Kinetics of aryl phosphinate anhydride curing of epoxy resins using differential scanning calorimetry

✍ Scribed by Chen, Leo-Wang; Fu, Shih-Chi; Cho, Ching-Sheng

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 265 KB
• Volume: 46
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199808)46:4<325::aid-pi33>3.0.co;2-i

✦ Synopsis

The curing reaction of two kinds of epoxy resins, (bisphenol A epoxy DER331, and novolac epoxy DEN438) with aryl phosphinate anhydride (9,10dihydro-9-oxa-10-phosphaphenanthrene-10-oxide)-methyl succinic anhydride (DMSA), and benzyldimethylamine (BDMA) as the catalyst, was investigated by di †erential scanning calorimetry (DSC) using an isothermal approach over the temperature range 130È160¡C. The experimental results showing autocatalytic behaviour were compared with the model proposed by Kamal, including two rate constants and and two reaction orders (m and n). The model predic- (k 1 k 2 ) tions are in good agreement with the experimental data and demonstrate that the autocatalytic model is capable of predicting the curing kinetics of both systems without any additional assumptions. The activation energies for the rate constants of DER331/DMSA and DEN438/DMSA are 77È92 kJ mol~1 and 83È 146 kJ mol~1, respectively. The obtained overall reaction order of 2 is in agreement with the reaction mechanism reported by several workers. 1998 SCI.