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来源:百度知道 编辑:UC知道 时间:2024/09/20 11:37:31
最好有5000字。

1, thermoplastic mode

Refers to a definite temperature can soften and van turn melt flow cooling after a certain shape can cure plastic. This process can be repeated several times.
(1) substance (structure) : line type with a chain of polymers.
(2) advantages: good physical and mechanical properties, easy molding.
Faults: general (3) are compared and rigid heat-resistance (a few products except).
(4) breed: PE polyethylene, PP polypropylene, PS polystyrene.

2, thermosetting plastic mould

Refers to the resin heating process in chemistry occurs, the anniversary of linear polymer into shape, then heated polymer structure, also not melt in organic solvents, if the heating temperature is exorbitant, can carbonized.
(1) substance (structure) : resin for functional molecules.
(2) advantage: high resistance, good stability, price. Size
(3) : mechanical properties are poorer, increase.
(4) breed: PF phenolic, UF urea-fo