The composition of plastic is a collection of many linear, elongated polymer compounds. The degree of crystallization (crystallinity) depends on the degree to which the molecules are normally aligned, and the degree of crystallization can be measured by reflection of x-rays. . The structure of organic compounds is complicated, the structure of plastics is more complicated, and the structure of molecular chains (linear, hairy, folded, spiral, etc.) changes, and the structure thereof also changes greatly depending on the forming conditions. The plastic with large crystallinity is a crystalline plastic, and the attraction between molecules is easy to interact, and becomes a strong plastic. In order to be crystallized and regularly arranged correctly, the volume becomes small, and the molding shrinkage ratio and the thermal expansion coefficient become large. Therefore, if the crystallinity is higher, the transparency is worse, but the strength is higher. Crystalline plastics have a distinct melting point (Tm). When solid, the molecules are regularly arranged, with strong strength and strong tensile force. When melting, it has larger change than volume, and it is easy to shrink after solidification. The internal stress is not easily released. The finished product is opaque, the heat dissipation during forming is slow, the shrinkage after the production of cold mold is large, and the shrinkage after the hot mold production is small. Compared with crystalline plastics, there is another kind of amorphous plastic, which has no obvious melting point. The molecules are irregularly arranged in solid state, and the volume changes little when melted. It is not easy to shrink after curing. The transparency of the finished product is good, and the temperature is higher. The yellower the color, the faster the heat dissipation during forming, and the following compares the physical properties of the two.
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