Abstract
The sessile drop test is used to measure the static contact angle that commercial variants of HTPB make with polytetrafluorethylene and ammonium perchlorate solid substrates to determine if the molecular weight, OH-group content and viscosity properties affect wettability phenomena. Furthermore, the interfacial tensions for each of the three-phase systems of HTPB/AP are determined using analytical techniques. Results using image processing software show commercial variants of HTPB forming contact angles on AP ranging from 27.0 – 40.1°. The contact angle of HTPB on PTFE ranged from 86.0 – 88.0°. The surface tension of the polymers did not impact the magnitude of the contact angle significantly. The surface tension of all polymers except PolyBD R45 was constant. The wettability of AP varied greatly with which crystal face formed the liquid-solid interface. At the interface, the existence of hairline fractures on the crystal possibly affected the contact angle formed. Also, a first-order measurement of the surface free energy of AP and calculation of liquid-solid interfacial energy is performed. Limitations of the measurement are discussed.
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