𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Thermotropic liquid-crystalline aromatic-aliphatic polyimides, 7. Poly(ester-imide)s based on 3,4:3″,4″-p-terphenyldicarboximide

✍ Scribed by Moriyuki Sato; Seiji Ujiie; Tomohiro Hirata

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
429 KB
Volume
197
Category
Article
ISSN
1022-1352

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

New thermotropic liquid crystalline semi‐rigid homo‐ and copoly(ester‐imide)s composed of the 3,4:3″,4″‐p‐terphenyldicarboximide and/or the biphenyl unit and flexible aliphatic chains were prepared by polytransesterification using a dihexanol derivative of 3,4:3″,4″‐p‐terphenyldicarboximide and/or a dioxydihexanol of biphenyl as monomers. Differential scanning calorimetry (DSC) measurements, polarizing microscope observations and powder X‐ray analyses at various temperatures indicated that the homopolymer containing the 3,4:3″,4″‐p‐terphenyldicarboximide unit forms a smectic phase and the copolymers a nematic phase. It is suggested that the 3,4:3″,4″‐p‐terphenyldicarboximide unit acts as a good mesogen.

📜 SIMILAR VOLUMES

Thermotropic liquid-crystalline aromatic
Thermotropic liquid-crystalline aromatic-aliphatic polyimides, 4. Poly(imide-urethane-carbonate)s based on pyromellitdiimide and 3,4:3′,4′-biphenyldicarboximide
✍ Tomohiro Hirata; Moriyuki Sato; Ken-ichi Mukaida 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 635 KB

## Abstract Main‐chain types of thermotropic liquid‐crystalline (LC) poly(imide‐urethane‐carbonate)s were synthesized by melt polycondensation of __N__,__N__′‐bis(6‐hydroxyhexyl)pyromellitdiimide or __N__,__N__′‐bis(6‐hydroxyhexyl)‐3,4:3′,4′‐biphenyldicarboximide with diphenyl hexamethylenedicarbam

Thermotropic liquid-crystalline aromatic
Thermotropic liquid-crystalline aromatic-aliphatic polyimides, 3. Poly(imide-carbonate)s composed of 3,4:3′,4′-biphenyldicarboximide
✍ Tomohiro Hirata; Moriyuki Sato; Ken-ichi Mukaida 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 649 KB

## Abstract __N__,__N__′‐Bis(ω‐hydroxyalkyl)‐3,4:3′,4′‐biphenyldicarboximide (__l__ = 3, 6) were prepared by a two‐step reaction (via intermediates) of 3,4:3′,4′‐biphenyltetracarboxylic dianhydride and ω‐amino‐alcohols. Polycondensation of dihydroxyalkyl derivatives of the 3,4:3′,4′‐biphenyldicarbo

Liquid-crystalline polyimides, 16. Chira
Liquid-crystalline polyimides, 16. Chiral thermotropic copoly(ester-imide)s based on isosorbide and N-(4-carboxyphenyl)trimellitimide
✍ Hans R. Kricheldorf; Nicolas Probst 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 525 KB

A series of chiral copoly(ester-imide)s was prepared by polycondensation of N-(Ccarboxy-pheny1)trimellitimide with mixtures of isosorbide and phenylhydroquinone. All copolyesters are non-crystalline. They form a cholesteric melt, when containing more than 50 mol-% of phenylhydroquinone. Containing 5

Thermotropic liquid crystalline aromatic
Thermotropic liquid crystalline aromatic-aliphatic polyimides—5. Preparation and properties of homo- and copoly(imide-carbonate)s based on benzophenonetetracarboxylic diimide and biphenyl units
✍ Moriyuki Sato; Tomohiro Hirata; Tomoaki Kamita; Ken-Ichi Makaida 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 567 KB

## Melt polycondensation of N,N'-bis(3-hydroxypropyl)- or N,N'-bis(6-hydroxyhexyl)benzophenonetetracarboxylic diimide (n = 3 and 6) and/or 6,6'-(4,4'-biphenylylenedioxy)dihexanol with propylene or hexamethylene bis(pheny1 carbonate)s (m = 3 and 6) afforded new semi-rigid homo-and copoly(imide-carb