TGDDM-DDS Cure Reactions

In the 30-90 min cure time range there is a 30% increase in the ROH intensity, despite 95 % of the P.A. s being consumed after 30 min. This increase could be caused 

The increase in the Relher throughout the cure is associated with the E-OH reaction which consumes 50% of the total epoxides. 

The cure reactions of TGDDM-DDS (25 wt.-% DDS) epoxy were monitored as a function of BF3 NH2C2H5 concentration (0-5 wt.-%) in the 100-177 °C cure temperature range. The cure reactions were accelerated with increasing BF3 NH2C2H5 concentration and shifted to lower cure temperatures. 

The cure and degradation reactions of TGDDM-DDS epoxies were also monitored by FTIR in the 177-300 °C as a function of DDS concentration (0-35 wt.-%). Three series of epoxies were studied containing (i) 0 wt.-% BF3 NH2C2HS, (ii) 0.4 wt.-% BF3 NH2C2H5 and (iii) 0.4 wt.-% BF3 NH2C2Hs-acetone mixed. 

In Fig. 15 we illustrate data for a TGDDM-DDS epoxy series (0 wt.-% BF3 NH2C2H5) in which the disappearance of the epoxides and P.A. s in % and the appearance of the S.A. s, OH s and ethers in the form of INH so2. Roh and Rether values, respectively, are plotted as a function of DDS concentration and cure conditions. Similar plots were generated for the other two BF3 NH2C2H5 epoxy systems. 

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