Xylylene plastic

A rare example of a crystallisable aromatic polyamide used as a plastics material is poly-m-xylylene adipamide. 

Although the first two materials discussed in this chapter, the polyphenylenes and poly-p-xylylenes, have remained in the exotic category, most of the other materials have become important engineering materials. In many cases the basic patents have recently expired, leading to several manufacturers now producing a polymer where a few years ago there was only one supplier. Whilst such competition has led in some cases to overcapacity, it has also led to the introduction of new improved variants and materials more able to compete with older established plastics materials. 

See Xanthan gum XB 4122. See Epoxy resin X-Cide 508. See 2,2-Dibromo-3-nitrilopropionamide m-XDI. See m-Xylylene diisocyanate Xenene. See Biphenyl o-Xenol. See o-Phenylphenol p-Xenol. See p-Phenylphenol 3-(2-Xenolyl)-1,2-epoxypropane Hazardous Decomp. Prods. Heated to decomp., emits acrid smoke and irritating fumes Uses Plasticizer in food pkg., food-contact coatings in food-pkg. adhesives Regulatory FDA 21CFR 175.105, 175.300,... 

Mechanical and chemical resistance is equally important with the high-temperature-resistant plastics. This class consists of hydrogen-poor amorphous polymers with a rigid skeleton poly(phenylenes), poly(phenylene oxides), poly(xylylenes), aromatic polyamides, polyamides, poly(benzimi-dazoles), etc. High-temperature-resistant tibers are also made from many of these polymers (see also Chapter 38). 

Diels-Alder reactions, 133, 135 epoxidation, 69-72, 516 grafting on polyethylene, 462 hydroformylation, 44 hydrogenation, 41, 42 isomerization catalysts, 133, 484 isomerization during polymerizations, 484 isomerization kinetics, 484 isopropyl alcohol radical reaction, 207 MA copolymerization, 532, 534, 541 Michael reactions, 63-66 nitrone adducts, 224, 225 olefin copolymerization, 288 olefin ene reactions, 162 phenanthrene adducts, 181 plasticizers use, 14 production—synthesis, 14, 78-81 radical copolymerization, 270, 275-277, 307, 315, 317, 333, 345, 365, 379 radical polymerization, 239, 264, 287 reaction with allyl alcohol, 46 reaction with sodium bisulfite, 53 styrene copolymerization, 365, 483 tetraalkyl methylenediphosphonate adduct, 66 transesterification, 46 /7-xylylene copolymerization, 359 dialkyl stannyl, PVC stabilizer, 275 diaryl, synthesis from MA, 80 pyridinium, betaine intermediate, 216... 

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