Chemistry & ProductsQuestion 81 of 100
In a liquid-and-powder (acrylic) service, how do the products actually harden?
a.The liquid is the polymer and the powder is the monomer, and the bead hardens only after it goes under an LED lamp.
b.The liquid monomer and the powder polymer, with an initiator, join together in polymerization — a heat-releasing (exothermic) reaction that cures without any lamp.
c.The powder carries photoinitiators, so the bead will not form chains until UV light reaches it.
d.Polymerization is a cooling reaction, so a properly mixed bead feels cold to the client as it sets.
Explanation
Liquid-and-powder systems are a monomer (liquid) plus a polymer (powder) with a catalyst/initiator; when they meet, the small monomer units link into long chains in polymerization. That reaction gives off heat, which is why a client may feel warmth, and it needs no lamp at all. The choices that reverse monomer and polymer, or that require a lamp or photoinitiators, describe UV/LED gel, not liquid-and-powder; and polymerization releases heat rather than absorbing it.
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