Tag: polymers of commercial importance

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Questions Related to polymers of commercial importance

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

The commercial name of poly(methyl methacrylate) is:

  1. Lucite

  2. Plexiglas

  3. Perspex

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Poly(methyl methacrylate) (PMMA) is a transparent thermoplastic often used in sheet form as a lightweight or shatter-resistant alternative to soda-lime glass. It has since been sold under many different names, including Acrylite, Lucite, Plexiglas and Perspex.

Option D is correct.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Statement 1: Teflon has high thermal stability and chemical inertness.


Statement 2: It has strong C-F bonds.

Choose the correct option:

  1. Statement 1 is true: Statement 2 is true; statement 2 is the correct explanation of statement 1

  2. Statement 1 is true: statement 2 is true; statement 2 is not the correct explanation of statement 1

  3. Statement 1 is true; statement 2 is false

  4. Statement 1 is false; statement 2 is true
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Teflon (PTFE) is chemically inert and thermally stable due to the very high bond energy of the C-F bond, which makes it resistant to chemical attack and heat.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Fomaldehyde is the starting material for the manufacture of :

  1. backelite

  2. caprolactam

  3. D.D.T

  4. rayon
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Formaldehyde is the starting material for the manufacture of Bakelite (phenol-formaldehyde resin), which was the first synthetic plastic. Caprolactam is used for Nylon-6, DDT is a pesticide made from chloral and trichloroethane, and rayon is made from cellulose. Note: There is a typo in option A ("backelite" should be "Bakelite").

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Which polymer among the following polymers does NOT soften on heating?

  1. Bakelite

  2. Polythene

  3. Polystyrene

  4. PVC
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Thermoplastics:
A plastic material, which can be repeatedly melted-molded again and again by simple heating, is called a thermoplastic. Thermoplastics become soft and moldable on heating. They can then be recast in different shapes and cooled. On cooling the thermoplastic material hardens.

Polyethylene, polystyrene and PVC are examples.

Thermosetting plastics:
A plastic material, which cannot be repeatedly melted-molded again, is called a thermosetting plastic.thermosetting plastics do not become soft on heating and they do not change their shape on heating.
Bakelite is one example of a thermosetting plastic.