Problem 90 - Advanced Problems in Organic Chemistry for Competitive Examinations

Question

Nylon is (a) polyethylene methyl acrylate fibre (b) polyamide fibre (c) polythene derivative (d) polyester fibre

Step-by-Step Solution

Answer

The correct answer is (b) polyamide fibre.

Step 1: Identifying the Material

The first step is to identify what nylon is as a material. Nylon was one of the first synthetic fibers and was developed in the 1930s.

Step 2: Understanding the Composition

Next, we consider the chemical composition of nylon. Nylon is known as a polyamide, which is a type of polymer.

Step 3: Linking Polyamide to Options

From the provided options, we need to find which one describes a polyamide. Options (a), (c), and (d) do not relate to polyamide as they describe other types of synthetic materials.

Step 4: Conclusion

Since nylon is a polyamide and option (b) explicitly states polyamide fibre, this confirms that nylon is a polyamide fibre.

Key Concepts

Synthetic Fibers

Nylon is an example of a synthetic fiber. What does this mean? Simply put, synthetic fibers are man-made. Unlike natural fibers like cotton or wool that come from plants and animals, these are created through chemical processes, often from petrochemicals.
Nylon, created in the 1930s, was one of the first synthetic fibers developed, marking a significant advancement in textile technology. Today, synthetic fibers are widely used due to their durability, elasticity, and ability to be produced economically.

• They are often resistant to stains and can resist wrinkling.
• They are used in a variety of applications, from clothing to industrial products.

Understanding synthetic fibers helps us appreciate the versatility and importance of science in everyday materials.
With more focus on sustainability, emerging technologies are evaluating ways to produce synthetic fibers that are environmentally friendly.

Chemical Composition of Nylon

The essence of nylon lies in its chemical composition. Nylon is known as a polyamide. But what exactly is a polyamide?
Polyamides are a type of polymer that contain repeated units linked by amide bonds. These amide bonds are formed by the reaction of carboxylic acid and amine groups.
To imagine this, think of nylon as a long chain made up of repeating units, much like the links in a bicycle chain.

• The structure gives nylon its strength and resistance.
• It's engineered to be lightweight yet robust.

The chemical structure explains the resilience and flexibility of nylon fibers, and this understanding is crucial in manipulating nylon for various uses.
This flexibility and durability are why nylon is a preferable choice for many applications, from parachutes to everyday hosiery.

Polymer Types

Polymers are giant molecules made from smaller units called monomers. Nylon falls within the class of polymers. But did you know polymers can be classified further? There are two main categories: addition polymers and condensation polymers.
Nylon is a condensation polymer. What does that mean? In a condensation polymer, the formation of polymer involves the loss of a small molecule, typically water, during the bonding of monomers.
Helpful visuals might be considering condensation droplets—that’s what happens chemically!

• Condensation polymers often have amide or ester linkages.
• They are generally high in strength and resistant to chemical wear.

Understanding these polymer types may help you decide suitable materials for different uses as each type has distinct properties.

Nylon Identification

Identifying nylon among other materials can often be done by its unique features. Since nylon is a polyamide, it stands out from other synthetic fibers. When attempting to identify nylon, consider its texture and appearance.
Nylon is typically smooth and silky as compared to more fibrous textures like polyester or acrylic fibers.

• Nylon can be easily dyed, making it versatile for various colors and applications.
• It is often identified by its resilience and resistance, especially under tension, heat, or wear.

When you're in doubt, testing methods such as melting point analysis or distinguishing smell when burned (nylon has a unique celery-like smell) can be definitive. Being able to accurately identify nylon not only helps in understanding fabric compositions but also ensures the correct selection for various industrial and consumer applications.