NSO - L.3 Synthetic Fibres and Plastics (copy)

Examples of Natural fibres

Cotton , jute , wool silk , etc.

Examples of Synthetic fibres

Rayon , Nylon , Polyster

Repeating units of small molecules to form a polymer is called …

Monomers

Process of combining monomers to form polymer is known as

Polymerisation

Examples of Synthetic polymers

Nylon terylene , melamine

Examples of Linear polymers

Polyethylene , nylon , polyesters

Examples of Branched chain polymers

Low density polythene , glycogen , starch

Examples of Cross-linked polymers

Bakelite , melamine , formaldehyde resin

Full form of PET

Polyethylene terephthalate

Organize the following fibres tensile strength in descending order

1. Nylon

2. Woo

3. Cotton

4. Silk

Desc. order-

1. Nylon

2. Silk

3. Cotton

4. Wool

State the fabrics used to make the following-

1. Polycot

2. Polywool

3. Terrycot

1. Polyester + Cotton

2. Polyester + Wool

3. Terylene + Cotton

When was Nylon first produced

1931

Examples of Thermoplastics

PVC , polythene

Examples of Thermosetting plastics

Bakelite , melamine

Full form of PVC

Polyvinyl chloride

Full form of PTFE (Teflon)

Polytetra-fluoroethene

Examples of plasticizers

Dialkyl phthalate , cresyl triphosphate