Parks made all kinds of objects with Paxsin: combs, pens, buttons and jewelry patterns. However, Parks is not very business-conscious. He lost money in his business venture. In the 20th century, people began to explore new uses of plastics. Almost everything in the house can be made of some kind of plastic.
From 65438 to 0909, phenolic plastics were synthesized for the first time in Baekeland, USA, and their appearance laid the foundation for the invention and production of various plastics. Due to the development of petrochemical industry in World War II, the raw material of plastics replaced coal with oil, and the plastic manufacturing industry also developed rapidly.
Molecular structure:
The first is linear structure, and the polymer compound with this structure is called linear polymer compound; The second is the bulk structure, and the polymer compound with this structure is called bulk polymer compound. Some polymers have branched chains, which are called branched polymers and belong to linear structure.
Two different structures show two opposite properties. Linear structure, melting by heating, less hardness and brittleness. The body structure is hard and brittle. There are two kinds of polymers in plastics, one is thermoplastic made of linear polymer, and the other is thermosetting plastic made of bulk polymer.