An analysis of the mechanical properties of HTPB-propellants using DMA

2020 ◽  
pp. 81-91
Author(s):  
Katarzyna Gańczyk-Specjalska ◽  
Paulina Magnuszewska
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Mechanical Analysis ◽  
Thermomechanical Properties ◽  
Dynamic Force ◽  
Rocket Propellants ◽  
Hard Segments ◽  
Solid Rocket ◽  
Solid Rocket Propellants

The paper presents the thermomechanical properties of solid rocket propellants containing hydroxyl-terminated polybutadiene. Dynamic mechanical analysis (DMA) was used in analysing the mechanical properties of propellant for two different sample geometries (cuboid and cylindrical). Nonisothermal and isothermal analyses were carried out in two holders: dual-cantilever and compression. The glass transition temperature of soft and hard segments in the propellants, the effect of dynamic force on sample strain, the creep-relaxation process (based on which parameters in the Burgers model were calculated) were determined based on the results of the analysis.

scholarly journals Synthesis of HTPB using a semi-batch method

2020 ◽  
pp. 192-202
Author(s):  
Michał Chmielarek ◽  
Wincenty Skupiński ◽  
Zdzisław Wieczorek
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Peroxide ◽  
Synthesis Method ◽  
Batch Method ◽  
Synthesis Conditions ◽  
Rocket Propellants ◽  
Wide Range ◽  
Military Applications ◽  
Solid Rocket ◽  
Solid Rocket Propellants

Hydroxyl-terminated polybutadiene is widely used in industry for both civil and military applications. In munitions, HTPB is mostly used as a binder for heterogenic rocket propellants and as a component of plastic bonded explosives, as well as a phlegmatizer in explosives sensitive to friction and impact. The wide range of HTPB applications results from the good mechanical properties of HTPB-based polyurethanes, in particular at temperatures down to –40 °C. A synthesis method for HTPB, different from the commonly used semi-batch and continuous methods, is presented. The effect of parameters including reaction temperature, 1,3-butadiene pressure and hydrogen peroxide concentration on the properties of the obtained polymer is determined. The synthesis conditions enabling new HTPB species to be obtained, which meet the requirements for binders used in solid rocket propellants, are specified.

Determination of glass transition activation energy for homogeneous solid rocket propellants

2019 ◽  
Author(s):  
Marcin Cegła ◽  
Piotr Ruliński ◽  
Janusz Zmywaczyk ◽  
Piotr Koniorczyk
Keyword(s):  
Activation Energy ◽  
Glass Transition ◽  
Rocket Propellants ◽  
Solid Rocket ◽  
Solid Rocket Propellants

Influence of different crosslinking mixtures on the mechanical properties of composite solid rocket propellants based on HTPB

2020 ◽  
pp. 095400832094035
Author(s):  
Islam K Boshra ◽  
Guo Lin ◽  
Ahmed Elbeih
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Crosslinking Agent ◽  
Weight Ratio ◽  
High Strength ◽  
Rocket Propellants ◽  
Wide Range ◽  
Solid Rocket ◽  
Solid Rocket Propellants ◽  
Composite Solid

The crosslinking agent is a vital key which affects the mechanical properties of composite solid rocket propellants (CSRPs). Under this scheme, the effect of crosslinking mixtures (CMs) based on trimethylolpropane (TMP) as a triol crosslinker and butanediol (BD) as a chain extender on CSRPs based on hydroxyl-terminated polybutadiene was investigated. A series of 27 propellant compositions was formulated to study the mechanical properties of the prepared CSRPs. The effect of changing the weight ratio of TMP to BD in the CM was studied. In addition, the influence of increasing the percentage of CM (from 0% to 0.5%) in the prepared samples was investigated. Also, the effect of the CM on CSRPs containing different curing ratio of NCO/OH = 0.7, 0.75, and 0.8 was studied to generate the largest possible strain-ability with high strength over different levels of curing conditions. The mechanical characteristics (tensile strength and strain) of the prepared CSRPs have been measured and plotted versus CM content, NCO/OH and TMP:BD ratio. Generally, the addition of CM leads to a remarkable enhancement in the propellant mechanical properties. Samples containing TMP:BD (2:1) provide the highest strength while samples containing TMP:BD (1:2) show the highest strain over all the NCO/OH ratios. Formulations with TMP:BD (1:1) give high strength with moderate strain. Variation in CM content has a remarkable influence on the mechanical properties of CSRPs. A wide range of tensile strength and strain were obtained from this study to offer variety of results suitable for different applications in the CSRPs technology.

scholarly journals A Thermal aging and catalyst concentration effects on thermo-dynamical and mechanical properties of a polyester fiberglass composite

10.30544/630 ◽  
2021 ◽  
Author(s):  
Belaid Salim ◽  
Salem Fouad Chabira ◽  
Pascale Balland ◽  
Ahmed Maati ◽  
M. Sebaa
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Catalyst Concentration ◽  
Mechanical Analysis ◽  
Point Of View ◽  
Dsc Analysis ◽  
Concentration Effects ◽  
Fiberglass Composite

This work deals with the characterization by physicochemical and mechanical analysis performed on composite polyester fiberglass plates molded by contact and aged in thermo-stated ovens to simulate their deleterious environment of use. The DSC analysis revealed that the catalyst concentration affected the thermal behavior of the composite. Indeed, the addition of a higher catalyst concentration slightly lowered the glass transition temperature. From a mechanical point of view, it was observed that the catalyst addition made the material stiffer. The properties at fracture were also affected by the catalyst concentration and varied irregularly with aging.

scholarly journals Viscoelastic properties of hydroxyl-terminated poly(butadiene) based composite rocket propellants

2014 ◽  
Vol 68 (4) ◽  
pp. 435-443 ◽  
Author(s):  
Sasa Brzic ◽  
Ljiljana Jelisavac ◽  
Jela Galovic ◽  
Danica Simic ◽  
Jelena Petkovic
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Free Volume ◽  
Loss Modulus ◽  
Mechanical Analysis ◽  
Thermal Coefficient ◽  
Fractional Free Volume ◽  
Rocket Propellants ◽  
Wide Range

In the present study, the viscoelastic response of three composite solid propellants based on hydroxyl-terminated poly(butadiene), ammonium perchlorate and aluminum has been investigated. The investigation was surveyed by dynamic mechanical analysis over a wide range of temperatures and frequencies. The mechanical properties of these materials are related to the macromolecular structure of the binder as well as to the content and nature of solid fillers. The storage modulus, loss modulus, loss factor and glass transition temperature for each propellant sample have been evaluated. The master curves of storage (log G' vs log ?) and loss modulus (log G'' vs log ?) were generated for each propellant. A comparison of logaT vs temperature curves for all propellants indicate conformance to Williams-Landel-Ferry equation. Choosing the glass transition as the reference temperature, WLF equation constants are determined. Fractional free volume at the glass transition temperature and thermal coefficient of free volume expansion values are in accordance with the consideration that Al is reinforcing filler.

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