On the adhesion between Hydroxyl‐Terminated Polybutadiene Fuel‐Binder and Ammonium Perchlorate. Performance of bonding agents

Hori, Keiichi; Iwama, Akira; Fukuda, T.

doi:10.1002/prep.19850100604

Cited by 18 publications

(11 citation statements)

References 2 publications

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“…Since it has been illustrated in figures 3a and 3b that the considered energetic fillers have very similar shapes, the difference of matrix/filler adhesion is probably responsible for the observed changes on the composite behaviors. This assumption is also supported by previous works on the effect of matrix/filler adhesion on the mechanical behavior of particulates composites [5] and solid propellants [11,14] arguing that the highest stress levels experienced by ammonium perchlorate filled composites compared to HMX filled composites are due to a better matrix/filler adhesion in the former case. Figure 5c shows the mechanical behavior of matrix B filled with HMX particles.…”

Section: Polyacrylate and Glass Beadssupporting

confidence: 76%

“…The high volume fraction of particles [31], the nonlinear hyperelastic behavior of the elastomer matrix, the particle size [5,10,14,31] and the matrix/particles adhesion [11,14,15] give very specific tensile properties to solid propellants compared to other class of filled polymer matrix. For instance, it has been showed that damage by filler/matrix debonding has a very significant effect on the mechanical behavior of solid propellants [20,3,1,26] that is not fully understood despite recent studies [28,29].…”

Section: Introductionmentioning

confidence: 99%

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Effects of small particles on the mechanical behavior and on the local damage of highly filled elastomers

et al. 2016

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The mechanical behavior and damage of highly filled elastomers such as propellants is studied experimentally. A model material made of a polyacrylate matrix filled with glass beads and energetic binders filled with ammonium perchlorate and HMX have been formulated. The focus is on materials containing micrometric size particles. The size of fillers was varied from a few microns to hundreds of microns in order to study the impact of the size of particles. The materials stress-strain responses and the volume changes during uniaxial tensile tests have been recorded. Microtomographic slices of strained samples have been obtained in order to look at the type of damage sustained by the acrylate/glass bead materials. It appears that in the presence of large particles, composites showing early prominent crack benefits from the addition of small particles, whereas composites showing well dispersed matrix/particle decohesion without large cracks show no change of behavior when small particles are added.

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Section: Polyacrylate and Glass Beadssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Effects of small particles on the mechanical behavior and on the local damage of highly filled elastomers

et al. 2016

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“…This difference could stem from the fact that on the one hand, in the calculations, the presence of ab onding agent was solely accounted for throught he introduction of an interphase but no modification of the filler/matrix properties was implemented. Whereas, on the other hand, bonding agent are designed to reinforce the matrix/filler bond [41].Y et, it has been demonstrated [ 8,28] that ac hange of the critical strength or of the debonding energy of the cohesive zone, which both representamodification of the interface,c an produce sucha nincrease in the stressa tbreak. stiffer the interphase, the stiffer the composite and the larger its stress at failure.…”

Section: Effect Of the Interphase Thicknessmentioning

confidence: 99%

Roles of the Interphase Stiffness and Percolation on the Behavior of Solid Propellants

Toulemonde

Diani

Pierre

et al. 2016

Propellants Explo Pyrotec

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Atomic force microscopy has provided access to local moduli for propellants prepared with bonding agents, which create a stiffness gradient in the matrix producing a stiffer interphase surrounding the fillers. The reinforcing impact of the bonding agent appears up to some distance and interphase percolation is observed. In order to better understand the impact of bonding agents on the stress and strain at break of propellants, finite element simulations are performed. Two‐dimensional periodic cells containing randomly dispersed particles are considered, including both a cohesive zone model at the filler/matrix interface to account for possible debonding and an interphase that percolates or not. The influence of the interphase stiffness and of its percolation, on the stress and strain at break of the model propellants are evaluated through the use of a microstructure‐based failure criterion.

