Which of the following is NOT a type of acrylic?

Polyacrylate is not considered a type of acrylic in the same way as the other options listed. Acrylics are typically based on compounds that contain the acrylic functional group, which includes methacrylates and acrylates. Methacrylate and acrylate are widely used in nail enhancements and other applications because they undergo polymerization, resulting in solid structures that are useful in products like acrylic nails.

Cyanoacrylate, while it is also involved in adhesive formulations, is specifically known for its rapid bonding properties and is often used in nail glues. Although it shares some similarities with acrylates in terms of bonding mechanisms, it differs fundamentally in its chemical structure and uses.

Polyacrylate, on the other hand, refers to a polymer made from acrylic acid or its derivatives. While it is related to acrylics in that it is a product of polymerization of acrylate compounds, it often serves different functions, such as superabsorbent capabilities in hygiene products, rather than applications in nail enhancements. Thus, it does not fit into the category of types of acrylic used as traditional nail enhancements like the other compounds mentioned.