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- W2002034767 abstract "Abstract This study aims to assess the relative influence of microstructure, molar mass and morphology on the local α relaxation of isotactic polypropylene (iPP). For that purpose, three families of samples have been prepared. The Ziegler–Natta type provides a wide molar mass range where both the isotactic average length ( n 1 ) and the nature of the isotacticity interruptions change according to chain size. The metallocene type allows to analyse also the samples in which molar mass and n 1 are related but the nature of the defects stays the same. Finally, three propylene-like EP copolymers (containing only isolated ethylene units) have been synthesised via metallocene catalysis in order to study samples which combine both relatively high molar masses and short n 1 . Among the factors considered, microstructure and n 1 in particular have been found to drive mainly the quality of the α relaxation. Concerning the intensity, it has been observed that some microstructural features related to n 1 must be fulfilled for this dynamics to take place. Provided this requirements are met, the intensity of the α relaxation depends on the final crystalline distribution resulting from a given molar mass, microstructure and processing conditions." @default.
- W2002034767 created "2016-06-24" @default.
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- W2002034767 date "2007-01-01" @default.
- W2002034767 modified "2023-09-27" @default.
- W2002034767 title "The role of microstructure, molar mass and morphology on local relaxations in isotactic polypropylene. The α relaxation" @default.
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- W2002034767 doi "https://doi.org/10.1016/j.polymer.2006.11.034" @default.
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