(C8H8)n1 (C4H6)n2 (C3H3N)n3
ABS is a terpolymer, consisting of acrylonitrile, 1,3-butadiene and styrene (see structural formula). The amount of the individual components can vary. Production is made by means of copolymerization or graft polymerization.
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The three glass transitions, which are not equally well visible for all ABS types, are typical for acrylonitrile-butadiene-styrene copolymer (ABS). Sometimes, only the Temperatura di transizione vetrosaLa transizione vetrosa è una delle più importanti proprietà chimico-fisiche dei materiali amorfi e semi-cristallini, come, ad esempio, vetri, metalli (amorfi), polimeri, ingredienti farmaceutici e alimentari e definisce l’intervallo di temperatura in cui le proprietà meccaniche die materiali variano da duro e fragile a più morbido, malleabile o gommoso.glass transition at 100 to 105°C can be seen.
The first glass transition in the 2nd heating (red curve) with a temperature of approx. -84°C can be attributed to the polybutadiene component. The second glass transition at 106°C (2nd heating) can be attributed to the polystyrene component. In contrast to the 1st heating (blue), the glass transition in the 2nd heating shows a RelaxationWhen a constant strain is applied to a rubber compound, the force necessary to maintain that strain is not constant but decreases with time; this behavior is known as stress relaxation. The process responsible for stress relaxation can be physical or chemical, and under normal conditions, both will occur at the same time. relaxation peak, indicating that the cooling process in the instrument (controlled cooling between the two heatings) was slower than the cooling during production of the granulate. The last and highest glass transition at 118°C (1st heating) is dependent on the acrylonitrile component and – as can be seen in the enlarged scaling – overlaps with a peak in this case.