Thermotropic copolyesters from phenylhydroquinone,hydroquinone,4,4'-diphenyldicarboxylic acid and p-hydroxybenzoic acid

Abstract

Copolyesters from phenylhydroquinone (Ph-HQ), hydroquinone (HQ), 4.4'diphenyldicarboxylic acid (BB) and p-hydroxybenzoic acid (HBA) were prepared and their thermal and mechanical properties were investigated.

As-spun fibres and injection moulded specimens from Ph-HQ/BB,'HBA exhibited low moduli. whereas those from Ph-HQHQ/BB/HBA exhibited high moduli probably due to the high packing density of the polymer chain caused by incorporation of HQ structural unLts. Although the modulus of as-spun fibres from Ph-HQ'BBHBA did not correlate with the number of HBA units, the modulus of injection moulded specimens decreased with increase in the number of HBA units. It is most likely that rigidity of the polymer chain was reduced by incorporation of HBA units. Thus, packing density and rigidity of the polymer chain seem to be influential factors in determining the modulus of injection moulded specimens.

Get full access to this article

View all access options for this article.

References

[1] Inoue T 1992 Progress in Pacific Polymer Science vol 2 (Berlin: Springer) p. 127-127

[2] Inoue T and Tabata N 1994 MoL Cryst. Liquid Cryst. 254 417-417

[3] Inoue T , Yamanaka T , Tabata N and Okita S 1995 High Perform. Polym. 7 303-303

[4] Inoue T , Okamoto M and Hirai T 1986 Kobunshi Ronbunshu 43 253-253

[5] Inoue T and Okamoto M 1987 Kobunshi Ronbunshu 44 151-151

[6] Inoue T and Yamanaka T 1988 Kobunshi Ronbunshu 45 667-667

[7] Inoue T and Yamanaka T 1989 Kobunshi Ronbunshu 46 75-75

[8] Inoue T , Goto N , Tabata N , Yamanaka T and Tanaka T 1989 Kobunshi Ronbunshu 46 75-75

[9] Inoue T , Yamanaka T , Goto N , Tabata N and Tanaka T 1991 Kobunshi Ronbunshu 48 765-765

10.

[10] Inoue T , Goto N , Tabata N , Yamanaka T and Tanaka T 1992 Kobunshi Ronbushu 49 969-969

11.

[11] Inoue T , Okamoto M and Hirai T 1986 Kobunshi Ronbunshu 43 267-267