Crystalline Structures, Melting, and Crystallization of Linear Polyethylene in Cylindrical Nanopores
Abstract
The crystalline structures associated with melting and crystallization behaviors of monodisperse linear polyethylene confined in cylindrical nanopores were investigated by X-ray diffraction and differential scanning calorimetry. The crystalline structures, melting, and crystallization behaviors of PE under the imposed cylindrical confinement were noticeably different from those of the bulk state. The isothermal crystallization experiments showed that the overall crystallization of polyethylene in cylindrical nanopores was dominated by the nucleation rather than the growth of crystallites. The c - and a -axes of orthorhombic PE crystals developed in nanoporous alumina were preferentially oriented perpendicular to the long axis of cylindrical nanopore while the b -axis was parallel to the pore axis. The melting temperature of polyethylene in the nanopores was substantially depressed, and it was analyzed with the Thomson−Gibbs equation. The crystallinity of linear polyethylene in cylindrical nanopores was less than 50%, whereas the bulk value was 71.6%.
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The n values of PE dropped from 2.4 in bulk to 1.5-1.9 upon confinement in AAO with a diameter ranging from 15 to 100 nm.
“The n values of PE dropped from 2.4 (bulk) to 1.5 ∼ 1.9 upon confinement in AAO with a diameter ranging from 15 to 100 nm.”
From Fractionated crystallization in semicrystalline polymers (2021) · cites this paper as [284]
Since n = nn + ngd, the n ≈ 2 was interpreted by sporadic nucleation and 1-dimensional crystal growth along the AAO nanocylinders.
“Since n = n n + n gd , the n ≈ 2 was interpreted by sporadic nucleation and 1-dimensional crystal growth along the AAO nanocylinders.[ 268 , 284 ]”
From Fractionated crystallization in semicrystalline polymers (2021) · cites this paper as [284]
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References 46 · Cited by 190
- Authors
- Shin, K., Woo, E., Jeong, Y. G., Kim, C., Huh, J., & Kim, K.-W.
- Affiliations
- Kumoh National Institute of Technology (KR)
- School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea; School of Advanced Materials and Systems Engineering, Kumoh National Institute of Technology, Gumi 730-701, Republic of Korea; Hyperstructured Organic Materials Research Center and School of Materials Science and Engineering, Seoul National University, Seoul 151-742, Republic of Korea; and Pohang Accelerator Laboratory, Pohang 790-784, Republic of Korea
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2007-08-11
- Volume
- 40
- Issue
- 18
- Pages
- 6617-6623
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W1978382353
- Cited by
- 190
- References
- 46
- Citations by year
- 2026: 5 · 2025: 3 · 2024: 3 · 2023: 1 · 2022: 7 · 2021: 12 · 2020: 15 · 2019: 10 · 2018: 11 · 2017: 21 · 2016: 12 · 2015: 12 · 2014: 10 · 2013: 20 · 2012: 17
- FWCI
- 6.52
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Macromolecules (publishedVersion)
- Topics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › nanoparticles nucleation surface interactions
- Physical Sciences › Materials Science › Materials Chemistry › Crystallization and Solubility Studies
- Keywords
- linear polyethylene, cylindrical nanopores, nanoporous alumina, confined crystallization, melting temperature depression, isothermal crystallization, crystal orientation, orthorhombic structure, crystallinity
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