Tutorial: Strojírenská technologie Topic: Plasty – Plastics – types and structures Prepared by: Ing. Elena Nová Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/ je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.
Plastics – types and structures
Plastics are divided according to their inner structure into three groups: Thermoplasts Reactoplasts Elastomers
Thermoplasts can be heat formed and welded Thermoplasts become softer at higher temperatures and again harder at lower temperatures. Injection moulding:
Most known thermoplasts: Polystyren (PS). Polystyren Polyethylen (PE). Polyethylen Polyamid (PA - nylon, silon). Polyamid Polyethylentereftalát (PETP - PET). Polyethylentereftalát Polytetrafluorethylen (PTFE - teflon). Polytetrafluorethylen Polyvinylchlorid (PVC - novodur, novoplast). Polyvinylchlorid Polymetylmetakrylát (PMMA - plexisklo).
Polystyren
Reaktoplasts cannot be formed or welded at higher temperatures. After hardening they cannot be heat-formed. Most known thermosets: Bakelite. Bakelite Rubber. Rubber Epoxide, resin.
Elastomer, Rubbers, - are elastic but cannot be formed or welded at higher temperatures. Most known elastomers and elastic fibers: Elastin's - polymers based on polyurethane Elastodiens - based on polyisopreens of rubber. Elastin's - polymers based on polyurethane Elastodiens - based on polyisopreens of rubber.
Usage of plastics: Textile fibers, strings, loop piles, foils Plates, pipes, profiles, blocks Pressing and injection matters Technical resins Lightened materials
Can they be formed at higher temperature Cannot be formed or welded at higher temperature Are they elastic, but cannot be formed or welded at higher temperature Reaktoplasty Elastomery Termoplasty
vnitřní struktury pevnost tvrdý měkký tekutý rozpad teplota
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