Synthesis and liquid crystal properties of thermotropic copolycarbonates composed of biphenyl and diphenylpropane moieties

Sato, Moriyuki; Tomihisa, Noboru; Komatsu, Fujio; Yahata, Toshio; Shoji, Yukiyoshi

doi:10.1016/0014-3057(90)90054-8

Cited by 16 publications

(3 citation statements)

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“…Alkylene- and arylenediphenyl dicarbonates were used as monomers reacting with aliphatic and aromatic dihydroxy compounds by melt polycondensation for the synthesis of polycarbonates. Several studies used this reaction for the synthesis and investigation of thermotropic liquid crystalline properties of homo-, co-, and terpolycarbonates prepared by this method [23,24,25,26,27,28,29,30,31,32]. Liaw and coworkers [9,33,34] used selected arylene- and alkylenediphenyl dicarbonats (e.g., bisphenol AF diphenyl dicarbonate) to prepare copolycarbonates via melt polycondensation with bisphenols (e.g., bisphenol S) and studied their thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Polycarbonates by Melt Phase Interchange Reactions of Alkylene and Arylene Diacetates with Alkylene and Arylene Diphenyl Dicarbonates

et al. 2010

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This work presents a new synthetic approach to aromatic and aliphatic polycarbonates by melt polycondensation of bisphenol A diacetates with alkylene-and arylenediphenyl dicarbonates. The diphenyl dicarbonates were prepared from phenyl chloroformate and the corresponding dihydroxy compounds. The process involved a precondensation step under a slow stream of dry argon with the elimination of phenyl acetate, followed by melt polycondensation at high temperature and under vacuum. The potential of this reaction is demonstrated by the successful synthesis of a series of aromatic-aromatic and aromatic-aliphatic polycarbonates having inherent viscosities from 0.19 to 0.43 dL/g. Thus low to intermediate molecular mass polymers were obtained. The 13 C-NMR spectra of the carbon of the carbonate group showed that the formed polycarbonates contain partial random sequence distribution of monomer residues in their chains. The polycarbonates were characterized by inherent viscosity, FTIR,

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Polycarbonates by Melt Phase Interchange Reactions of Alkylene and Arylene Diacetates with Alkylene and Arylene Diphenyl Dicarbonates

et al. 2010

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“…De Backer et al18, 19 synthesized homopolycarbonates and copolycarbonates by the melt polycondensation of aromatic dihydroxy compounds [e.g., 1,5‐bis(2‐hydroxyethoxy)naphthalene] and alkylene diphenyl dicarbonates (e.g., pentamethylene diphenyl dicarbonate) with the aim of studying the effect of length of the alkylene part on the liquid‐crystalline properties of these polycarbonates. Sato and coworkers20–25 investigated the thermotropic liquid‐crystalline properties of homopolycarbonates, copolycarbonates, and terpolycarbonates prepared from aromatic dihydroxy compounds [e.g., 6,6′‐(4,4′‐biphenylylenedioxy) dihexanol] and alkyl ene diphenyl dicarbonates [e.g., PhOCO 2 (CH 2 ) n OCO 2 Ph, where n = 2–12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of polycarbonates by melt‐phase interchange reactions with alkylene and arylene diphenyl dicarbonates

Hamouz

Sweileh

Al-Salah

2006

J of Applied Polymer Sci

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Alkylene and arylene diphenyl dicarbonates were used as monomers for the preparation of polycarbonate polymers. The diphenyl dicarbonates were first prepared from dihydroxy compounds and phenyl chloroformate. The polycarbonates were then prepared by the melt-phase polycondensation of these diphenyl dicarbonates with dihydroxy compounds as monomers. The same polycarbonates were also synthesized by a different route involving the polycondensation of a different arylene or alkylene diphenyl dicarbonates with bisphenol A diphenyl dicarbonate to give another series of polycarbonates. The process involved precondensation under a stream of nitrogen and then melt polycondensation at a high temperature and low pressure. The prepared polycarbonates were characterized by inherent viscosity measurement, Fourier transform infrared spectroscopy, 1 H-NMR and 13 C-NMR spectroscopy, and powder X-ray diffraction. The thermal properties of the polycarbonates were studied with differential scanning calorimetry and thermogravimetric analysis. With alkylene or arylene diphenyl dicarbonates as monomers, the polycondensation reactions led to the formation of polycarbonates with inherent viscosities of up to 0.68 dL/g and with high thermal stability. The glass-transition temperature values of the polycarbonates were in the range 24-1308C.

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“…hexafluoropentane chain into the polymer backbone is advantageous to improve the LC properties of main-chain polycarbonates 5 due to the Our previous articles described that the potential rigid rodlike conformation of the fluorocarbon segof liquid crystalline (LC) formation in main-chain ment arising from an intramolecular steric interpolymers composed of a biphenyl unit and an aliaction between fluorines, [6][7][8] which gives thermophatic interconnecting carbonate linkage is low tropic LC polycarbonates having more stable and compared with semirigid polyesters [1][2][3] because of well-defined LC phases. Wilson found that mainthe unusual geometry of the carbonate linkage.…”

Section: Introductionmentioning

confidence: 99%

Preparation and thermotropic liquid crystalline properties of semirigid copolyurethanes composed of biphenyl units and partially fluorinated aliphatic chains

Sato

Ujiie

Tada

et al. 1998

J. Polym. Sci. A Polym. Chem.

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Synthesis and liquid crystal properties of thermotropic copolycarbonates composed of biphenyl and diphenylpropane moieties

Cited by 16 publications

References 2 publications

Synthesis and Characterization of Polycarbonates by Melt Phase Interchange Reactions of Alkylene and Arylene Diacetates with Alkylene and Arylene Diphenyl Dicarbonates

Synthesis and Characterization of Polycarbonates by Melt Phase Interchange Reactions of Alkylene and Arylene Diacetates with Alkylene and Arylene Diphenyl Dicarbonates

Synthesis and characterization of polycarbonates by melt‐phase interchange reactions with alkylene and arylene diphenyl dicarbonates

Preparation and thermotropic liquid crystalline properties of semirigid copolyurethanes composed of biphenyl units and partially fluorinated aliphatic chains

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