RT info:eu-repo/semantics/article
T1 In situ polymerisation of stereospecific propylene nanocomposites blends. Optimising mechanical properties
A1 Núñez, Karina
A1 Tanasi, Paolo
A1 Asensio, Maria
A1 Herrero, Manuel
A1 Guerrero, Julia
A1 Alonso Pastor, Luis Eduardo
A1 Pastor Barajas, José María
K1 Síntesis química
K1 Polimerización
K1 Nanocompuestos
K1 In-situ polymerisation
K1 Polimerización in-situ
K1 Polypropylene
K1 Polipropileno
K1 Metallocenic catalyst
K1 Catálisis por Metalocenos
K1 Nanocomposites
K1 Nanocompuestos
K1 3303.05 Síntesis Química
AB Isotactic (iPP) and syndiotactic (sPP) polypropylene composites and their blends containing different amounts of nanosepiolite as cocatalyst support were prepared via in-situ polymerisation using different metallocene catalysts to find out improvements in the mechanical properties in comparison with traditional PP nanocomposites obtained by melt. The results showed that the amount of nanoclay significantly affects the catalytic activity of the C s-symmetry catalyst, obtaining nanocomposites with important microstructural changes: increased molecular weight and syndiotactic sections, narrower molecular weight distributions and increased crystallinity. The particular ordering of the crystalline sections of the sPP observed in the WAXS patterns was the main reason for the dramatic changes in the thermal and mechanical properties of the obtained nanocomposites. Although the nanocomposites obtained with catalyst mixtures maintained certain thermal properties of the iPP, these did not translate into improved mechanical properties due to the loss of crystallinity and the preference for the synthesis of syndiotactic configurations.
PB ELSEVIER
SN 0032-3861
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/74458
UL https://uvadoc.uva.es/handle/10324/74458
LA eng
NO Polymer, February 2022, vol. 240, n. 124480
NO Producción Científica
DS UVaDOC
RD 30-ene-2025