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On the morphology of polyethylene crystallised from a sheared melt

On the morphology of polyethylene crystallised from a sheared melt
On the morphology of polyethylene crystallised from a sheared melt
The morphology of linear polyethylene, crystallized from a sheared melt in the form of shish-kebabs, has been investigated by transmission electron microscopy following permanganic etching. The microstructure of lamellae crystallized transversely on a central linear thread changes systematically with crystallization temperature and shear rate. Higher strain rate produces more and longer filaments and aligns lamellar normals along their rows. At lower strain rate, lamellar habits resemble, but differ from, those characteristic of quiescent growth. Fold surfaces that are inclined to the chain axis c at lower shear rates become normal to c with higher shear, thereby adopting a state of higher energy. It is inferred from this and the high crystallization temperatures that their crystallization was not strain-free. The separation of adjacent lamellae and its decrease at higher strain rate are consistent with pressure from molecular cilia emerging from fold surfaces, in a similar way to the basic cause of lamellar divergence in spherulites.
0032-3861
4197-4202
Hosier, I.L.
6a44329e-b742-44de-afa7-073f80a78e26
Bassett, D.C.
68fc1014-39cf-4f20-8d60-ab0545a02d19
Moneva, I.T.
45eed995-8823-4315-850e-80ee22d61f80
Hosier, I.L.
6a44329e-b742-44de-afa7-073f80a78e26
Bassett, D.C.
68fc1014-39cf-4f20-8d60-ab0545a02d19
Moneva, I.T.
45eed995-8823-4315-850e-80ee22d61f80

Hosier, I.L., Bassett, D.C. and Moneva, I.T. (1995) On the morphology of polyethylene crystallised from a sheared melt. Polymer, 36 (22), 4197-4202.

Record type: Article

Abstract

The morphology of linear polyethylene, crystallized from a sheared melt in the form of shish-kebabs, has been investigated by transmission electron microscopy following permanganic etching. The microstructure of lamellae crystallized transversely on a central linear thread changes systematically with crystallization temperature and shear rate. Higher strain rate produces more and longer filaments and aligns lamellar normals along their rows. At lower strain rate, lamellar habits resemble, but differ from, those characteristic of quiescent growth. Fold surfaces that are inclined to the chain axis c at lower shear rates become normal to c with higher shear, thereby adopting a state of higher energy. It is inferred from this and the high crystallization temperatures that their crystallization was not strain-free. The separation of adjacent lamellae and its decrease at higher strain rate are consistent with pressure from molecular cilia emerging from fold surfaces, in a similar way to the basic cause of lamellar divergence in spherulites.

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Published date: October 1995
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 265730
URI: http://eprints.soton.ac.uk/id/eprint/265730
ISSN: 0032-3861
PURE UUID: 9b6003e7-8135-49bf-820a-2281319af09c
ORCID for I.L. Hosier: ORCID iD orcid.org/0000-0003-4365-9385

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Date deposited: 16 May 2008 13:20
Last modified: 25 Sep 2020 01:35

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