Temperature dependence of the melt viscosity of epoxy resins

✍ Scribed by L. A. Utracki; A. Ghijsels

• Publisher: John Wiley and Sons
• Year: 1987
• Tongue: English
• Weight: 197 KB
• Volume: 7
• Category: Article
• ISSN: 0730-6679
• DOI: 10.1002/adv.1987.060070104

✦ Synopsis

The zero-shew viscosity r)o of five epoxy resins were analyzed on the basis of the free volume concept. The experimental data, spanning at least six decades in viscosity, were linearized by means of a viscosity-temperaturerelation~ = q,,(T),derivedbyUtracki a few years earlier. The linearization enables the following conclusions to be drawn: (1) There is no liquid-liquid transition within the investigated temper-ature range: T/r, = 1.05-1.38 (Tg is the glass transition temperature); (2) the derived equation can be used to calculate qo vs. T dependence; and (3) the equation can be generalized to permit prediction of the 110 = qo(T) dependence of any epoxy resins (of the type studied here) on the basis of a single point determination of viscosity and Tg of the sample.