%0 Journal Article
%T Statistical Taguchi Optimization For Preparation and Adhesion Evaluation of Epoxy Insulator To the Surface of Double Base Propellant Grain - Statistical Taguchi Optimization For Preparation and Adhesion Evaluation of Epoxy Insulator To the Surface of Double Base Propellant Grain - Open Access Pub
%A Milad Saadat Tagharoodi
%A Saeed Babaee
%A Zahra Monjezi
%J OAP | Home | Journal of New Developments in Chemistry | Open Access Pub
%D 2018
%X In this work, Taguchi design (orthogonal array, OA9) was used for the adhesion investigation of an epoxy insulator to a double base (DB) propellant grain. In this manner three epoxy resins based on diglycidylether bisphenol A (DGEBA) and three polyamine curing agents with an active diluent based on DGEBA were used. Therefore, the effects of resin type, curing agent type with its amount and diluent quantity as main factors were investigated on the single lap shear strength (adhesion strength) and then the results were quantitatively evaluated by the analysis of variance (ANOVA). The data given of ANOVA predicted that the best adhesion strength of 15.584 ¡À 1.606 MPa was obtained for the optimum conditions of MANA POX-102 as epoxy resin, H-37 as curing agent with 57 phr, ERYSYS GE-30 as diluent with 5 phr. In comparison, practical result of adhesion strength obtained for the optimum conditions was 15.4 ¡À 0.2 MPa. Also the Pull-off test results on the surface of the DB propellant showed that the maximum adhesion strength (related to the optimal conditions) is 2.64 ¡À 0.2 MPa. DOI10.14302/issn.2377-2549.jndc-18-2479 Insulation and insulators for rocket motors containing double base (DB) propellants were developed in recent decades 1. One way to provide thermal protection of a DB propellant motor is applying a polymeric material between the inner surface of case and the casted propellant. One of the important characteristics of the insulating material is proper mechanical properties such as tensile strength, elongation and adhesion. This prevents deformation of the DB grain along with separation of the insulator from the grain, liner and motor during various phases of manufacturing, storage and handling 2. The matrix of DB propellant insulators usually consists of organic materials such as epoxy resins, plastics and phenolic compounds. Epoxy resins provide excellent strength and adhesion to a wide range of materials such as solid propellants. This advantage makes them indispensable in adhesive applications where high strength is prerequisite 2, 3. Epoxy resins belong to a family of molecules or oligomers having epoxide groups (oxiranes). The greatest commercial epoxy resin is formed by the reaction of bisphenol A and epichlorohydrin. Therefore, this resin is well known as the diglycidyl ether bisphenol A or DGEBA 4. Some advantages of epoxy resins are high chemical resistance, flexibility, processability, curing at ambient temperature and compatibility with DB propellants. Also, their mechanical properties such as tensile strength and adhesion strength are
%U https://www.openaccesspub.org/jndc/article/919