Describe the classification of polymer based on their structure.

Explanation

To classify polymers based on their structure, we can categorize them into three main types: linear polymers, branched chain polymers, and cross-linked polymers. Here’s a step-by-step breakdown of each type:

### Step 1: Linear Polymers
- **Definition**: Linear polymers consist of monomer units joined together in a straight chain formation.
- **Structure**: The structure can be visualized as a long, continuous chain where the monomers are linked end-to-end.
- **Properties**:
- High melting points
- High densities
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