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Phase transfer catalysis of polycondensation processes—V. Internal rotation energies in polyethers based on oxetane and bisphenol-A

✍ Scribed by N. Hurduc; Gh. Surpateanu; V. Bulacovschi

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 176 KB
Volume: 28
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(92)90156-v

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✦ Synopsis

A~tract--Rotation possibilities and rotational barriers in the polyether chain obtained from bisphenol-A with 3,3-bis(chloromethyl) oxetane were considered. From the computed values, it was concluded that in such structures the bisphenol-A unit might become mesogenic.

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Phase transfer catalysis in polycondensa

Phase transfer catalysis in polycondensation processes—XI. Liquid crystalline copolyethers based on 4,4′-dihydroxydiphenyl, bisphenol-a, 4,4′-dihydroxyazobenzene and 3,3-bis(chloromethyl)oxetane

✍ N. Hurduc; V. Bulacovschi; D. Scutaru; V. Barboiu; C.I. Simionescu 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 304 KB

Abstract~Copolycondensations of 3,3-bis(chloromethyl)oxetane with various diphenols under phase transfer conditions have been performed. The copolyethers show mesomorphism; investigations of their LC properties by optical polarization microscopy and DSC analyses were carried out.