Question 06 (Textile Engineering & Fibre Science)
Which one of the following stereo structures of polypropylene is (are) used for commercial fibre manufacture?
|(C)||Isotactic & Syndiotactic|
Frequently Asked Questions | FAQs
What are the three structures of polypropylene?
Polypropylene is a thermoplastic polymer that is widely used in various applications due to its excellent mechanical, thermal, and chemical properties. Polypropylene has three main structural forms, which are:
Isotactic polypropylene: This is the most common form of polypropylene and is made up of long chains of propylene monomer units that are arranged in a regular, orderly manner. In isotactic polypropylene, all the methyl groups (CH3) in the propylene monomer units are on the same side of the polymer chain, which results in a highly crystalline and rigid material.
Syndiotactic polypropylene: This form of polypropylene is similar to isotactic polypropylene but has the methyl groups in the propylene monomer units alternating on different sides of the polymer chain. This arrangement results in a more flexible and amorphous material that is less crystalline than isotactic polypropylene.
Atactic polypropylene: This form of polypropylene has a random arrangement of methyl groups in the propylene monomer units, which results in a highly amorphous and rubbery material. Atactic polypropylene is not commonly used in industrial applications but is sometimes used as a sealant or adhesive due to its high tackiness.