Plastic is a polymer resin made of petroleum or natural gas through synthetic reaction. Polymer resin is a polymer polymerized from monomer compounds, and its molecular weight can reach thousands or even millions.
Second, the development of plastics.
1,19 In 1950s, British photographer Alexander Parks mixed collodion with camphor to obtain "Paxsin" flexible and hard material, the earliest plastic;
2. 1868, American printer Wesley heath improved the manufacturing process and changed "paxson" into "celluloid";
3, 1907, Leo, Belgium, USA.
Backlander used the reaction of phenol and formaldehyde to obtain high-temperature resistant phenolic plastic, which was patented in 1909.
4. 1930, the outstanding American scientist carothers and his research team developed nylon. The innovation of textile materials and the major breakthrough of synthetic fiber industry are milestones in polymer chemistry.
5. 1938, DuPont officially announced the birth of the world's first synthetic fiber;
5. 1940, polyester fiber-polyester was synthesized in winfield, England.
Third, the characteristics of plastics.
1, plastics can be divided into thermosetting and thermoplastic, the former can't be used plastic, and the latter can be produced repeatedly;
2. The structure of polymer includes linear structure and block structure.