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Microwave curing of epoxy resins with diaminodiphenylmethane—III. Pulse frequency dependence in pulsed irradiation

✍ Scribed by Nadir Beldjoudi; Albert Gourdenne

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
331 KB
Volume
24
Category
Article
ISSN
0014-3057

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✦ Synopsis

Pulse frequency dependence of the emciency of the activation of crosslinking reactions of DGEBA epoxy~liaminodiphenylmethane mixtures by pulsed microwaves working at an electromagnetic frequency of 2.45 GHz, a ratio pulse length/pulse period of 1/5 and an average electrical power of 40 W, is studied, through the variations of the initial rates of heating of the samples and the gel times. Three optimized frequencies of pulse (1 kHz, 200 and 23.8 Hz) are found, and their attribution in terms of relaxations of short chain segments is discussed.

📜 SIMILAR VOLUMES

Microwave curing of epoxy resins with di
Microwave curing of epoxy resins with diaminodiphenylmethane—IV. Average electrical power and pulse length dependence in pulsed irradiation
✍ Nadir Beldjoudi; Albert Gourdenne 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 347 KB

A~tract--Pulse length dependence of the efficiency of the activation of curing reactions of epoxydiaminodiphenylmethane resins by pulsed microwaves (2.45 GHz) is studied at three pulse periods (1, 5 and 42 msec) or frequencies (1000, 200 and 23.8 Hz) previously revealed for a pulse length (r)/pulse

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✍ Nadir Beldjoudi; Abdelaziz Bouazizi; Driss Douibi; Albert Gourdenne 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 269 KB

Samples of DGEBA epoxy resins with diaminodiphenylmethane as curing agent are submitted for crosslinking to microwaves applied with continuous or pulsed regimes. The variations with time of temperature and of the associated dielectric loss show that the discontinuous process is more efficient then t