Problem 121 - Advanced Problems in Organic Chemistry for Competitive Examinations

Question

Dacron is an example of (a) polypropylene (b) polyamide (c) polyurethane (d) polyester

Step-by-Step Solution

Answer

Dacron is an example of (d) polyester.

Step 1: Understand the Options

The problem provides four options, each representing a type of polymer: (a) polypropylene, (b) polyamide, (c) polyurethane, and (d) polyester. We need to identify the polymer family to which Dacron belongs.

Step 2: Analyze the Properties of Dacron

Dacron is known as a synthetic fiber that is widely used for fabrics. It is characterized by its high tensile strength and resistance to stretching and shrinking. This information will help us identify the correct polymer.

Step 3: Match Properties to Polymer Types

Among the provided options, polyester is known for the properties that match those of Dacron, which includes resistance to stretching and shrinking, along with durability, making it suitable for use in textiles.

Step 4: Identify Dacron's Polymer Type

Given the match in properties to polyester, and knowing that Dacron is a trademark name for a type of polyester fiber, we can conclude that Dacron belongs to the polyester family.

Key Concepts

Polymer Types

Polymers come in various forms, and they are essential in our daily lives. These large, often chain-like molecules are made up of repeating units called monomers, which determine their properties and uses. Some common types of polymers include:

• Polypropylene: Known for its versatility and resistance to chemicals. It's often used in packaging and reusable containers due to its toughness and flexibility.
• Polyamide: These are commonly known as nylons and are used in textiles, automotive applications, and machinery parts owing to their strength and thermal resistance.
• Polyurethane: Renowned for its elasticity and resilience, it’s used in foams, elastomers, and certain types of fibers.
• Polyester: Famous for its use in textiles, it offers excellent strength, durability, and resistance to stretching, making it perfect for clothing and home furnishings.

Each polymer type has unique features that make them suitable for specific uses, and understanding these can help in selecting the right material for a given application.
Knowing the distinct characteristics of these polymers is crucial for applications in industrial and consumer products.

Synthetic Fibers

Synthetic fibers are human-made and manufactured using chemical processes. These fibers are versatile and offer a range of properties that can be tailored to specific needs.

• They are generally made from polymers, such as polyamides (nylon) and polyesters, and can mimic natural fibers like cotton or wool.
• The production of synthetic fibers involves the polymerization of monomers to form long chains, which are then spun into fibers.
• They are widely preferred in the fashion and textile industry due to their durability, strength, and ability to withstand different environmental conditions.

Moreover, synthetic fibers are often more affordable and adaptable than natural fibers, making them a staple in various sectors.
Among the synthetic fibers, Dacron stands out as a well-known example of polyester used prominently in textiles for its superior performance.

Polyester Properties

Polyester, particularly known in the textile industry, boasts numerous properties that make it highly desirable for many applications.

• It is strong and durable, which means it can withstand frequent use without breaking down easily.
• The material is resistant to stretching and shrinking, maintaining its shape and fit even after many washes.
• Polyester fibers are quick-drying and resistant to moisture, making them excellent for active wear and outdoor apparel.
• Additionally, polyester is often blended with other fibers to enhance durability and comfort in clothing.

The efficiency of polyester lies in its cost-effectiveness and ability to retain its appearance and feel over time. Besides, its wrinkle resistance and ease of care further add to its popularity.
This explains why brand names like Dacron have become synonymous with polyester, highlighting its broad usage and favorable properties.