Free Nail Technician Nail Product Chemistry Questions and Answers — Questions and Answers
Question 1: In a traditional acrylic nail system, which ingredient is added to the polymer powder to initiate the polymerization reaction when mixed with the monomer liquid?
- A photoinitiator
- Hydroquinone
- Benzoyl Peroxide (BPO) (Correct answer)
- Ethyl Methacrylate (EMA)
Correct answer: Benzoyl Peroxide (BPO)
Benzoyl Peroxide (BPO) is the initiator found in the polymer powder. When it comes into contact with the catalysts in the monomer liquid, it starts the chain reaction (polymerization) that causes the acrylic to harden. Ethyl Methacrylate (EMA) is the monomer itself, a photoinitiator is used in gel systems, and hydroquinone is a stabilizer.
Question 2: UV and LED gel nail enhancements are primarily composed of short chains of monomers that are not long enough to be considered polymers. What are these short chains called?
- Plasticizers
- Oligomers (Correct answer)
- Initiators
- Solvents
Correct answer: Oligomers
Oligomers are the key ingredient in UV/LED gels. They are short chains of monomers that, when exposed to UV or LED light, link together (polymerize) to form the hard gel enhancement.
Question 3: A nail technician is preparing a client's natural nail for an acrylic application. After cleansing and dehydrating, they apply a product that chemically alters the surface of the nail plate to enhance adhesion. Which type of product are they using?
- A nail primer (Correct answer)
- A dehydrator
- A top coat
- A cuticle oil
Correct answer: A nail primer
Nail primers, both acid-based and non-acid, are used to create a strong bond between the natural nail plate and the enhancement product like acrylic or gel. While a dehydrator removes surface oils and moisture, it is the primer that chemically prepares the nail for maximum adhesion.
Question 4: Why are traditional hard gels, which have a high degree of cross-linking, typically not soakable in acetone for removal?
- The inhibition layer prevents acetone from penetrating.
- They contain oils that repel the solvent.
- The tightly woven polymer chains are resistant to being broken down by solvents. (Correct answer)
- They cure at a higher temperature, making them permanently bonded.
Correct answer: The tightly woven polymer chains are resistant to being broken down by solvents.
Cross-linking creates a strong, three-dimensional network of polymer chains. In hard gels, this network is very dense and tightly woven, making it highly resistant to solvents like acetone. This is why they must be filed off for removal, unlike soak-off gels which have fewer cross-links and are more porous.
Question 5: After curing a layer of UV gel, a nail technician notices a sticky film on the surface. What is the primary purpose of this inhibition layer?
- It indicates the gel has over-cured and needs to be filed off.
- It is a sign of product allergy and the service should be stopped.
- To add moisture back into the nail plate during the service.
- To provide a surface for the next layer of gel to adhere to. (Correct answer)
Correct answer: To provide a surface for the next layer of gel to adhere to.
The inhibition layer is a normal, uncured layer of gel that forms because oxygen in the air prevents the very top surface from curing completely. This sticky layer is beneficial as it helps the next layer of gel, polish, or top coat to bond effectively.
Question 6: Which component in traditional nail polish is responsible for creating the durable film on the nail plate as the solvent evaporates?
- Nitrocellulose (Correct answer)
- Pigment
- Plasticizer
- Acetone
Correct answer: Nitrocellulose
Nitrocellulose is the primary film-former in most traditional nail polishes. It is a polymer that is dissolved in a solvent. When the solvent evaporates, the nitrocellulose is left behind, forming a hard, shiny, and durable film on the nail.
