Acrylonitrile-styrene-acrylate copolymer (ASA) like ABS (see previous example) is also a terpolymer of three monomer units and has similar properties, but is more weather-resistant. ASA can be referred to as SAN-Polymer when acrylic ester is evenly distributed throughout the polymer.
|DSC 204 F1 Phoenix®
|Al, pierced lid
|N2 (50 ml/min)
Two glass transitions can be seen in the above DSC curves. The first 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 can be attributed to the acrylate component and occurs in the 2nd heating at -50°C (midpoint, red curve) with a change in specific heat of 0.04 J/(g.K)). The second glass transition is due to the styrene component. The larger the 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, the more positively shifted the glass transition temperature to higher temperatures, as in this example.