Cited by 59Polymer crystallization and propertiesBlock Copolymer Self-AssemblySolidification and crystal growth phenomena

Nucleation and Isothermal Crystallization of the Polyethylene Block within Diblock Copolymers Containing Polystyrene and Poly(ethylene-alt-propylene)

Lorenzo, A. T., Arnal, M. L., Müller, A. J., Boschetti-de-Fierro, A., Abetz, V.·2007·Macromolecules

Abstract

The crystallization kinetics of the polyethylene block within polyethylene- b -polystyrene (PE- b -PS) and polyethylene- b -poly(ethylene- alt -propylene) (PE- b -PEP) diblock copolymers has been investigated in a wide composition range by differential scanning calorimetry (DSC) and compared to an equivalent homopolymer. The morphology of the copolymers in the melt and its changes after crystallization were explored by small-angle X-ray scattering (SAXS) experiments. SAXS experiments demonstrated that PE- b -PS formed microdomain ordered structures in the melt. On the basis of the lamellar morphology that was developed by PE- b -PEP (demonstrated by transmission electron microscopy, TEM) regardless of composition, it was deduced that these diblocks crystallize from either a homogeneous or a weakly segregated melt. Also, the effects of the neighboring block on thermal fractionation of the PE block were obtained by successive self-nucleation and annealing (SSA). Classical kinetics theories of polymer nucleation and crystallization were applied to DSC overall isothermal crystallization data. The energetic parameters obtained allow us to quantitatively estimate the increase in the energy barrier for crystallization of the PE block, caused by the covalently bonded PEP and PS block as compared to homo-PE. Also, the Lauritzen and Hoffman theory was applied to DSC isothermal crystallization of previously self-nucleated PE (where crystal growth is the dominant factor), and the contributions of nucleation and growth were estimated. Using this novel approach, we demonstrate that the nucleation process is the rate-determining step in the crystallization behavior of highly confined PE- b -PS diblock copolymers, results that were corroborated by the low Avrami index values found in these diblock copolymers. Similar trends were obtained by applying polymer nucleation theories. In the case of PE- b -PEP diblock copolymers, the energy barrier associated with nucleation and growth increases as the PEP content within the copolymers increases. The PEP block acts as a diluent for the PE block crystallization in view of the miscibility between the blocks.

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Crossref · 10.1021/ma070252l

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  • In weakly segregated systems (low χN values, T_ODT > Tc > Tg), there is little morphological restriction for crystallization, allowing a break out from the ordered melt structure, so crystallization determines the final structure, usually forming crystalline lamellae and erasing the previous melt structure.

    “In this case, there is little morphological restriction for the crystallization process, which allows a break out from the ordered melt structure, therefore the crystallization determines the final structure, usually crystalline lamellae are formed, erasing the previous structure of the melt [ 102 , 103 , 109 , 121 , 125 , 150-153 , 160-171 ].”

    From Fractionated crystallization in semicrystalline polymers (2021) · cites this paper as [109]

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Authors
Lorenzo, A. T., Arnal, M. L., Müller, A. J., Boschetti-de-Fierro, A., & Abetz, V.
Affiliations
  • Universidad Simón Bolívar (VE)
  • Grupo de Polímeros USB, Departamento de Ciencia de los Materiales, Universidad Simón Bolívar, Apartado 89000, Caracas 1080-A, Venezuela, and Institut für Polymerforschung, GKSS-Forschungszentrum Geesthacht GmbH, 21502 Geesthacht, Germany
Corresponding author
Müller, A. J.
Venue
Macromolecules
Published
2007-06-13
Volume
40
Issue
14
Pages
5023-5037
ISSN
  • 0024-9297 (ISSN-L)
  • 1520-5835
OpenAlex
W2043276570
Cited by
59
References
62
Citations by year
2026: 1 · 2025: 2 · 2024: 2 · 2023: 1 · 2022: 3 · 2021: 3 · 2020: 2 · 2019: 1 · 2018: 2 · 2017: 1 · 2016: 3 · 2015: 8 · 2014: 4 · 2013: 3 · 2012: 3
FWCI
4.66
Type
journal article
Language
en
Open access
closed
Locations
  • Macromolecules (publishedVersion)
  • Desy publication database (The Deutsches Elektronen-Synchrotron) (submittedVersion)
Topics
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
  • Physical Sciences › Materials Science › Materials Chemistry › Block Copolymer Self-Assembly
  • Physical Sciences › Materials Science › Materials Chemistry › Solidification and crystal growth phenomena
Keywords
poly(ethylene-alt-propylene), isothermal crystallization kinetics, nucleation, lamellar morphology, microdomains, Lauritzen-Hoffman theory, Avrami exponent, diluent effects, melt morphology

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