illustrate with a simple diagram, a linear polymer and a cross linked polymer
Answers
Several monomers linked end to end as long chains in linear fashion are liner polymers. Polymer chains inter-linked by covalent bonds are cross-linked polymers.
Explanation:
Polymers are repeating chains of units of monomers. Polymers are broadly classified into three types based on their chemical composition, nature and properties when temperature is applied, namely
- Thermoplastic polymers
- Thermosetting polymers
- Elastomers
Based on their structures they are further classified as:
- Linear polymers
- Branched polymers
- Cross linked polymers
Linear polymers:
When monomers are linked end to end to each other as long chains in linear fashion they are called liner polymers. They have the ability of changing their shape when temperature is applied. They are highly recyclable. Thermoplastics is an example of linear polymer.
Cross linked polymers:
When polymer chains are inter-linked to each other by covalent bonds they are called cross-linked polymers. They are unstable under heat and cannot undergo repeated cycles of temperature. Thermosetting polymers and Elastomers are examples of cross linked polymers.
Answer:
The key difference between cross linked polymer and linear polymer is that the monomer units of linear polymers have end-to-end links, resembling the beads in a necklace, whereas cross linked polymers are made up of chains that are joined together by a series of covalent bonds, called cross-links.