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Dynamic light scattering and ultrasonic investigations during the cure reaction of an epoxy resin
Author(s) -
Alig Ingo,
Lellinger Dirk,
Nancke Katja,
Rizos Apostolos,
Fytas George
Publication year - 1992
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1992.070440510
Subject(s) - curing (chemistry) , diglycidyl ether , epoxy , materials science , composite material , glass transition , natural rubber , brillouin scattering , dynamic light scattering , ultrasonic sensor , polymer chemistry , bisphenol a , polymer , optics , optical fiber , physics , nanoparticle , acoustics , nanotechnology
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 τ obtained from the BS and US velocity and absorption increases with curing time and hence the BS experiment measures τ 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.