Which list correctly identifies the four polymer morphologies?

• A. Melted, Crystalline, Amorphous, and Semi-crystalline
• B. Linear, Branched, CrossLinked, and Network
• C. Monomeric, Dimeric, Oligomeric, and Polymeric
• D. Elastic, Viscous, Plastic, and Brittle

Answer: (B)

Polymer morphology in this sense is about how the chain architecture is arranged. The four forms described—linear, branched, crosslinked, and network—capture the main ways chains can connect and extend in space. A linear polymer is a simple, unbranched chain. Branched polymers have side chains radiating from the main backbone, which changes how they pack and flow. Crosslinked polymers form covalent bonds between chains at points along their lengths, tying chains together and creating a network-like structure. Highly crosslinked or network polymers become three-dimensional interconnected systems, giving them distinctive rigidity and solvent resistance.

The other sets mix in concepts that aren’t about how chains are connected. Melted, crystalline, amorphous, and semi-crystalline describe phase or degree of order, not the connectivity of the chains. Monomeric, dimeric, oligomeric, and polymeric describe size or molecular weight, not morphology. Elastic, viscous, plastic, and brittle describe mechanical behavior, not the structural arrangement of the chains.