ISSN:
0887-624X
Schlagwort(e):
tristrimethylsilyl-3-amino-4-hydroxybenzoic acid
;
Marlotherm-S®
;
2-(hydroxyaryl)benzoxazole-5-carboxylic acids
;
DSC measurements
;
WAXS-powder patterns
;
thermogravimetric analysis
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Tristrimethylsilyl-3-amino-4-hydroxybenzoic acid was condensed with various aromatic acetoxy carboxylic acid chlorides in Marlotherms-S® at 20-350°C. Under these conditions formation of an amide group, ring closure to benzoxazole groups and polycondensation occur step by step in a “one-pot procedure”. The crude polyesters were hydrolyzed to yield pure 2-(hydroxyaryl) benzoxazole-5-carboxylic acids which were acetylated and polycondensed. The pure polyesters obtained in this way were characterized by viscosity and DSC measurements, WAXS-powder patterns, and thermogravimetric analyses. The polyester of 2-(4-hydrophenyl) benzoxazole-5-carboxylic acid has a degree of crystallinity 〉 90% and a short term in thermostability in air up to 500°C.
Zusätzliches Material:
5 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/pola.1991.080291208
