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Pressure-Sensitive Adhesives Based on Polyurethanes
Published in István Benedek, Mikhail M. Feldstein, Technology of Pressure-Sensitive Adhesives and Products, 2008
Zbigniew Czech, Rudolf Hinterwaldner
Hydroxyterminated polybutadiene (HTPB) is generally used in the preparation of adhesives, coatings, and elastomers and in many areas such as the automobile, coatings and paints, building-trade, electronics, and medicine fields [41–44].
Active Control of Fuel Position in Opposed-Flow Strand Burner Experiments
Published in Combustion Science and Technology, 2022
Clayton M. Geipel, Christopher J. Pfützner, Brian T. Fisher
This paper presents a comparison between active and passive control methods for OFB tests with hydroxyl-terminated polybutadiene (HTPB) fuel strands in a gaseous oxygen/nitrogen oxidizer stream. HTPB is a solid fuel (Ganesh et al. 2000) that is commonly used in hybrid propellant research (Hedman 2016; Krishnan and George 1998; Nardozzo et al. 2020; Young et al. 2010; Zaseck et al. 2012) and has been tested as a binder for composite fuels with energetic additives (Connell et al. 2019; Hashim, Karmakar, and Roy 2019; Lawrence et al. 2019; Sandall et al. 2017; Shark et al. 2014). This is the first application of active fuel position control to OFB tests known to the authors. This study presents a model for fuel regression rate as a function of oxidizer mass flux, oxidizer composition, and retaining wire diameter. This model provides a method for correcting wire-based OFB tests that can be used to estimate how the fuel will perform without the wire.
Combustion Characteristics of Boron-HTPB-Based Solid Fuels for Hybrid Gas Generator in Ducted Rocket Applications
Published in Combustion Science and Technology, 2019
Syed Alay Hashim, Srinibas Karmakar, Arnab Roy
The ramjet engine is considered to be an attractive propulsive device which offers simplicity, higher thrust, higher specific impulse, safety and working stability as compared to an equivalent rocket motor (Fry, 2004). Refinement of the fundamental design of solid fuel ramjet (SFRJ) engine has happened over last several decades and continues to be an active research area till date. In this field, Gany and Netzer and few other researchers have been working for last several years to build a small-scale ramjet combustion chamber which could be utilized to support analytical and numerical studies (Mady et al., 1978; Netzer, 1978; Netzer and Gany, 1991). The SFRJ have also been used to examine high-density fuel formulations containing polymer with embedded metal particles (Gany and Netzer, 1986; Natan and Gany, 1991). The most commonly used fuel is hydroxyl-terminated polybutadiene (HTPB) which also works as a binder for additives (Chiaverini et al., 1999) and provides higher specific impulse (Jain, 2002). Use of HTPB is significant to the propulsion community due to its extensive application in solid propellant rocket motors. The widespread use of HTPB is due to its desirable mechanical properties at a wide range of temperatures, even when it is highly loaded with metal particles (Muthiah et al., 1992, 1991).