Problem 38 - A Complete Resource Book in Chemistry for JEE Main

Question

Synthetic human hair wigs are made from a copolymer of vinyl chloride and acrylonitrile and is called (a) Dynel (b) Cellulose (c) PVC (d) Polyacrylonitrile

Step-by-Step Solution

Answer

The correct answer is (a) Dynel.

Step 1: Understand the Components

We need to identify the copolymer that is made from vinyl chloride and acrylonitrile. These are two different chemical compounds used to create certain types of synthetic materials.

Step 2: Define Copolymer

A copolymer is a polymer derived from more than one species of monomer. In this case, it involves vinyl chloride and acrylonitrile.

Step 3: Identify the Correct Copolymer

The copolymer formed by vinyl chloride and acrylonitrile is known as Dynel. This is a trademarked name for this particular synthetic fiber.

Step 4: Match with the Options

Match the identified copolymer (Dynel) with the provided options: (a) Dynel, (b) Cellulose, (c) PVC, (d) Polyacrylonitrile. The correct match is option (a) Dynel.

Key Concepts

Vinyl Chloride

Vinyl chloride is a colorless gas that is an essential building block for various synthetic materials. One of its main uses is as a monomer in the creation of polyvinyl chloride (PVC), which is a versatile plastic used for a variety of applications, from pipes to window frames and more. In the context of synthetic fibers, vinyl chloride can be copolymerized with other monomers to create unique materials. For example, when combined with acrylonitrile, it forms a copolymer that is useful in creating synthetic fibers like Dynel.

Acrylonitrile

Acrylonitrile is a clear, colorless liquid with a slightly pungent odor, and it's used primarily as a monomer in the production of polyacrylonitrile. This material is important for the production of fibers, which are then used in textiles, particularly in making fibers that resemble wool. Acrylonitrile contributes to the thermal resistance and chemical stability of copolymers, making it particularly valuable in high-performance synthetic fibers. When acrylonitrile is copolymerized with vinyl chloride, it results in products like Dynel, known for their use in non-flammable synthetic fibers.

Dynel

Dynel is a specific type of synthetic fiber made from the copolymerization of vinyl chloride and acrylonitrile. Dynel is well-known for its use in synthetic wigs and fibers that resemble human hair. It is recognized for its safety and practical applications because it does not readily catch fire, making it a suitable choice for products that require flame resistance. Additionally, Dynel is soft to the touch and can mimic natural fibers closely, which is why it is popular in various textile applications.

Synthetic Fiber Materials

Synthetic fiber materials are manufactured fibers derived from chemical processes, often involving the polymerization of monomers like vinyl chloride and acrylonitrile. These fibers are designed to mimic natural materials and possess properties that natural fibers may not have, such as increased durability or flame resistance.

• They play a crucial role in modern textiles, providing options that are often more efficient or affordable than natural fibers.
• Synthetic fibers can be engineered for specific characteristics, such as elasticity, strength, and much more.

One major advantage of synthetic fibers is their ability to be produced in large scales, maintaining consistent quality, thereby catering to the demands of various industrial applications.