different structure

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Composition

Plastic is a major component of synthetic resin. Resin this term was originally developed by plants and animals secrete lipid and its name, such as rosin, shellac, the resin is not yet and various additives mixed polymer. Resin accounted for about 40% of the total weight of the ~ 100% plastic. Plastic basic performance mainly depends on the nature of resin additive, but also plays an important role in. Some of the plastic is basically composed of synthetic resin composition, with no or less additive, such as glass,Water slide polystyrene. The so-called plastic, in fact it is a kind of synthetic resin, the shape and natural resin of pine resin similar to, but because through chemical means of artificial synthesis, and is called the plastic.

Two kinds of different structure, show two kinds of opposite properties. Linear structure ( including structure of amylopectin ) polymers with independent molecules exist, therefore has elasticity, plasticity, in a solvent to dissolve, heating to melt, the hardness and brittleness of smaller features. Body structure of polymer with no independent large molecules exist, there is no elasticity and plasticity, can't dissolve and melt, it can be swelling, hardness and brittleness. Plastic two kinds of structure of the polymer are, by linear polymer made from thermoplastic polymer made by size, is a thermosetting plastic.

Table 1.1 comparison table for plastic raw materials, 1 to 8 for the pan with plastic, the 9.10 Xiang Jie in two between. Commonly known as PP, HDPE, LDPE, PVC and PS for the five pan with plastic.
The main characteristics of plastic
The majority of plastic light, chemical stability, no corrosion; the good impact resistance; and with good transparency and abrasion resistance;Plastic wood the good insulation, low thermal conductivity; the general shape, color is good, the processing cost is low; poor most heat-resistant plastic, thermal expansion rate, to burn; the poor dimensional stability, easy deformation; and most plastics low temperature difference, low temperature brittle; - easy to aging; with some plastic easy to dissolve in solvents.

Plastics can be divided into thermosetting and thermoplastic two categories, the former cannot be reshaped using, the latter can repeat production.

Plastic polymer structure
There are two basic types : the first is a linear structure, with the structure of the polymeric compounds called linear polymer; second is the integrated structure, with the structure of the polymer compound called type polymer compound. Some polymer having branched, called branched polymer, belonging to the linear structure. Although some intermolecular cross-linking polymer, crosslinking but less, called the reticular structure, which belongs to the body structure.

Two kinds of different structure, show two kinds of opposite properties. Linear structure ( including structure of amylopectin ) polymers with independent molecules exist, therefore has elasticity, plasticity, in a solvent to dissolve, heating to melt,Playground equipment the hardness and brittleness of smaller features. Body structure of polymer with no independent macromolecules exists, so there is no elasticity and plasticity, can't dissolve and melt, it can be swelling, hardness and brittleness. Plastic two kinds of structure of the polymer are, by linear polymer made from thermoplastic polymer made by size, is a thermosetting plastic.

Plastics and other materials
' 1 ' resistance to chemical erosion of plastic building materials ' 2 ' with a gloss, partially transparent or translucent
' 3 ' for the most good insulator
' 4 ' light weight and firm
' 5 ' easy processing can be produced in large quantities, cheap price
' 6 ' wide use, effectiveness, easy coloring, partial high temperature
Plastics are also divided into general plastics and engineering plastics, mainly is the extensive use of definition, such as PE, PP, cheap, available in a variety of different types of machine production. Engineering plastics are more expensive, but raw material stability and physical properties are better, in general, at the same time has rigidity and toughness of two kinds of characteristics.

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