Of all polyamides, polyamide 12 absorbs the least amount of water. The higher the ration of -CH2 groups to -CONH- groups, the lower the water absorption and the better the dimensional accuracy. PA12 features a lower stability and hardness than PA6 und PA6.6.
|DSC 204 F1 Phoenix®
|Al, pierced lid
|N2 (50 ml/min)
In this measurement, evaporation of water occurred at 94°C (peak temperature 1st heating, blue). The shift in the position of 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 in the 2nd heating (red, Tg of 43°C – midpoint with a Δcp value of 0.11 J/(g·K)) after water evaporation was smaller than that on page 95. The cooling rate selected in the experiment (in this case 10 K/min) was lower than the cooling rates polymer granulates generally experience during production. Therefore, the amorphous content of the sample was lower in the 2nd heating. This thesis is confirmed by the relatively high step height (Δcp) of the glass transition in the 1st heating (blue) as well as the EsotermicoUna transizione o reazione è esotermica se il materiale genera calore exothermal Post Crystallization (Cold Crystallization)The post crystallization of semi-crystalline plastics occurs primarily at elevated temperatures and increased molecular mobility above the glass transition.post-crystallization (peak temperature: 159°C, crystallization enthalpy: 2.2 J/g) that occurred immediately prior to melting.
The endothermal melting effect at 178°C (peak temperature, 2nd heating) exhibited a melting enthalpy of approx. 34 J/g.