1 Most plastics are light, chemically stable, and will not rust; 2 good impact resistance; 3 good transparency and wear resistance; 4 good insulation, low thermal conductivity; 5 general formability, coloration Good, low processing cost; 6 most plastics have poor heat resistance, large thermal expansion rate, easy to burn; 7 dimensional stability is poor, easy to deform; 8 most plastics have poor low temperature resistance, become brittle at low temperature; 9 easy to age; 10 some plastics are easy Soluble in solvent.
Plastics can be distinguished by thermosetting and thermoplasticity. The former cannot be reshaped and the latter can be repeatedly produced.
There are basically two types of plastic polymer structures: the first one is a linear structure, the polymer compound having such a structure is called a linear polymer compound, and the second is a bulk structure, and a polymer compound having such a structure It is called a bulk polymer compound. Some polymers have a branch, called a branched polymer, and belong to a linear structure. Some polymers have cross-linking between molecules, but cross-linking is less. It is called a network structure and belongs to a body structure.
Two different structures exhibit two opposite properties. The linear structure (including the branched structure) polymer has the characteristics of elasticity, plasticity, solubility in a solvent, melting by heating, and low hardness and brittleness due to the existence of independent molecules. Since the bulk structure polymer does not have independent macromolecules, it has no elasticity and plasticity, cannot be dissolved and melted, and can only swell, and has high hardness and brittleness. Plastics are made of two kinds of polymers. Thermoplastics are made of linear polymers, and thermosetting plastics are made of bulk polymers.
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