PTMO polytetramethylene oxide

Flexible segment PEO (Polyethylene oxide). "Flexible segment PTMO (Polytetramethylene oxide). Rigid segment PA6 (Polyamide-6). 

Ti and Zr containing polytetramethylene oxide (PTMO) ceramic hybrid materials have lately been prepared by a sol-gel technique [61, 62]. Trialkoxy silane capped organic oligomer (PTMO or polyarylene ether sulfones) backbones with titanium isopropoxide or Zr-(n-propoxide) are used in this process ... 

DBU DMC DMF EC EO EOS GSS ILs MBMTBP MEA MW PC PDMS PEG PEGda PEO PMPS PO PPG PPGda PTC PTHF PTMO PVP Diazabicyclo[5.4.0] -undec-7-ene Dimethylcarbonate Dimethylform amide Ethylene carbonate Ethylene oxide, oxyethylene Equation of state Gas-saturated solution Ionic liquids 2,2,-methylene-bis(4-methyl-6-tert-butylphenol) Monoethanolamine Molecular weight Propylene carbonate Polydimethylsiloxane Polyethylene glycol Poly(ethylene glycol) diacrylate Polyethylene oxide Poly(methylphenylsiloxane) Propylene oxide Poly(propylene glycol) Poly(propylene glycol) diacrylate Phase-transfer catalyst Poly(tetrahydrofuran) Polytetramethylene oxide Polyvinyl pyrrolidone... 

Pebax is a thermoplastic elastomer PA is an aliphatic polyamide hard block (e.g., nylon-6, nylon-12) and PEG is an amorphous polyether (polyethylene oxide (PEO) or polytetramethylene oxide (PTMO)) soft block (Scheme 4.2). 

Typical DSC thermograms of segmented polyurethanes are shown in Figure 5 (43). The samples are based on MDI-BD hard segments combined with either polytetramethylene oxide (PTMO) or polytetra-methylene adipate (PTMA) as soft segment. The nomenclature has been established whereby the two figures following the ET (PTMO/ BD/MDI copolymer) or ES (PTMA/BD/MDI copolymer) indicate the... 

Figure 1 shows stress-strain curves for the commercial polyether polyurethane and for PU-13, made from methane diphenyl dllsocyanate (MDI), butane diol (BD), and polytetramethylene oxide diol of molecular weight, 2000 (PTMO 2000). There is little difference in stress values for aged and imaged polymers. 

Biomer (trade name of Ethicon, USA). Believed to be primarily a segmented block copolymer of polytetramethylene oxide (PTMO)/MDI/ethylene diamine. Available as either a 30 wt% solution or as an extruded grade. A new type is a copolymer of polyurethane with hydroxy-terminated polydimethyl siloxane (PDMS) (Fig. 13.15). 

Biomer and PeUethane are traditional segmented polyether urethanes based on polytetramethylene oxide (PTMO), methylene-bis-phenyldiisocyanate (MDI), and ethylenediamine (ED) or butanediol (BD), respectively. They possess an excellent balance between physicochentical and biological properties together with ease of processing. For many years, they have been employed for fabrication of artificial ventricles or heart valves as well as for other cardiovascular devices. However, their use has been discontinued due to their lack of long-term performance and permeability to water and water vapor. That makes polyether urethanes suitable only for short-term applications such as peripheral or CVCs. 

Polyether polyols based on polytetramethylene oxide (PTMO), sometimes called polytetrahydrofurane (PTHF), have better strengths than PPG polyols, mainly due... 

P[AB] copolyoxetanes are viscous oils with low glass transition temperatures. Atactic structures preclude crystallization, which stands in contrast to commonly employed polyether glycols, such as polytetramethylene oxide, PTMO-2000 =... 

The ozonization is carried out with (-) tetrahydrohumulone (1 g 2.73 x lOr mol), dissolved in ethyl acetate (10 ml) during several hours at -20°C. The ozonide is decomposed with zinc and acetic add as follows zinc dust (10 g 1.53 x 10 mol) is suspended in acetic acid (50 ml), the ozonized solution is added dropwise and the mixture is heated at 85°C. The solid is removed and the solvent is evaporated. The residue is treated with excess diazomethane and the reaction products are isolated by preparative gas chromatography (20 m-column, i.d. 8 mm, 25% PTMO as stationary phase [polytetramethylene oxide], 190°C). 

Kim et alP obtained hybrid PEMs based on polytetramethylene oxide (PTMO) and polydimethysUoxane (PDMS) using the sol-gel technique. 

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