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A series of flame-retardant wholly aromatic polyesters was synthesized by high temperature solution polycondensation of 2-(6-oxido-6Hdibenz 具c,e典具1,2典 oxaphosphorin-6-yl)-1,4-dihydroxy phenylene (I) with various aromatic acid chlorides in o-dichlorobenzene. These polyesters have good mechanical properties (G’:10 8 –10 9Pa) up to 180°C and good thermal and flame retardant properties. The glass transition temperatures of these polyesters are in the range of 198.1°C–220.3°C. The degradation temperatures (Td 5%) in nitrogen ranged from 460°C to 495°C and char yields at 800°C are 34%–47%. The degradation temperatures (Td 5%) in air ranged from 450°C to 472°C and char yields at 800°C are 21%–32%. The activation energies of degradation ranged from 177.4 KJ/mol to 238.8 KJ/mol. The limiting oxygen indexes (LOIs) of these polyesters are in the range of 37–48.

Посилання на статтю:

Synthesis and properties of phosphorus containing polyarylates derived from 2-(6-oxido-6H-dibenz {c,e}{1,2} oxaphosphorin-6-yl)-1,4-dihydroxy phenylene / Wang Chun Shan, Lin Ching Hsuan // Polymer. – 1999. – N 40. – P. 4387–4398.

Synthesis and properties of phosphorus containing polyarylates derived from 2-(6-oxido-6H-dibenz {c,e}{1,2} oxaphosphorin-6-yl)-1,4-dihydroxy phenylene - Завантажити.