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Samenvatting H7 - Materialen - UGent - Ind. Ing - K. Ragaert $4.81
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Samenvatting H7 - Materialen - UGent - Ind. Ing - K. Ragaert

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Samenvatting H7 - Materialen - UGent - Ind. Ing - K. Ragaert

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  • Hoofdstuk 7
  • June 24, 2021
  • 20
  • 2020/2021
  • Summary
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Hoofdstuk 7
structuur-eigenschaprelaties in
polymeren
Inleiding
focus op thermoplastische polymeren

invloed op micro- en macrostructuur op eigenschappen

thermoplastische polymeren: enkelvoudige ketens die verwerken tot een
viskeuze massa bij voldoende opwarmen

indeling van themoplastische polymeren




herhaling amorf vs semi-kristallijn

100% amorf A% amorf + 100A% kristallijn




Hoofdstuk 7 1

, concept check

thermoplast, rubber of thermoharder gaat over de mate van
crosslinking/vernetting tussen de ketens (geen/laag/hoog)

binnen de categorie thermoplast: amorf of semi-kristallijn gaat over hoe de
ketens zich rangschikken in de vaste toestand

in de vloeibare toestand(L), zijn alle thermoplasten amorf

bij afkoelen zullen de ketens zich in al dan niet ordenen tot een deel
kristallijne gebieden in de (micro)structuur

structuur

elke thermoplast heeft een amorf deel van de structuur

sommige thermoplasten hebben ook een kristallijn deel → semi-
kristallijne polymeren


7.1 Faseovergangen in thermoplasten
7.1.1 Amorfe fase
Amorfe fase: temperaturen




Hoofdstuk 7 2

, Amorfe polymeren: E i.f.v. T




Amorfe polymeren: soortelijk volume i.f.v. T

Bij T > T_sec: lichte toename vrij
volume
⇒ beperkte
bewegingsmogelijkheid in
glastoestand
⇒ polymeer taaier




Hoofdstuk 7 3

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