Investigating the Interphase in Hydroxyl-Terminated Polybutadiene (HTPB) Composites via Dynamic Mechanical Analysis 37 Table 3 Activation Energy calculations for Tg and second tanδ peak Tg (◦C) values at each test frequency Sample 0.01 Hz 0.1 Hz 1 Hz 10Hz Ea (kJ/mol) R2 HTPB -83.76 -80.25 -76.26 -70.75 169.16 0.993 P4000 -82.92 -79.9 -76.16 -71.15 186.46 0.991 P4000-SC -82.98 -79.99 -75.98 -71.00 182.44 0.991 P0040 -85.16 -80.82 -76.99 -72.75 175.47 0.999 P0040-SC -83.97 -81.03 -76.97 -71.96 179.84 0.991 P0080 -85.39 -81.95 -77.97 -73.58 181.70 0.999 P0080-SC -84.07 -80.97 -77.94 -73.04 198.12 0.989 P00170 -85.07 -80.57 -77.69 -73.16 185.11 0.993 P0170-SC -83.49 -81.47 -76.55 -71.89 179.22 0.976 P0280 -84.24 -81.03 -77.3 -72.09 179.19 0.991 P0280-SC -84.09 -80.80 -76.79 -73.21 197.23 0.999 2nd tan δ peak temperature (◦C) at each test frequency Sample 0.01 Hz 0.1 Hz 1 Hz 10Hz Ea (kJ/mol) R2 HTPB -58.77 -52.91 -45.13 - 136.66 0.996 P4000 - - - - - P4000-SC -50.9 -44.00 - 141.30 1.00 P0040 -40.52 -34.97 -35.82 279.28 0.621 P0040-SC -52.03 -49.98 -48.05 478.58 0.999 P0080 -31.76 -26.85 -26.82 347.70 0.755 P0080-SC -41.02 -35.03 -26.06 145.41 0.991 P00170 -38.7 -33.82 -31.97 300.37 0.934 P0170-SC -35.28 -32.32 -26.95 262.63 0.976 P0280 -38.36 -35 -31.97 338.81 0.999 P0280-SC -30.05 -27.79 -10.39 104.59 0.841 Fig. 6 Interaction parameter Avs temperature where parameter Ahas an inverse relationship with particle-binder interfacial strength particle sizes until approximately -10 ◦C, where the P4000 sample continues increasing at the same slope, and all other samples exhibit a slope increase. There are not many differences between the P0040, P0080, P0170, and P0280 samples until they exhibit their respective decreases at warmer temperatures.
RkJQdWJsaXNoZXIy MTMzNzEzMQ==