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3. Differentiate between thermosetting and thermoplastic polymer?
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Thermosetting and thermoplastic polymers are two types of plastics that differ in their properties and applications. Here are the key differences between them:1. **Heating and Cooling**: - **Thermosetting Polymers**: Once set, they cannot be remelted or reshaped. They undergo a chemical change during the curing process, forming a rigid and insoluble structure. - **Thermoplastic Polymers**: Can be melted and reshaped multiple times. They do not undergo a chemical change during melting or cooling.2. **Structure**: - **Thermosetting Polymers**: Have a three-dimensional network structure, making them more rigid and thermally stable. - **Thermoplastic Polymers**: Have a linear or branched structure, making them less rigid and more flexible.3. **Applications**: - **Thermosetting Polymers**: Used in applications where high heat resistance and electrical insulation are required, such as in electrical insulation, adhesives, and composite materials. - **Thermoplastic Polymers**: Used in applications where flexibility and recyclability are important, such as in packaging, automotive parts, and household products.4. **Recyclability**: - **Thermosetting Polymers**: Not easily recyclable due to their rigid and insoluble nature. - **Thermoplastic Polymers**: Can be recycled multiple times through melting and reprocessing.5. **Cost**: - **Thermosetting Polymers**: Generally more expensive due to the complexity of their production process. - **Thermoplastic Polymers**: Generally less expensive and more versatile in terms of processing and applications.In summary, thermosetting polymers are more rigid, heat-resistant, and not easily recyclable, while thermoplastic polymers are more flexible, recyclable, and less expensive. The choice between them depends on the specific requirements of the application.