Rheological and Interfacial Property of Nano-Al with HTPB, GAP and PET

Rheological and interfacial property of nano-Al with Hydroxyl-terminated polybutadiene (HTPB), glycidyl azide polymer(GAP) and poly(ethyleneoxide-co-tetrafuran)(PET) were investigated by means of RS-300 rheometer, DCAT21 dynamic contact angle measuring instrument, interface surface tension meter (Germany) and X-ray photoelectron spectroscopy (xps). Rheological properties of three binders and nano-Al/binder suspensions in the mixing ratio of 1: 2 were discussed. Results show that Three kinds of binders exhibit pseudoplastic characteristics with the apparent viscosity of less than 3 Pa.s, and have weak interaction between molecular chain segment of itself. Within 30 similar to 60 degrees C, with temperature increasing, the apparent viscosity of nano-Al suspensions decreases, in which the nano-Al/HTPB and nano-Al/GAP belong to pseudoplastic fluid of sensitive to temperature, with flow activation energy of 38.05 kJ/mol and 52.07 kJ /mol, respectively, but nano-Al/PET belongs to a bingham fluid of sensitive to changes in the shear rate, with flow activation energy of only 1.506 kJ/mol. The contact angles of nano-Al, GAP, HTPB and PET were measured by means of dynamic contact angle/surface tension instrument. The calculated values of adhesion and spread coefficient of nano-Al with binders decrease in the order Wnano-Al/PET > Wnano-Al/GAP > Wnano-Al/HTPB and Snano-Al/PET > Snano-Al/GAP > Snano-Al/HTPB. The results indicate that the interactions of nano-Al with binders decrease in the order nano-Al/PET > nano-Al/GAP > nano-Al/HTPB, which is consistent with the trends of apparent viscosity of the suspensions. Binding energy of Oxygen in nano-Al/HTPB is 532.03 ev, which is bigger than that of nano-Al, and indicate a strong action between nano-Al and HTPB.