Which substance is identified as having cellulose nitrate as its base?

Cellulose nitrate is a type of thermoplastic that is produced by the nitration of cellulose, which is derived from plant materials. This chemical process results in a material that can be molded and shaped when heated. Cellulose nitrate is the primary component in Cellulose Nitrate Plastic, commonly known as Pyroxylin.

Pyroxylin was one of the first plastics developed and has been historically significant in applications such as photographic films, coatings, and various plastic products. Its properties include a degree of transparency, flexibility, and the ability to be dissolved in certain solvents, making it quite versatile.

The other options do not contain cellulose nitrate as their base. Polyester is a different class of polymers derived from esterification reactions, rubber is a natural or synthetic elastic substance, and polyvinyl chloride (PVC) is a widely used synthetic plastic polymer made from the polymerization of vinyl chloride monomers. Each of these materials has distinct chemical structures and properties that set them apart from cellulose nitrate and its derivatives.