Triethylene glycol oligomer

In this way the unstable 1,3-dioxacycloalkanes and their oligomers would be converted into stable ethers. This has been proved experimentally, and the reaction offers some exciting synthetic possibilities [17, 18]. In particular, it provides a new route to a variety of new crown ethers, such as the l,4,7,10-tetraoxa-ll,ll-dimethylcyclotridecane (a 13-crown-[4]-ether) from isobutene and the formal of triethylene glycol but that is another story ... 

This reaction cannot be controlled—once it is initiated, it runs to completion. Treatment of ethylene oxide with controlled amounts of water does lead to the important coolant ethylene glycol (excess water) and the oligomers di-, tri-, and tetraethylene glycol. These are important solvents for polar compounds. Triethylene glycol is also the starting material for the synthesis of 18-crown-6 above. 

Fig. 8 (a) Reversible formation of cyclic and linear acetal oligomers from triethylene glycol and 4-nitrobenzaldehyde. (b) Reversible formation of hemithioacetal (HTA) from reaction between a thiol and an aldehyde derivative... 

Many VEU oligomers were synthesized using triethylene glycol dlvlnyl ether (TEGDVE) as a reaction solvent in place of methylene chloride. The TEGDVE was not separated from the products. It remained as part of the polymerizable mixture. 

Numerous thermal analysis studies have been performed by other groups on resin composites, which are used for small anterior restorations that do not experience substantial stress and with caution for posterior teeth because of concern about wear [1-3]. The polymer matrix contains the oligomer bis-GMA (bisphenol A-glycidyl methacrylate) or urethane dimethacrylate, and triethylene glycol dimethacrylate is a diluent. Filler particles are silane-coated for chemical bonding with tire matrix. Free-radical polymerization is carried out by chemical... 

Baccei (21) discloses polymerizable adhesive and sealant compositions having as an important ingredient urethane-acrylate-capped oligomers based on liquid hydroxyl-terminated polybutadiene or polybutadiene/ acrylonitrile copolymers. Properties associated with impact and thermal improvements are noted as well as the ability to cure adequately through the bondline gap. Model systems are largely triethylene glycol dimethacrylate based. Impressive adhesive performance properties are recorded. (Cf. Paper by Malofsky and Baccei in this... 

Additives are sometimes put into the PVA solution. Lozinsky et al. showed that by adding triethylene glycols and its higher oligomers, the strength and thermal stability of the PVA cryogels increased and the gelation process was altered [26, 27],... 

Several kinds of cross-linker are used, such as low-molecular-weight PEG, triethylene glycol dimethacrylate (TEGDM), and oligomers of PEG capped with CH2=CH-C00- or methacrylate groups. 

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