Abstract
The effect of curing agent (6610) content and temperature on the rheological behavior of the epoxy resin CYD-128 was studied by DSC analysis and viscosity experiments. The results show that the resin system meets the requirements of processing technology. A complete reaction occurs when the curing agent content (40 parts per hundred resin, phr) is a little higher than the theoretical value (33.33 phr), while the degree of reaction of the resin system is reduced when the curing agent content is lower (25.00 phr) than theoretical value. However, excessive curing agent (50.00 phr) results in a lower reaction rate. Curing agent content has little influence on gel time when curing agent content exceeded 33.33 phr and the temperature was less than 70 °C. The isothermal viscosity-time curves shift towards the –x axis when the temperature rises from 50 °C to 80 °C. Meanwhile, higher temperature results in higher reaction rates.
Highlights
Epoxy resins are commonly used as polymeric matrices in high-performance composites [1]
It can be found there is wide exothermic peak, as shown in Figure 1, and we can obtain the information from Table 1 that ∆H ranges from 275.6 to 335.7 J/g which implies a low heat release. The combination of these two results indicate that the resin system meet the processing technology requirements. ∆H from Table 1 indicates that a complete reaction occurs when the curing agent content
°C and curing agent content is less than 33.33 phr, gel time increases with the decreasing curing agent content at the same temperature; gel time shortens with the rising of constant temperature at the same phr of curing agent
Summary
Epoxy resins are commonly used as polymeric matrices in high-performance composites [1]. A comprehensive understanding of the relationship between the curing kinetics and rheological behavior is necessary to effectively control the cure process and to optimize the processing schedules and the properties of the finished product. Despite the extensive literature on the polymerisation/curing of epoxy resins with amines, detailed studies on the effects of curing agent ratio on the curing kinetic and viscosity of a special system are generally not available [9,10,11,12,13,14,15,16,17,18,19,20,21]. The present study was carried out in order to determine the relationship between curing agent ratio and rheological behavior of the resin system
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