Dynamic light scattering and ultrasonic investigations during the cure reaction of an epoxy resin
✍ Scribed by Ingo Alig; Dirk Lellinger; Katja Nancke; Apostolos Rizos; George Fytas
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 560 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0021-8995
No coin nor oath required. For personal study only.
✦ Synopsis
Brillouin scattering (BS) , photon correlation spectroscopy (PCS) , and ultrasonic (US) measurements were conducted to study the curing process of diglycidyl ether of bisphenol A with butane-1,4-diol at a curing temperature of 100°C. The experimental techniques probe the primary glass-rubber transition during the curing reaction. The primary relaxation time 7 obtained from the BS and US velocity and absorption increases with curing time and hence the BS experiment measures 7 at earlier stages of cure than the US experiment. The relaxation times at a different extent of reaction and for different measuring temperatures are consistent with BS, US, PCS, and DSC measurements and conform to a single reduced Vogel-Fulcher-Hesse-Tamann equation. Furthermore, the US experiments show evidence of secondary relaxations in the epoxy system.