adhesives for bonding polystyrene to a number of different surfaces. Adhesives are recommended in the fast-, medium-, and slow-setting ranges (10). 

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A family of engineering thermoplastics based on the above technology includes PPO polyphenylene oxide, Noryl thermoplastic resins (modified... 

In 1982 the leader in structural plastics used for structural foams parts was modified polyphenylene oxide (NORYL ), accounting for almost three-quarters of all material usage. Polycarbonate held a strong second materials position, followed by ABS, with polystyrene next (5). 

Results of some of these short-term tests are shown in Table II. A comparison is given between PPS and five other plastics nylon (Zytel 101), polycarbonate (Lexan 141), polysulfone (Bakelite Polysulfone), polyphenylene oxide (Noryl), and polyetherimide (Ultem 2300). The data presented are based upon retention of tensile strength for all plastics except the Ultem 2300, which is based upon retention of flexural strength. Unsuccessful attempts were made to injection mold ASTM Type IV tensile bars out of the Ultem compound, but flexural strength bars could be made. Experience has shown that chemical resistance tests monitored by flexural strength retention are comparable to those monitored by retention of tensile strength. 

Chapter 9, Polyphenylene Ether Blends and Alloys, from GE Plastics describes traditional and new polyphenylene-ether grades based on GE Plastics Noryl . GE Plastics originally invented polyphenylene ether (PPE), its blends and alloys, and PPO polyphenylene oxide. Noryl is typically... 

Polyphenylene oxide (Noryl from GE) and polyphenylene sulfide (Ryton from Phillips) are used as high-temperature engineering plastics. Polyphenyl ether sulfones are manufactured by a number of companies under a variety of trade names including 720P, 220P by ICI and RADEL by Union Carbide. They are generally used as injection-moldable thermoplastics and in the adhesive and composite industry. 

These results demonstrate some interesting chemical principles of the use of acrylic adhesives. They stick to a broad range of substrates, with some notable exceptions. One of these is galvanized steel, a chemically active substrate which can interact with the adhesive and inhibit cure. Another is Noryl , a blend of polystyrene and polyphenylene oxide. It contains phenol groups that are known polymerization inhibitors. Highly non-polar substrates such as polyolefins and silicones are difficult to bond with any technology, but as we shall see, the initiator can play a big role in acrylic adhesion to polyolefins. 

Noryl GFN-3-70 polyphenylene oxide/polystyrene with fiberglas... 

Polyphenylene oxide (PPO) or Polyphenylene ether (PPE) is an amorphous polymer with a softening temperature of about 210 °C. To improve its processability it is mostly blended with PS (modified PPE, e.g. Noryl ), which is at the cost of its heat distortion temperature. The properties are excellent the applications are mainly in fine-mechanical construction, in automotive parts, in household equipment etc. 

To the range of engineering plastics were added polyethylene and polybutylene tereph-thalates (PET and PBT), as well as General Electric s polyethers, the PPO (polyphenylene oxide) produced through polymerization of 2,6-xylenol and the Noryl plastic produced by blending PPO with polystyrene. Other special polymers, derived like the polycarbonates from bisphenol A, were added to this range polyarylates, polysul-fones, polyetherimides. 

Injection moldable polyphenylene oxide (PPO, Noryl) was produced by A. S. Hay in the earlv 1960 s by the copper-amine catalyzed oxidation of xylends. (21)The commercial product is a blend of PPO and polystyrene. PPO is being produced at an annual rate of 70 thousand tons in the U.S. and it is anticipated that the annual production in the late 1980 s will exceed 175 thousand tons. 

Noryl . [GE Plastics GE Plastics Ltd.] Modified polyphenylene oxide resins engineering resin for inj. mcdding, ex> trasitm, structural foam used for computers, business equip., automotive, elec., electronics, construction, telecommunications, tqppliances, and other industries. 

An important requirement for plastics materials in the automotive industry is paintability alongside metal components in high temperature areas. Noryl GTX series of General Electric has been developed to meet this requirement. The blend consisting of polyphenylene oxide (PPO) in a nylon matrix combines the heat and dimensional stability and the low water absorption of PPO with the flow and semicrystalline properties of nylons. Its impact strength, however, is not as high as PC/PBT blends. 

Because of the Kmitation of temperature resistance, the use of plastic components in ovens has been mostly limited to exterior trim. Plastics however are gradually being used for semi-structural components. Endcaps with a metallic finish are a typical example. General Electric have used a sputter-coated modified Noryl polyphenylene oxide for a shiny metallic appearance for the Tappan oven. The material provides flame resistance, electrical insulation, and resistance to heat, grease, and abrasion. 

Noryl GE Plastics tradename for its family of polyphenylene oxide plastics. 

Noryls, patented by G.E. Plastics, are amorphous modified polyphenylene oxide resins. The basic phenylene oxide structure is as follows ... 

Polyphenylene-Oxide (PPO, Noryl) PPO appeared in 1964 as a conjugated oxidation product of phenolic monomers. 

In more recent times GE Plastics has upgraded their Noryl range of PS-modified polyphenylene oxide materials without recourse to halogens. Improved flame retardant properties are found in the new Noryl GTX 4110 series, which uses a proprietary flame retardancy system free from halogens and red phosphorus. The compound has high heat and chemical resistance. 

Polystyrene modified polyphenylene oxide (PPO) or Noryl can be hot plate welded at 260 to 288°C and 20 to 30 s contact time. Unmodified PPO can be welded at hot plate temperatures of 343°C. Excellent spin welded bonds are possible with modified polyphenylene oxide (PPO), because the low thermal conductivity of the resin prevents heat dissipation from the bonding surfaces. Typical spin welding conditions are rotational speed of 40 to 50 ft/min and a pressure of 300 to 400 psi. Spin time should be sufficient to ensure molten surfaces. 

Norpex, PPO-based engineering thermoplastics. Custom Resins Group Norsfl, Two-component siUcones, Insulcast Noryl, Polyphenylene oxide-based resin, GE Plastics... 

The above materials are crystalline polymers, and such materials have generally superior frictional, wear and fatigue properties, compared with amorphous polymers. However, amorphous polymers show lower mould shrinkage and where dimensional accuracy is paramount they may be preferred. Suitable engineering types are polycarbonate (PC) and noryl (styrene modified polyphenylene oxide). 

Plastics International, Noryl PPO (Modified Polyphenylene Oxide), http // www.plasticsintl.com/datasheets/419943590Noryl.pdf. 

PS-modified polyphenylene oxide is produced by GE plastics and marketed under the trade name Noryl. Applications include UL 94 V-0 flame retardant [3] PCB enclosures and glass-fibre filled self-extinguishing UL 94 V-1 relay bases. The latter application permits 600 V operation with an operating temperature of 110 °C and a short-term tolerance of 135 °C. 

Polymethyl methacrylate (PMMA) Polyphenylene sulfide (PPS) Polyphenylene oxide, modified (Noryl) Polyphenolsulfone (RADEL) Polypropylene (PP)... 

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