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plastics :checkered_flag: - Coggle Diagram
plastics :checkered_flag:
origin and transformations
natural plastics: are obtained directly from vegetables (cellulouse, latex)
synthetic plastics: are made from petroleum carbon and natural gas, most of the plastics belong to this group.
the transformation of this materials is called polymerisation
properities of plastics
strenght, elasticity, rigidity and felxibility
mechanical: maleability, ductility,mechanical resisteance
acoustic: acoustic insulation
electrical: electrical insulation
thermal: thermal insulation
other properities: low density, impermeability
ecological properities
chemical recycling
mechanical recycling
separation and crushing, floating, agglutination
energetic recycling
classification of plastics
thermoplastics
polyvinyl chloride, polystirene, polythene, polypropilene, polymethyl methacrylate, teflon, cellophan, nylon
thermostable plastics
polyurethane, phenolic reisns, melanine phormaldehyde,polyester resins
elastomers
natural rubber, synthetic rubber, neoprene
formation thechniques
extrusion
lamination
vacuum forming
moudling
shaping and finishing techniques
cutting
cutter, scissors, steel bit, freetsaw, jig saw, power press, hot metal thread trimmer
perforating
trimming and filling
joining plastics
temporary joints
machanical fasteners
nut and bolt, standard screw, double ended screew
permanent joins
adhesives
soldering
