Polyethers polyoxymethylene

The simplest type of polyether, polyoxymethylene, is obtained by the similar polymerisation of formaldehyde in the presence of water ... 

Cyclic ether and acetal polymerizations are also important commercially. Polymerization of tetrahydrofuran is used to produce polyether diol, and polyoxymethylene, an excellent engineering plastic, is obtained by the ring-opening polymerization of trioxane with a small amount of cycHc ether or acetal comonomer to prevent depolymerization (see Acetal resins Polyethers, tetrahydrofuran). 

Besides being commercially referred to as polyacetal materials polyformaldehydes are also often known as polyoxymethylenes and are the simplest type of a family of aliphatic polyethers. 

NH3 (ammonia) 1. Wettability enhaneement 2. Suppressing of losses of plastifieator 3. Enhaneement of adhesion Aromatic polyamides, wool, polyether, rough cotton fabric Polyvinylchloride (PVC) Polyoxymethylene (acetal), polytetrafluoroethylene (PTFE), polyearbonate (PC), polyaerylate, polyphenyleneoxide... 

ABS Acrylonitrile-butadiene-styrene HOPE High-density polyethylene LDPE Low-density polyethylene MoS Molybdenum disulfide PA Polyamide(s) PAI Polyamide-imide PBT Polybutylene terephthalate PEEK Polyether ether ketone PEI Polyether imide PET Polyethylene terephthalate PI Polyimide PMMA Polymethylmethacrylate POM Polyoxymethylene PP Polypropylene PPS Polyphenylenesulfide PSU Polysulfone PTEE Polytetrafluoroethylene PU Polyurethane PVDE Polyvinylidine fluoride UHMWPE Ultra-high molecular weight polyethylene UV Ultraviolet XPE Crosslinked polyethylene Source Author s own files ... 

Figure 1 Cost-related (specific) flexural strength of major thermoplastics, versus cost-related (specific) thermal tolerance. The unit cost is the market price in US cents (1992) of 1 cm plastics. The thermal tolerance is the temperature difference (AT) over room temperature (AT — T - room T), by which temperature (7 ) the flexural modulus is equal to 1 GPa. Designations, abbreviations WFRP-S, wood fiber reinforced PP (S type) of AECL, Canada (See Table 1) PMMA, polymethylmethacrylate PVC, pol)winyl chloride PS, polystyrene PP, polypropylene UP, unsaturated polyesters PA-GF, glass fiber (35%) reinforced polyamide PHR, phenolic resin EP, epoxy resin ABS, acrylonitrile/butadiene/styrene copolymer UF, urea/formaldehyde LDPE, low density polyethylene PC, polycarbonate POM, polyoxymethylene CAB, cellulose acetate butyrate LCP, liquid crystal polymers PEEK, polyether-etherketone PTFE, polytetrafluorethylene.

Most polymers used today are thermoplastics. Poiypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), and polystyrene (PS) often find application as low-end consumer items, packaging or others. Technical parts are produced mostly from acrylonitrile-butadiene-styrene-copolymer (ABS), polyamide (PA), polybutylene terephthalate (PBT), polyoxymethylene (POM), polyether sulfone (PES), polycarbonate (PC), polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), polyether ether ketone (PEEK), or polyimide (PI). Polyvinyl chloride (PVC) is a material often used in building construction, especially for roofing membranes, window frames, and pipes, and its properties (rigid or flexible) are generally modified by additives. 

Plastics without oxygen in their molecular chains are always subject to strong oxidative degradation. For plastics with intramolecular oxygen (polyether, polyethylene oxide, and polyoxymethylene) the influence of external oxygen during irradiation is small. 

Polyoxyl 20 stearate. See PEG-20 stearate Polyoxyl 40 stearate. See PEG-40 stearate Polyoxyl 50 stearate. See PEG-50 stearate Polyoxyl 55 stearate. See PEG-55 stearate Polyoxymethylene glycols. See Formaldehyde Poly [oxy(methylsilylene)]. See Methicone Polyoxypropylene (9). See PPG-9 Polyoxypropylene (12). See PPG-12 Polyoxypropylene (17). See PPG-17 Polyoxypropylene (20). See PPG-20 Polyoxypropylene (26). See PPG-26 Polyoxypropylene (30). See PPG-30 Polyoxypropylene (34). See PPG-34 Polyoxypropylene (40). See PPG-40 Polyoxypropyleneamine. See Polyether polyol Polyoxypropylene (3) methyl ether. See PPG-3 methyl ether Polyoxypropylene/polyoxyethylene block polymer Polyoxypropylenefpolyoxy-ethylene copolymer. See EOfPO block polymer or copolymer Polyoxypropylene triol. See Polyether polyol Polyphosphoric acid, ammonium saH. See Ammonium polyphosphate Polyphosphoric acids, compds. with triethanolamine Polyphosphoric acids, esters with triethanolamine. See TEA-polyphosphate Polyphosphoric acid sodium saH. See Sodium polyphosphate Polyphosphoric acids, potassium saHs. See Potassium polyphosphate Polyphosphoric acids, sodium salts. See Sodium polyphosphate Polyphosphoric acid, triethanolamine ester. See TEA-polyphosphate Polypropene. See Polypropylene Polypropylene CAS 90034)7-0... 

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