Properties and curing kinetic of diglycidyl ether of bisphenol A cured with a phosphorus-containing diamine

✍ Scribed by Chun Shan Wang; Ching Hsuan Lin

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 283 KB
• Volume: 74
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19991114)74:7<1635::aid-app4>3.0.co;2-p

✦ Synopsis

Diglycidyl ether of bisphenol A (DGEBA) was cured with a new phosphorus-containing diamine, 1,4-bis(3-aminobenzoyloxy)-2-(6-oxido-6H-dibenz͗c,e͗͘1,2͘oxaphosphorin-6-yl)phenylene II, which was derived from 2-(6-oxido-6H-dibenz͗c,e͗͘1,2͘oxaphosphorin-6-yl)-1,4-dihydroxy phenylene and 3-nitrobenzoyl chloride followed by hydrogenation. The structure of the synthesized phosphorus-containing curing agent II was confirmed through EA, IR, 1 H-NMR, and 31 P-NMR. The curing kinetics of the DGEBA/II system were studied by the dynamic and isothermal DSC method. Dynamic kinetic parameters were calculated by using the Kissinger and Ozawa's methods, respectively. Isothermal kinetic parameters, including k 1 , k 2 , m, and n, were determined by an autocatalytic mechanism proposed by Kamal. The model gives a good description of curing kinetics up to the onset of vitrification. The glass transition temperatures of cured epoxy (DGEBA/II) were 180°C based on DMA and 170°C by DSC, respectively. The onset decomposition temperatures (T d onset) were 376 and 367°C under nitrogen and air, respectively. Char yields at 700°C were 38 and 18% under nitrogen and air, respectively. Limiting oxygen index (LOI) was 30, thus the phosphorus-containing diamine curing agent II was found to impart flame retardancy to the cured epoxy resin.