Phenylene ether based resins

Table 10. Properties of Poly(phenylene ether)-based Resins ...

Tetramethylbisphenol A Polycarbonate Phenylene Ether-Based Resins Polysulfones... 

Noryl phenylene ether-based resins are relatively resistant to burning, and their burn resistance can be increased by judicious compounding. They may be modified with glass and other mineral fillers. Because of low moisture absorption, dimensional stability, and ability to be used over a wide temperature range, Noryl phenylene ether-based resins are especially adaptable to metallizing. However, like most amorphous polymers, they show poor solvent resistance. 

Since poly(phenylene ether)-based resins have a lightweight and are excellent in impact resistance as compared with metal or glass, the resins have been employed in a variety of fields including automobile parts, household electric appliance parts, and office automation equipment parts. However, polyCphenylene ether) resins have a bad moldabiUty. Therefore, the resins... 

However, the incorporation of the poly(styrene)-based resin, which is more flammable than the poly(phenylene ether)-based resins, lowers the heat resistant temperature of the mixed resin of poly(phenylene ether)/ poly(st5n ene) and makes the resin flammable. Therefore, a novel method that enables molding a poly(phenylene ether)-based resin without incorporating poly(styrene) has been desired. Moreover, it has also been desirable to develop a method of achieving both moldability and flame resistance at the same time. 

Poly(phenylene ether) Alloys. Poly(phenylene ether) resins (91), composed of phenoHc monomers, have a very high T. The commercial resins are based on 2,6-dimethylphenol. The resin is produced by oxidative polymerization in toluene solution over an amine catalyst (see also PoLYETPiERS, aromatic). 

Antistatic thermoplastic resin compositions that are intrinsically antistatic have been described. These are, for example, thermoplastic resin compositions composed from poly(ether ester amide) and a thermoplastic resin e.g., styrene based resins, poly(phenylene ether) resins and poly(carbonate) resins. These compositions are permanently antistatic and are excellent in their mechanical properties. The compositions are suitable for housing of optical or magnetic recording media (11). 

Nechvolodnova et al [36] studied the effect of moisture absorption on some Russian epoxy resin films (EDT-10 resin and a resin based on a diglyddyl ether of resorcinol (DGER) and mda-phenylene diamine). Equilibrium moisture absorption at 20°C reached 4-5%. The ATg values were in the range 50-80°C, with consequent reductions in static modulus, yield stress and tensile strength at room temperature. 

Figure 3.5 shows a TGA curve of a stoichiometric thermoplastic resin based on the reaction of aniline (AN), the diglycidyl ether of bisphenol A (DGEBA-AN) and compares it with a stoichiometric resin network with a high crosslink density prepared by reaction of m-phenylene diamine (mPDA) with DGEBA (DEGBA - mPDA). 

Poly(phenylene oxide) is stablized by a reaction with chlorosulfonic acid and poly(aryl ether) resins are sulfonated by a mixture of chlorosulfonic acid and a silyl halide followed by base-catalysed cleavage of the silyl group. Antistatic polyoxyphenylenes were obtained by surface sulfonation with a saturated solution of chlorosulfonic acid in n-hexane for 25-30 minutes. ... 

The importance of regularity, polarity, and chain stiffness becomes apparent in the uses of polyethers. Of the common polyethers, only polyformaldehyde, poly(ethylene oxide), and the polymer based on 2,2-dichloromethylpropylene-1,3-oxide are crystalline. Since poly(ethylene oxide) is water soluble, only the remaining two polyethers are useful structural materials. Phenoxy, phenylene oxide, and sulfone polymers are useful thermoplastics because the chain stiffness contributed by aromatic rings in the backbone raises 7 well above room temperature. Polysulfones are used in the manufacture of membranes for gas separations (Section 13.6). The aliphatic ether backbone is more conducive to low 7 s that are suitable for rubbery applications. Fully cured epoxy resins are dimensionally stable network polymers. Low-molecular-weight polymers of ethylene oxide [often abbreviated as PEG for poly(ethylene glycol)] are often listed as ingredients of... 

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