Crystallization in Oriented Semicrystalline Diblock Copolymers
Abstract
Crystallization in oriented diblock copolymers containing poly(ethylene) (PE) has been investigated using simultaneous small-angle and wide-angle X-ray scattering (SAXS/WAXS). The orientation of the crystallized PE stems was deduced from the orientation of peaks in the WAXS pattern with respect to those in the SAXS to be parallel to the lamellar interface for symmetric diblocks containing PE and either a rubbery or glassy amorphous block. For a symmetric diblock with a poly(vinylcyclohexane) block that is glassy at room temperature we observe diffuse scattering parallel to the meridian in the SAXS pattern that is consistent with lateral correlations between PE crystallites within the layers of semicrystalline PE. In contrast, in all the samples containing an amorphous component, PE crystallization occurred with no lateral positional correlations of crystallites. Crystallization in asymmetric diblocks with compositions f PE = 0.35 and 0.46 was also investigated. It was found that a lamellar structure is the stable solid structure and that this melts epitaxially to a hexagonal-packed cylinder structure in the f PE = 0.35 sample. For the f PE = 0.46 sample that forms a perforated layer phase in the melt, chain-folded PE stems were found to be parallel to the lamellar interface, as for the symmetric diblocks.
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In medium segregated systems (medium χN values, T_ODT > Tc > Tg), the final morphology depends on the applied thermal procedure: if the sample is cooled from the melt very fast (quenching), the morphology of the melt is maintained; otherwise, the final morphology is governed by the crystallization process.
“For these block copolymers the final morphology (i.e., the morphology of the solidified sample) depends on the applied thermal procedure: if the sample is cooled from the melt very fast, i.e., quenching, the morphology of the melt is maintained. Otherwise, the final morphology will be governed by the crystallization process [ 102 , 103 , 150-153 , 160-164 , 172 , 173 ].”
From Fractionated crystallization in semicrystalline polymers (2021) · cites this paper as [161]
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- Authors
- Hamley, I. W., Fairclough, J. P. A., Terrill, N. J., Ryan, A. J., Lipic, P. M., Bates, F. S., & Towns-Andrews, E.
- Affiliations
- University of Leeds (GB)
- University of Minnesota (US)
- Daresbury Laboratory (GB)
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 1996-01-01
- Volume
- 29
- Issue
- 27
- Pages
- 8835-8843
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W1993264549
- Cited by
- 223
- References
- 20
- Citations by year
- 2026: 1 · 2025: 2 · 2023: 1 · 2022: 5 · 2021: 2 · 2020: 1 · 2019: 1 · 2018: 3 · 2017: 8 · 2016: 1 · 2015: 7 · 2014: 8 · 2013: 8 · 2012: 13
- FWCI
- 8.75
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Macromolecules (publishedVersion)
- University of Huddersfield Repository (University of Huddersfield) (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 › Chemistry › Organic Chemistry › Advanced Polymer Synthesis and Characterization
- Keywords
- diblock copolymers, semicrystalline polymers, polyethylene, polymer crystallization, polymer orientation, lamellar phase, hexagonal cylinder phase, chain folding, lamellar interfaces
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