TY - JOUR
T1 - Nonisothermal Crystallization and Melting Behavior of Syndiotactic Polypropylenes of Different Microstructure
AU - Vanegas Peña, Maria Eulalia
AU - Quijada, Raúl
AU - Serafini, Daniel
AU - B. Galland, Griselda
AU - Palza, Humberto
PY - 2008/1/1
Y1 - 2008/1/1
N2 - Syndiotactic polypropylenes and their copolymers with 1-olefins were synthesized
using two metallocene/MAO catalytic systems, and the effect of the different microstructures on nonisothermal crystallization and subsequent melting was studied.
Using differential scanning calorimetry (DSC) it was observed that samples with lower
content of defects showed crystallization on cooling from the melt, and a double melting peak in the subsequent heating scan, the latter associated with melt, recrystallization and remelt processes that it was confirmed by its nonreversing exothermic process found by means of temperature modulated DSC (MDSC). However, polymers with high amount of defects showed cold crystallization on heating followed by a melting process, that it was observed by MDSC. Wide angle X-ray diffraction was used for characterizing the changes of crystalline forms in relationship with crystallization process.
AB - Syndiotactic polypropylenes and their copolymers with 1-olefins were synthesized
using two metallocene/MAO catalytic systems, and the effect of the different microstructures on nonisothermal crystallization and subsequent melting was studied.
Using differential scanning calorimetry (DSC) it was observed that samples with lower
content of defects showed crystallization on cooling from the melt, and a double melting peak in the subsequent heating scan, the latter associated with melt, recrystallization and remelt processes that it was confirmed by its nonreversing exothermic process found by means of temperature modulated DSC (MDSC). However, polymers with high amount of defects showed cold crystallization on heating followed by a melting process, that it was observed by MDSC. Wide angle X-ray diffraction was used for characterizing the changes of crystalline forms in relationship with crystallization process.
KW - Cold crystallization; Melting behavior; Structure property relations; Syndiotactic polypropylene; Thermal properties
KW - Cold crystallization; Melting behavior; Structure property relations; Syndiotactic polypropylene; Thermal properties
UR - https://onlinelibrary.wiley.com/doi/10.1002/polb.21416
M3 - Artículo
SN - 2642-4169
JO - Polymer
JF - Polymer
ER -