Cited by 82Polymer crystallization and propertiesRheology and Fluid Dynamics StudiesMaterial Dynamics and Properties

Thermorheologically complex self-seeded melts of propylene–ethylene copolymers

Sangroniz, Leire, Cavallo, Dario, Santamaria, Antxon, Müller, Alejandro J., Alamo, Rufina G.·2017·Macromolecules

Abstract

A novel approach to study self-nucleation in semicrystalline polymers is presented. Self-nucleation, i.e., the peculiar increase of recrystallization kinetics associated with a range of melting temperatures above or below the melting point, is investigated in parallel with differential scanning calorimetry (DSC) and rheological measurements, for a series of metallocene propene/ethylene random copolymers of varying comonomer content. DSC experiments revealed the exact temperature region where self-nucleation effects are detected in the various samples, while with dynamic viscoelastic results the obedience to the time–temperature superposition principle (TTS) is tested, for both self-nucleated and homogeneous melts. Self-nucleated melts do not obey to the TTS principle, contrary to fully isotropic copolymer melts. Such rheological thermocomplexity constitutes the first physical experimental evidence of the presence of melt heterogeneities, which act as self-nuclei when the melt is cooled and recrystallizes. The degree of thermorheological complexity of the different copolymers is quantified and correlated with the original crystalline content of the copolymer.

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Crossref · 10.1021/acs.macromol.6b02392

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  • It has been postulated that self-nuclei in Domain IIa can be regions in the melt where partial orientation of the chains remains, due to the survival of inter-segmental interactions that were present in the crystalline state.

    “It has been postulated that they can be regions in the melt where partial orientation of the chains remain, thanks to the survival of inter-segmental interactions that were present in the crystalline state [ 321 , 322 , 333-337 ].”

    From Fractionated crystallization in semicrystalline polymers (2021) · cites this paper as [334]

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Authors
Sangroniz, L., Cavallo, D., Santamaria, A., Müller, A. J., & Alamo, R. G.
Affiliations
  • University of the Basque Country (ES)
  • University of Genoa (IT)
  • POLYMAT and Polymer Science and Technology Department, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, 20018, Donostia-San Sebastián, Spain
  • Ikerbasque (ES)
  • Florida A&M University - Florida State University College of Engineering (US)
Corresponding author
Cavallo, Dario
Venue
Macromolecules
Published
2017-01-06
Volume
50
Issue
2
Pages
642-651
ISSN
  • 0024-9297 (ISSN-L)
  • 1520-5835
OpenAlex
W2569082314
Cited by
82
References
45
Citations by year
2026: 9 · 2025: 11 · 2024: 13 · 2023: 6 · 2022: 15 · 2021: 9 · 2020: 6 · 2019: 3 · 2018: 5 · 2017: 5
FWCI
2.97
Type
journal article
Language
en
Open access
closed
Locations
  • Macromolecules (publishedVersion)
  • CINECA IRIS Institutial Research Information System (University of Genoa) (submittedVersion)
Funders
  • Ministerio de Economía y Competitividad (MAT2014-53437-C2-P)
  • Eusko Jaurlaritza (IT586-13)
  • Euskal Herriko Unibertsitatea
  • Division of Materials Research (DMR 1607786)
Topics
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
  • Physical Sciences › Chemical Engineering › Fluid Flow and Transfer Processes › Rheology and Fluid Dynamics Studies
  • Physical Sciences › Materials Science › Materials Chemistry › Material Dynamics and Properties
Keywords
self-nucleation, semicrystalline polymers, ethylene-propylene copolymer, metallocene catalysts, random copolymers, recrystallization kinetics, thermorheological complexity, time-temperature superposition, crystallinity, polymer melts

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