Synthesis and characterization of random semi‐flexible thermotropic liquid crystalline poly(ester‐imide)s

Abstract

SYNOPSISA series of novel poly (ester-imide) s were prepared by the reaction of meta-and parasubstituted trimellitimide dicarboxylic diacid chlorides with various diols containing four, five, six, seven, eight, nine, 10, and 12 methylene groups by a solution polymerization technique utilizing refluxing 1,2,4-trichlorobenzene as a solvent. The poly (ester-imide) s were characterized by dilute solution viscosity, infrared spectroscopy, differential scanning calorimetry, and polarized light microscopy. The inherent viscosities of the meta-substituted poly( ester-imide) s ranged from 0.06 to 0.25 dL/g while those of the para-substituted poly(ester-imide) s ranged from 0.10 to 0.65 dL/g and were obviously of higher molecular weight. The meta series were amorphous and showed no mesophase formation. All parasubstituted poly (ester-imide ) s exhibited monotropic mesophase identified as smectic A order.

Synthesis, Characterization and Properties of Poly(butylene succinate) Reinforced by Trimellitic Imide Units

“…This phenomenon was common in many crystalline polymers. At the same time, the effective reinforcement of imide units have been observed in many copolyesters 19–23. In this work, the changes in mechanical properties of copolyesters might be owed to the compositive effects of the decreased dimension of spherulites and the enhancement of imide units.…”

“…The mixture was refluxed at 210 °C until there was no hydrogen chloride gas given out. Then prepolymer 1 was obtained as shown in Scheme after the products were filtrated, washed with hexane and dried in vacuum 23. In the second step, the esterification of SA (0.5 mol) and BD (1.1 mol) was carried out in a three‐necked flask equipped with a magnetic stirrer and a distillation column at 180 °C under nitrogen atmosphere.…”

“…Polyimides are one of the most important commercial polymers because of their good thermal properties and mechanical properties 17,18. To our knowledge, the combination of polyesters and polyimides has achieved great success and yielded a series of new materials with high performance 19–23. Xiao et al19 modified poly(ethylene terephthalate) (PET) by the incorporation of imide structures.…”

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

“…mp. 178-1 80 "C. N,N'-Bis(6-hydroxyhexyl)-3,4 : 3",4"-p-terphenyldicarboximide (4) p-Toluenesulfonic acid (0,50 g) was added into a solution of compound 3 (0,Ol mol, 6,53 g) in methanol (60)/chloroform (40) of 100 mL and the mixture was refluxed for 5 h. After cooling the solution, the precipitated dihydroxy derivative 4 was collected by filtration, recrystallized three times from 1,4-dioxane and dried at 60 "C in vacuo overnight. Yield, 77%.…”

Preparation and properties of flame retardant poly(urethane‐imide)s containing phosphine oxide moiety

“…Copolymerization is a method used to overcome these limitations. Poly(ester-imide)s, [8][9][10] poly (siloxane-imide)s, 11,12 PUIs, [13][14][15] poly(ether-imide)s, [16][17][18][19] and poly(amide-imide)s 20-23 are the well-known copolymers of polyimides. As a result, by the introduction of imide groups into the polyurethane structure, it is possible to obtain a thermally more stable and easily processable polyurethanes.…”