Synthese und eigenschaften einiger höhergliedriger cyclischer ätheracetale

Albrecht, Klaus; Fleischer, D.; Rentsch, Christoph; Yamaguchi, H.; Schulz, Rolf C.

doi:10.1002/macp.1977.021781202

Cited by 7 publications

(2 citation statements)

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“…Tetraethylene glycol formal (1,3,6,9,12-pentaoxacyclotetradecane) (PO C), the next higher homologous of TGF is prepared in analogous manner and has similar properties. 10 POC can also be polymerized at similar conditions, as already described by Yamashita/ 1 under formation of cyclic oligomers and polymers in an equilibrium reaction. The polymers are highly viscous or waxlike materials and can be isolated by fractionated precipitation from methanol-water and ether at ooc.…”

Section: Polymerization Of Homologous With Ring Sizes Of 14 and 17 Atomsmentioning

confidence: 67%

“…We have slightly modified the initial synthetic procedure, and obtained the triethylene glycol formal (TGF) monomer with good yield (65-70%) and high purity ( mp 27°C). 10 During the last few years the polymerization of 640 TGF has been studied extensively by Yamashita et a/Y· 12 and independently also by our group_B- 16 The main experimental results of both groups are almost identical. A short review will summarize the important facts and then some new results shall be added.…”

Section: Omfmentioning

confidence: 74%

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Some New Copolymers by Ionic Polymerization

Schulz

Albrecht

Thi

et al. 1980

Polym J

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In the first part the cationic polymerization of a homologous series of cyclic with ring sizes of 11, 14, and 17 atoms is described. During the polymerization of triethylene glycol formal (TGF) an equilibrium is reached and besides high polymers cyclic oligomers are formed. The oligomers and the polymers are built up of a regular sequence of one oxymethylene unit and three oxyethylene units -f-(OCH2) (OC2 H4 h+x· They are therefore be labelled a "sequenced copolymer." The equilibrium concentrations of the cyclic oligomers with a polymerization degree from 2 to 15 follow the equation. The 14-and 17membered monomers POC and HOC forms cyclic oligomers and high polymers of the general formula +COCH2) 1 (OC2H4)y+x with y=4 and y=5,respectively. The melting points of these sequenced copolymers withy= 1-5 are determined. Furthermore, the cationic polymerization of 1,3-dioxacycloundecane (OMF) and 1,3,6,11-tetraoxacyclotridecane (DDF) was studied. 1 H and 13 C NMR spectra show that again regular copolymers are formed: In the first case an alternating I: I copolymer +COCH2) (OC8H16)+, in the latter case a terpolymer with the regular sequence +COCH2) (OC2 H4 ) (OC4 H8) (OC2 H4 )+x· The second part deals with the polymerization of 2isopropenylnaphthalene. With maleic anhydride at room temp a charge-transfer complex is formed; at higher temp a reaction occurs. Only at low temp with UV initiation or redox initiation a copolymer is formed. With cationic catalysts a mixture of dimer, trimer, and tetramer but no polymer is obtained. The anionic polymerization yields polymers with molecular weight from 10,000 to 300,000 and melting points of 280°C and glass-transition temp of 220°C. By "living polymer" techniques block copolymers are available.

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Section: Polymerization Of Homologous With Ring Sizes Of 14 and 17 Atomsmentioning

confidence: 67%

Section: Omfmentioning

confidence: 74%