Is it wrong if the mixture of Thermoplastic and Thermoset is taken into consideration in building the composite specimen. If so, please help me out in getting the exact reason.
I assume that your question is connected to the possibility and practical interest to produce blends of thermoplastics with thermosets (NB: as dispersed phase or continue network).
Typically, blends of this type are prepared by different methods: melt-blending or REX (reactive extrusion), solution casting, other techniques. These blends are performed in idea to produce materials characterized by improved thermo-mechanical characteristics, higher temperature of utilization (high-temperature creep resistance, increased HDT), specific end-use properties such as fire retardancy, and so on. It is believed that the most important challenge is to make the thermoset phase continuous while keeping the thermoplastic as the major component. To find the most adequate answer at your question I would like to recommend considering the first chapters from this book:
Thomas, Sabu, Robert Shanks, and Sarathchandran,
Design and Applications of Nanostructured Polymer Blends and Nanocomposite Systems. 2016 Elsevier Inc.