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Related to Tetramethylene: Tetramethylene oxide, Tetramethylenediamine


n.1.(Chem.) A hypothetical hydrocarbon, C4H8, analogous to trimethylene, and regarded as the base of well-known series or derivatives.
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Poly(tetramethylene ether) glycol (PTMG, [M.sub.n] ~ 2,000 g/mol, Sigma-Aldrich), dimethyolpropionic acid (DMPA, Sigma-Aldrich), bis(4-isocyanatophenyl)methane (MDI, Junsei Chemical), and 1,4-butanediol (BD, Junsei Chemical) are dried overnight in a vacuum oven (JISICO J-DV01).
Bromophenol blue, acrylamide, methylenebisacrylamide, tetramethylene ethylenediamine, and Ammonium persulfate were products of Sigma-Aldrich (St Louis, MO, USA).
Deng et al., "Creating poly (tetramethylene oxide) glycol-based networks with tunable two-way shape memory effects via temperature-switched netpoints," Macromolecules, vol.
The catalyst Dabco VR 33-LV-33wt% solution of 1,4-diazobicyclo[2.2.2]octane in 2,2-dihydroxyisopropyl ether, short-chain hard-segment extender was 1,4-butanediol (1,4-BDO, from BASF, Germany), and polyol, poly(tetramethylene ether)glycol (PTMG, 1889g/mol) was obtained from BASF, Hungary.
Gong et al., "Ethylenediamine tetramethylene phosphonic acid assisted synthesis of palladium nanocubes and their electrocatalysis of formic acid oxidation," Journal of Solid State Electrochemistry, vol.
Asawapirom, "Effects of tetramethylene sulfone solvent additives on conductivity of PEDOT:PSS film and performance of polymer photovoltaic cells," Organic Electronics: Physics, Materials, Applications, vol.
Synthesis of Dialdehyde (A-1, A-2, A-3, A-4, A-5 and A-Ar) Dimethylene 1,2-bis(4-oxybenzaldehyde) (A-1), Tetramethylene 1,4-bis(4-oxybenzaldehyde) (A-2) , Pentamethylene 1,5-bis(4-oxybenzaldehyde) (A-3), Hexamethylene 1,6-bis(4-oxybenzaldehyde) (A-4), Octamethylene 1,6-bis(4-oxybenzaldehyde) (A-5) and Phenylene 1,4-bis[methylene(4- oxybenzaldehyde) (A-Ar) were synthesized according to the reported method.
Polyethers such as polyethylene glycol (PEG) or poly(tetramethylene ether) glycol (PTMEG) are also good diol modifiers for flexibility.
In this article, we synthesized three series of WUPU having the same hard segment chemistry, but with different polyether soft segment chemistries: poly(ethylene oxide)-poly(propylene oxide)-poly-(ethylene oxide) (PEO-PPO-PEO), polypropylene glycol (PPG), and poly (tetramethylene ether glycol) (PTMG).
Typically, the hard segments are composed of multiple short chain ester units, such as tetramethylene terephthalate units, and the soft segments are derived from aliphatic polyether and polyester glycols (ref.