Polyoxymethylene dimethyl ethers

PB PBI PBMA PBO PBT(H) PBTP PC PCHMA PCTFE PDAP PDMS PE PEHD PELD PEMD PEC PEEK PEG PEI PEK PEN PEO PES PET PF PI PIB PMA PMMA PMI PMP POB POM PP PPE PPP PPPE PPQ PPS PPSU PS PSU PTFE PTMT PU PUR Poly(n.butylene) Poly(benzimidazole) Poly(n.butyl methacrylate) Poly(benzoxazole) Poly(benzthiazole) Poly(butylene glycol terephthalate) Polycarbonate Poly(cyclohexyl methacrylate) Poly(chloro-trifluoro ethylene) Poly(diallyl phthalate) Poly(dimethyl siloxane) Polyethylene High density polyethylene Low density polyethylene Medium density polyethylene Chlorinated polyethylene Poly-ether-ether ketone poly(ethylene glycol) Poly-ether-imide Poly-ether ketone Poly(ethylene-2,6-naphthalene dicarboxylate) Poly(ethylene oxide) Poly-ether sulfone Poly(ethylene terephthalate) Phenol formaldehyde resin Polyimide Polyisobutylene Poly(methyl acrylate) Poly(methyl methacrylate) Poly(methacryl imide) Poly(methylpentene) Poly(hydroxy-benzoate) Polyoxymethylene = polyacetal = polyformaldehyde Polypropylene Poly (2,6-dimethyl-l,4-phenylene ether) = Poly(phenylene oxide) Polyp araphenylene Poly(2,6-diphenyl-l,4-phenylene ether) Poly(phenyl quinoxaline) Polyphenylene sulfide, polysulfide Polyphenylene sulfone Polystyrene Polysulfone Poly(tetrafluoroethylene) Poly(tetramethylene terephthalate) Polyurethane Polyurethane rubber... 

Nether >s 1 for polyoxymethylene, polyepichlorohydrin (see Figure 2.4) and poly(vinyl ethyl ether), and 2 for Ultem (see Figure 2.4) and poly(vinyl butyral) (see Figure 2.9). Note that only (-0-) linkages between two carbon atoms will be counted as ether linkages. If there are silicon atoms on one or both sides of the oxygen atom, the linkage is not counted in Nether. For example, Nether=0 for poly(dimethyl siloxane). 

Cyclic Acetals. A number of cyclic acetals of varying ring size have been polymerized with cationic initiators (315) trioxane and dioxolane are the most important. Polymerization of trioxane in the presence of a transfer agent such as dimethyl formal or an anhydride yields polyoxymethylene with ether and ester end groups, respectively (316). 

The trimer of formaldehyde, 1,3,5-trioxane, has been converted to a polyoxymethylene under anhydrous conditions in ethylene dichloride solution using boron trifluoride etherate or stannic chloride as the initiator. The product needs to be stabilized to prevent thermal degradation back to formaldehyde. The capping of this polymer was carried out in dimethyl-formamide solution with an excess of acetic anhydride and a small amount of a high-boiling tertiary amine such as A, A-dimethylcyclohexylamine or... 

Hagen G. P. and M. J. Spangler, Preparation of polyoxymethylene dialkane ethers by catalytic conversion of formaldehyde formed by dehydrogenation of methanol or dimethyl ether, U.S. Patent 6,350,919 (2002). 

Engineering (CUT < 140 °C) a category comprising polyamides (PA), thermoplastic polyesters (PEST including PET, PBT), polycarbonate of bisphenol-A (PC), polyoxymethylene (POM or acetal), and poly(2,6-dimethyl-l,4-phenylene oxide), better known as polyphenylene ethers... 

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