Observation of two α-relaxation peaks in a nanoclay-filled epoxy compound
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For over 10 years, the effect of nanosilicate layers on glass transition temperature of epoxy resins has been studied by various research groups. Unfortunately, there appears to be no consensus in the literature regarding the role of nanoclay addition on α-relaxation peak ( T g-peak) in montmorillonite (MMT)-filled epoxy compounds [ 1, 2, 3, 4, 5, 6, 7, 8]. Several studies reported an increase in the overall glass transition temperature ( T g) of MMT-filled epoxies compared to the neat epoxy [ 1, 2, 3], while other studies claimed suppression of the T g in these nanocomposites [ 4, 5, 6]. There are even some results indicating that the addition of nanoclay has no effect on α-relaxation peak of epoxy resins [ 7, 8]. Table 1 contains a description of the materials investigated in these studies. The following sections contain discussions of glass transition behavior in several types of nanoclay-filled epoxies.
Summary of materials investigated in the referred studies
KeywordsEpoxy Dynamic Mechanical Analyzer Silicate Layer Hard Segment Relaxation Peak
The financial support from ARKEMA, Iranian Gas and Petrochemical Institute and Sharif University of Technology is gratefully acknowledged.
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