Explanation
Preliminary polymerization of monomer. After treatment, monomer forms prepolymer. In three-dimensional polycondensation of thermosetting resin, the polymerization reaction terminated before gel point is. The obtained polymer is fusible, and can be casting into a molding mold and further polymerization to obtain a molded structural part. It can be used to avoid voids or cracks formed by volume shrinkage of polymer during polymerization molding. It is also used in the synthesis of some thermoplastic resin to control the reaction rate and product size.
Classification
Organic polymer materials -> Polymer Science -> Polymer Chemistry