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“…São compostos com funções orgânicas de amidas aziridínicas hidroxiladas ou não, aminas di ou trihidroxiladas, aminas cianohidroxiladas, amidas di hidroxiladas entre outras. Os agentes de ligação atuam sobre os sólidos, perclorato de amônio e alumínio, através de ligações verdadeiras e/ou por ligações secundárias, adsorção ou atração de cargas 21,23 . superfície da partícula para formar uma camada firme e resistente sobre os mesmos, envolvendo-os completamente permitindo que se liguem à matriz polimérica [25][26][27] .…”

Section: A Importância Do Agente De Ligaçãounclassified

Propelente sólido compósito polibutadiênico: I- influência do agente de ligação

Sciamareli¹,

Takahashi²,

Teixeira³

et al. 2002

Quím. Nova

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Brazilian Complete Spacial Mission, the research of Vehicle Satellite Launcher is important. The solid propellant composite used in this vehicle is made with ammonium perchlorate, aluminiun powder and hydroxy terminated polibutadiene resin. In the propellant the bonding agent has a function to promote the interaction between solids and polimeric matrix, improving mechanical properties as stress, strain, aging characteristics and moisture embrittlement. Due its importance in propellant, bonding agent is consider as industrial secret and the literature about it is generic, without greater informations.Keywords: propellants; bonding agents; influence in mechanical properties. INTRODUÇÃOPropulsores de veículos espaciais, também conhecidos como motores-foguetes, exigem propelentes especiais, altamente energéticos, que ofereçam alto impulso específico. Um motor-foguete movido a propelente sólido é constituído basicamente de um tubo metálico cilíndrico, denominado envelope motor, preenchido quase totalmente com massa propelente, o grão propelente.Propelente sólido é uma mistura complexa e estável de compostos redutores e oxidantes que, quando ignitados, queimam de uma maneira homogênea, contínua e controlada, formando a altas temperaturas moléculas gasosas de baixa massa molecular. Desta forma, ocorre na câmara do motor-foguete, um formidável aumento de espécies gasosas com grande elevação de temperatura e pressão no sistema. Na saída do motor-foguete existe um estreitamento, chamado garganta de exaustão ou tubeira, por onde os gases resultantes da queima saem acelerados. O aumento de pressão, que pode atingir em certos casos 100 Mpa, resulta no impulsionamento do foguete 1 . No motor-foguete existe, entre o envelope motor e o propelente, uma proteção térmica constituída por uma fina camada de borracha e um adesivo denominado "liner", com a finalidade de não permitir que a alta temperatura de combustão do propelente danifique a estrutura do foguete. Na Figura 1 está o esquema simplificado de um motor-foguete. COMPOSIÇÃO TÍPICA DE UM PROPELENTE SÓLIDO COMPÓSITOOs propelentes sólidos, do tipo compósito, são constituídos de três componentes principais: Uma porção orgânica, rica em carbono e hidrogênio, conhecida como binder, que serve como ligante e gerador de gases; um sal inorgânico oxidante, rico em oxigênio, e um auxiliar balístico, normalmente um metal, tendo os sólidos uma micro granulometria bem definida 2,3 . No propelente compósito o binder é a matriz elastomérica que além de conter, incorpora as partículas sólidas do metal combustível e do oxidante. Sendo a fase contínua do propelente, o binder tem múltiplas funções pois, além de ser a principal fonte de carbono e hidrogênio do propelente, deve manter unidas as partículas do metal e do oxidante, formando uma consistente massa elástica capaz de resistir às solicitações provocadas pelas tensões mecânicas e térmica. Portanto, o binder também contribui para as propriedades mecânicas do propelente. E é importante que tenha afinidade com as partes constituintes do mot...

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On the adhesion between Hydroxyl‐Terminated Polybutadiene Fuel‐Binder and Ammonium Perchlorate. Performance of bonding agents

Cited by 18 publications

References 2 publications

Effects of small particles on the mechanical behavior and on the local damage of highly filled elastomers

Effects of small particles on the mechanical behavior and on the local damage of highly filled elastomers

Roles of the Interphase Stiffness and Percolation on the Behavior of Solid Propellants

Propelente sólido compósito polibutadiênico: I- influência do agente de ligação

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