LEGO bricks are made of thermoplastics. Thermoplastics are a type of plastic that can be melted and reshaped multiple times through heating and cooling processes. This property allows LEGO bricks to be easily assembled and disassembled, making them versatile and reusable for building various structures. **

Thermosetting plastics do not undergo polymerization because they are already in a fully cured and cross-linked state. This means that the polymer chains are already interconnected and cannot undergo further polymerization. Once thermosetting plastics are molded and cured, they cannot be melted or reshaped like thermoplastics, making them more rigid and durable. This cross-linked structure also gives thermosetting plastics better resistance to heat and chemicals compared to thermoplastics. **

Thermosetting plastics such as phenolic resins, Pertinax, and Bakelite are generally considered to be non-toxic. These plastics are known for their heat resistance, durability, and electrical insulation properties, making them commonly used in various applications. However, like with any material, proper handling and disposal practices should be followed to prevent any potential environmental or health risks. **

Yes, thermosetting plastics have monomers with more than 2 binding sites. These monomers have the ability to form cross-linked networks, which makes the resulting plastic material rigid and heat-resistant. The presence of multiple binding sites allows for the formation of strong covalent bonds between the monomers, leading to the irreversible cross-linking characteristic of thermosetting plastics. Examples of such monomers include formaldehyde, phenol, and urea. **

Compression molding is a manufacturing process in which a heated and softened material, such as thermosetting plastics, is placed into a mold cavity. The material is then compressed under high pressure until it takes the shape of the mold. The pressure and heat applied help the material to flow and fill the mold, resulting in the desired shape and size of the final product. Thermosetting plastics can become soft and malleable when heated, but they do not become liquid like thermoplastic materials. Instead, they undergo a chemical reaction when heated, which causes them to harden and become rigid once cooled. This property makes thermosetting plastics ideal for compression molding, as they can be molded into complex shapes and retain their form once cooled. **

Thermosetting plastics such as phenolic resins like Pertinax and Bakelite are generally considered to be non-toxic. These plastics are commonly used in food and beverage packaging, electrical insulation, and various other consumer products. However, it is important to note that the production and disposal of these plastics can release harmful chemicals and pollutants into the environment, which can have negative health effects. Therefore, it is important to handle and dispose of thermosetting plastics properly to minimize any potential environmental and health risks. **

Plastics are synthetic materials made from polymers, which are long chains of molecules. They are lightweight, durable, and can be molded into various shapes, making them ideal for a wide range of applications. The main difference between thermoplastics and thermosetting plastics lies in their response to heat. Thermoplastics can be melted and reshaped multiple times without undergoing any chemical change, while thermosetting plastics undergo a chemical reaction when heated and cannot be reshaped once they have been set. This means that thermoplastics are recyclable, while thermosetting plastics are not. **

A thermosetting plastic, such as Duroplast, forms after polycondensation or polymerization because of the cross-linking of polymer chains. During polycondensation or polymerization, the monomers undergo chemical reactions to form long chains of polymers. In the case of thermosetting plastics, these polymer chains are further cross-linked through additional chemical reactions, which create a three-dimensional network structure. This cross-linking makes the material rigid and infusible, giving it its characteristic properties of high heat resistance and dimensional stability. **