TY - JOUR
T1 - Fast cooling of (non)-nucleated virgin and recycled poly(propylenes)
T2 - Effect of processing conditions on structural and mechanical properties
AU - Luijsterburg, B.J.
AU - de Kort, G.W.
AU - van Drongelen, Martin
AU - Govaert, L.E.
AU - Goossens, J.G.P.
PY - 2015
Y1 - 2015
N2 - In this study, the effect of processing parameters, i.e., the cooling rate and pressure, on the structure-property relationships for nucleated and non-nucleated i-PP from virgin and recycled sources was investigated. Special attention was given to the brittle-to-ductile transition of nucleated i-PP from plastic packaging waste. Differential fast scanning calorimetry and dilatometry were used to mimic industrial process conditions. From the calorimetric experiments, it was observed that under ambient pressure the mesomorphic phase was formed upon fast cooling, which was confirmed by WAXD analysis. The dilatometry results showed that by applying pressure also γ-phase crystals are formed. Nucleated samples showed an increased tendency for the γ-phase formation and a decreased tendency for mesomorphic phase formation. Up to now, recycled i-PP showed a brittle behavior, but this study showed that by applying a sufficiently high cooling rate, the yield stress can be reduced and a stabilization of the deformation can be obtained leading to a ductile behavior for recycled i-PP.
AB - In this study, the effect of processing parameters, i.e., the cooling rate and pressure, on the structure-property relationships for nucleated and non-nucleated i-PP from virgin and recycled sources was investigated. Special attention was given to the brittle-to-ductile transition of nucleated i-PP from plastic packaging waste. Differential fast scanning calorimetry and dilatometry were used to mimic industrial process conditions. From the calorimetric experiments, it was observed that under ambient pressure the mesomorphic phase was formed upon fast cooling, which was confirmed by WAXD analysis. The dilatometry results showed that by applying pressure also γ-phase crystals are formed. Nucleated samples showed an increased tendency for the γ-phase formation and a decreased tendency for mesomorphic phase formation. Up to now, recycled i-PP showed a brittle behavior, but this study showed that by applying a sufficiently high cooling rate, the yield stress can be reduced and a stabilization of the deformation can be obtained leading to a ductile behavior for recycled i-PP.
U2 - 10.1016/j.tca.2014.09.025
DO - 10.1016/j.tca.2014.09.025
M3 - Article
SN - 0040-6031
VL - 603
SP - 94
EP - 102
JO - Thermochimica acta
JF - Thermochimica acta
ER -