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7946006 
Journal Article 
Phase transfer catalysis in polycondensation processes (XX) polyethers containing an oxetanic or propylenic spacer with potential liquid crystalline properties 
Catanescu, O; Hurduc, N; Scutaru, D; Radu, I; Simionescu, C 
1998 
Yes 
Iranian Polymer Journal
ISSN: 1026-1265 
7 
1 
41-46 
English 
WOS:000074343500005 
The present paper studies the influence of chains chemical structure on the ordering capacity of a series of copolyethers obtained from 3,3-bis(chloromethyl)oxetane or 1,3-dibromopropane and five types of bisphenols, as follows: 2,7-dihydroxynaphthalene, 4,4′-dihydroxyazobenzene, 4,4′-dihydroxy-diphenyl, 1,1-bis(4′-hydroxyphenyl)cyclohexane and 2,2-bis (3′-methyl-4′-hydroxyphenyl)propane. The polymers are synthesized by phase transfer catalysis technique and characterized by 1H NMR, DSC and optical microscopy in polarized light. Theoretical conformational analysis, using a computer MMX-88 programme, is performed, as well. The liquid crystalline polyethers behaviour is the most important property investigated. Only the polymers containing azobenzene and naphthalene units present a mesophase, but the transition temperatures are too high for a correct characterization. 
liquid crystalline polymers; polyethers; phase transfer catalysis; oxetane; theoretical conformational analysis