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18.09.18 Flashcards

(9 cards)

1
Q

Welche 2 Strukturen können Kunststoffe bei Abkühlung annehmen?

A
  • ihre amorphe Schmelzstruktur behalten

- kristiline,geordnete Bereiche ausbilden

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2
Q

Nenne 4 typische amorphe Thermoplaste

A

Polyvinylchlorid (PVC)
Polycarbonat (PC)
Polymethylmethacrylat (PMMA)
Polystyrol (PS)

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3
Q

Wo liegt der Gebrauchsbereich amorpher Thermoplaste?

A

Unterhalb des Erweichungsbereiches (also im spröden Glaszustand)

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4
Q

Was ist die Glasübergangstemperatur?

A

Temperatur im Erweichungsbereich, ab der das Material von einem glasförmigen in einen gummiähnlichen Zustand wechselt.

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5
Q

Nenne 2 limitierende Faktoren, die eine vollständige Kristallisation eines teilkristallinen Thermoplasten verhindern

A
  • Eingeschränkte Kettenmobilität durch Verschraubungen

- Unterschiedliche Länge der Polymerketten

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6
Q

Was gibt der Kristallisationsgrad an?

A

Den Anteil des kristallinen Volumens im erstarrten Material.

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7
Q

Nenne drei typische teilkristalline Thermoplaste

A

Polyethylen (PE)
Polypropoylen (PP)
Polyamid (PA)

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8
Q

Welchen Grad der Kristallinität können PE und PET erreichen?

A

PE 80 Vol.-%

PET 5 Vol.-%

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9
Q

Welchen Grad der Kristallinität können PE und PET erreichen?

A

PE 80 Vol.-%

PET 5 Vol.-%

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