Polymerisation of polyfunctional monomers (functionality > 2) tends to produce networks. Which general property outcome is most associated with such crosslinked polymers?

Introduction / Context:
Monomer functionality dictates polymer architecture. When functionality exceeds two, networks form at gelation, resulting in thermoset behaviour and enhanced structural properties.

Given Data / Assumptions:

• Crosslinking restricts chain mobility.
• Mechanical strength and heat resistance increase with network density (to a point).
• Melting is not observed for fully cured networks.

Concept / Approach:
Crosslinked polymers cannot flow like viscous melts; their rigidity and cohesive strength generally rise. Therefore, “good mechanical strength” is the characteristic outcome, whereas low viscosity/melting are inconsistent with networks.

Step-by-Step Solution:
Recognise effect of functionality on network formation.Relate crosslinks to strength and dimensional stability.Select “Good mechanical strength.”

Verification / Alternative check:
Phenolic and epoxy composites demonstrate high strength due to crosslinked matrices.

Why Other Options Are Wrong:
Low viscosity/low melting: contradict network behaviour.None of these/unlimited cold flow: incorrect; networks resist flow.

Common Pitfalls:
Assuming more crosslinks always increase toughness; excessive crosslinking can embrittle despite high strength.

Final Answer:
Good mechanical strength