The polymerisation cross linking structure generates what?

• A. Higher brittleness
• B. Greater strength and flexibility
• C. Slower cure time
• D. Increased opacity

Answer: (B)

Cross-linking builds a three-dimensional network by bonding polymer chains together. This network lets stress be shared across many chains, so the material resists deformation more effectively, giving greater strength. Because the network still allows some movement between chains rather than locking them rigidly, the film can absorb energy and deform a little before breaking, which provides a useful degree of flexibility. In nail polymers, this balance of strong, connected structure with a touch of give helps the coating resist cracking while remaining workable. It isn’t primarily about changing cure speed or making the material opaque, and while too much cross-linking can make things brittle, properly formed cross-links typically yield improved strength with maintained flexibility.