Question

Thermoplastics are:

• (A) Linear polymers
• (B) Soften or melt on heating
• (C) The molten polymer can be moulded in the desired shape
• (D) All of the above

Answer 1

The Correct Option is D

Explanation:
Thermoplastics are linear or slightly branched long-chain molecules. They are capable of repeatedly softening on heating and hardening on cooling. The molten thermoplastics can be molded in the desired shape. It is a polymer that becomes pliable or moldable above a specific temperature and returns to a solid-state upon cooling.Hence, the correct option is (D).

Answer 2

Ans. In reality, polymers are polymers. Polymers are high molecular mass substances created by forming consistent covalent connections between a larger number of small molecules.

• The simple molecules that combine to produce polymers are referred to as monomers. 
• The process of creating polymers is known as polymerization, and co-polymers are those polymers created by combining two or more distinct monomers.
• Thermoplastics are a class of linear polymers that may be repeatedly softened by heating and repeatedly toughened by cooling with minimal change to their physical characteristics.
• There are no cross-links between the chains, and the intermolecular forces in these polymers are midway between those of elastomers and fibers.
• Thermoplastics commonly used today include Teflon, polyvinyl chloride, polystyrene, and polythene.
• Thermoplastics are thus linear polymers that soften or melt when heated and may be molded into the required shape while still molten.

Thermoplastic polymers have several properties that make them widely used in various applications:

1. Melting and Re-Shaping: They can be melted and molded into any desired shape, and re-melted and reshaped as many times as needed without undergoing chemical changes.
2. Density: Their density varies from light to heavy, depending on the type of polymer and its application.
3. Impact Resistance: They have good impact resistance, making them ideal for products that are subjected to stress and impact.
4. Chemical Resistance: Some thermoplastic polymers are highly resistant to chemicals, such as acids and bases, making them suitable for use in harsh chemical environments.
5. Electrical Conductivity: The electrical conductivity of thermoplastic polymers varies depending on the type of polymer and the presence of additives. Some are electrically insulating, while others are electrically conductive.
6. Thermal Stability: Thermoplastic polymers have high thermal stability, meaning that they can withstand high temperatures without breaking down.
7. Processability: They are easy to process, making them a popular choice for mass production of consumer goods and other products.
8. Recyclability: Many thermoplastic polymers are recyclable, which makes them environmentally friendly and reduces waste.
9. Cost-effective: They are relatively inexpensive compared to other types of polymers, making them a cost-effective choice for many applications.