caa a22 4500 605466505 CHVBK 20210128100307.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s00397-014-0829-4 doi (NATIONALLICENCE)springer-10.1007/s00397-014-0829-4 Flow-induced crystallization of polypropylenes in capillary flow [Elektronische Daten] [Maziar Derakhshandeh, Bashar Jazrawi, George Hatzikiriakos, Antonios Doufas, Savvas Hatzikiriakos] In this paper, the flow-induced crystallization (FIC) behavior of various polypropylenes with different molecular characteristics was investigated using a capillary rheometer. The Cogswell analysis was applied on the capillary data to obtain the apparent extensional strain rate and strain as well as the apparent extensional viscosity. The extensional viscosity obtained using this method was in good agreement with the zero shear viscosity obtained using a cone-and-plate rotational rheometer (Anton Paar MCR-502). Extensional flow parameters did not influence crystallization kinetics in the capillary die. FIC was found to depend strongly on the length-to-diameter (L/D) ratio of the capillary die that is directly related to the residence time. It was also found that the crystallization kinetics were enhanced with increasing molecular weight, indicating the importance of high-end tail of molecular weight distribution (MWD) on FIC. Finally, temperature impacted the FIC behavior significantly since it alters the activation energy needed for the formation of macroscopic structures. Springer-Verlag Berlin Heidelberg, 2014 Capillary rheometer nationallicence Contraction flow nationallicence Crystallization nationallicence Flow-induced orientation nationallicence Derakhshandeh Maziar Department of Chemical and Biological Engineering, The University British Columbia, Vancouver, BC, Canada aut Jazrawi Bashar Department of Chemical and Biological Engineering, The University British Columbia, Vancouver, BC, Canada aut Hatzikiriakos George Department of Mechanical Engineering, The University British Columbia, Vancouver, BC, Canada aut Doufas Antonios ExxonMobil Chemical Company, Baytown, TX, USA aut Hatzikiriakos Savvas Department of Chemical and Biological Engineering, The University British Columbia, Vancouver, BC, Canada aut Rheologica Acta Springer Berlin Heidelberg 54/3(2015-03-01), 207-221 0035-4511 54:3<207 2015 54 397 https://doi.org/10.1007/s00397-014-0829-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-014-0829-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Derakhshandeh Maziar Department of Chemical and Biological Engineering, The University British Columbia, Vancouver, BC, Canada aut NATIONALLICENCE 700 1- Jazrawi Bashar Department of Chemical and Biological Engineering, The University British Columbia, Vancouver, BC, Canada aut NATIONALLICENCE 700 1- Hatzikiriakos George Department of Mechanical Engineering, The University British Columbia, Vancouver, BC, Canada aut NATIONALLICENCE 700 1- Doufas Antonios ExxonMobil Chemical Company, Baytown, TX, USA aut NATIONALLICENCE 700 1- Hatzikiriakos Savvas Department of Chemical and Biological Engineering, The University British Columbia, Vancouver, BC, Canada aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/3(2015-03-01), 207-221 0035-4511 54:3<207 2015 54 397