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  • TAIXING HONGYE STEEL WIRE MANUFACTURING CO.,LTD

  •  [Jiangsu,China]
  • Business Type:Manufacturer
  • Main Mark: Africa , Asia , East Europe , North Europe , Other Markets , West Europe , Americas , Caribbean , Europe , Middle East , Oceania , Worldwide
  • Exporter:21% - 30%
  • Certs:ISO9001, CE, EMC
TAIXING HONGYE STEEL WIRE MANUFACTURING CO.,LTD

TAIXING HONGYE STEEL WIRE MANUFACTURING CO.,LTD

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Home > Video > Video Display > POLYMERS - Engineering Materials
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POLYMERS - Engineering Materials

A polymer has a repeating structure, usually based on a
carbon backbone. The repeating structure results in large
chainlike molecules. In each polymer molecule, the atoms are bound together by covalent bonds.
Polymer: large molecules made up of many monomers 
Monomer: simpler substance of which polymer is made 
Covalent Chain Configurations and Strength
Linear Polymers: Polyethylene, polyvinyl chloride PVC, polystyrene, polymethyl methacrylate plexiglass, nylon, fluorocarbons
Branched Polymers: Many elastomers or polymeric rubbers
Cross-linked Polymers: Many elastomers or polymeric rubbers are cross-linked vulcanization process most thermosetting polymers
Network Polymers: Epoxies, phenol-formaldehydes.
Physical Properties of Polymers
Composed of very large molecules
Low modulus of elasticity 
Low tensile and compressive strengths
Can be crystalline or semi-crystalline structure
Deformation is very sensitive to temperature
Low thermal and electrical conductivity
Some polymers Creep at room temperatures
Low temperatures make plastics brittle
Plastic deformation
Classification of Polymers
Thermoplastics
Soften when heated and harden when cooled
Varying degree of ductility
Can be  recycled
Can not withstand high temperatures

Thermosets
Become permanently hard after the initial heating-cooling cycle
Brittle      
Can not be recycled
Can withstand high temperatures
Industrially Important Thermoplastics

About 85% of the world plastics consumption consists of  four polymers. These polymers are produced in high volume at very low cost. They are all thermoplastics.

Polyethylene PE    electrical wire insulation, flexible  tubing, squeeze bottles 
 Polypropylene PP carpet fibers, ropes, liquid containers cups, buckets, tanks, pipes 
 Polystyrene PS    packaging foams, egg cartons, lighting panels, electrical appliance components 
 Polyvinyl chloride   PVC   bottles, hoses, pipes, valves, electrical wire  insulation, toys, raincoats 
Polymer Processing Methods
Polymers are formed by many low temperature processes. 

Extrusion 
Film Blowing
Injection Molding 
Blow Molding
Compression Molding
Reaction Injection Molding
Extrusion
The polymer is heated to the liquid state and forced through a die under pressure resulting in an endless product of constant cross section. 60% of polymers are prepared in this way. 
Examples: tubing, pipes, window frames, sheet, insulated wire. 
Crosslinking is initiated by heat, light, or the addition of chemicals.                                                                 
Crosslinking makes elastomers reversibly stretchable for small deformations. When stretched, the polymer chains become elongated and ordered along the deformation direction. When no longer stretched, the chains randomize again. The crosslinks guide the elastomer back to its original shape.
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