Liquid crystalline aromatic polyesters containing isophthalic acid

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Macromolecules; (United States)

DOI:https://doi.org/10.1021/ma00079a020· OSTI ID:5356260

Cai, R ^[1]; Samulski, E T ^[2]

---

1. Sherwin-Williams Co., Chicago, IL (United States)
2. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry

The authors have synthesized a series of copolyesters and terpolyesters containing the isophthalate unit in order to study the implications of nonlinear polymer backbones on liquid crystallinity. Copolyesters were prepared from isophthalic acid, hydroquinone, and terephthalic acid by melt polymerization. Poly(p-phenylene terephthalate-co-p-phenylene isophthalate)s with molar percentages of the p-phenylene isophthalate repeat unit ranging from 75 to 95 mol% exhibit melting temperatures near 350 C. The copolyester with 85 mol% of p-phenylene isophthalate exhibits a melting temperature of 355 C and a mesophase ranges of 30 C. Thermal properties of terpolyesters composed of four monomer units (isophthalic acid, hydroquinone, terephthalic acid, and p-hydroxybenzoic acid) show optimal compositions with melting temperatures below 350 C and wide mesophase ranges. The findings show that high contents of nonlinear monomers may be incorporated into polyesters without deleterious effects on liquid crystallinity in a composition range that can be processed at reasonable temperatures.

• OSTI ID: 5356260
• Journal Information: Macromolecules; (United States), Journal Name: Macromolecules; (United States) Vol. 27:1; ISSN MAMOBX; ISSN 0024-9297
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
COPOLYMERS
CRYSTAL STRUCTURE
CRYSTALS
ESTERS
FLUIDS
LIQUID CRYSTALS
LIQUIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYESTERS
POLYMERS
SYNTHESIS