Reacción #1702024

Ecuación de reacción

isophthalic acid

aminophenol

2-hydroxy-6-naphthoic acid

acetic anhydride

→

maleimide

maleimidobenzoic acid

benzoic acid

acetylene benzoic acid

Disolventes

DMF

N,N-dimethylformamide

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroAlternatively, the liquid crystalline thermoset oligomer can be prepared by a bulk polymerization process in accordance with the following procedure
2. 2
   Temperaturato reflux for a predetermined time period
3. 3
   OtroAcetic acid as a by-product and unreacted acetic anhydride are removed from the reaction mixture
4. 4
   workup.ADDITIONNext, 4-hydroxybenzoic acid is added
5. 5
   Temperaturathe reaction temperature is maintained which
6. 6
   Otrothe reaction
7. 7
   Otroto give a liquid crystal oligomer

Procedimiento

Alternatively, the liquid crystalline thermoset oligomer can be prepared by a bulk polymerization process in accordance with the following procedure. In another exemplary method, isophthalic acid, aminophenol, 2-hydroxy-6-naphthoic acid and acetic anhydride are slowly heated to 150° C. with stirring in a reactor. The mixture is brought to reflux for a predetermined time period. Acetic acid as a by-product and unreacted acetic anhydride are removed from the reaction mixture. Next, 4-hydroxybenzoic acid is added, and the temperature is further raised to 320° C. and the reaction temperature is maintained which allows the reaction to proceed, to give a liquid crystal oligomer having one or two terminal alcohol groups at one or both ends of the backbone. The liquid crystal oligomer is dissolved in a proper solvent (e.g., N,N-dimethylformamide, abbreviated “DMF”), and then a compound (e.g., maleimidobenzoic acid, nadimide benzoic acid, or acetylene benzoic acid) capable of providing thermally crosslinkable reactive groups (e.g., maleimide, nadimide or acetylene groups) is added to the solution. The mixture is allowed to react to give the liquid crystalline thermoset oligomer having one or two thermally crosslinkable reactive groups at one or both ends of the backbone thereof.

Fuente