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On permanent cilia and segregation in the crystallization of binary blends of monodisperse n-alkanes

On permanent cilia and segregation in the crystallization of binary blends of monodisperse n-alkanes
On permanent cilia and segregation in the crystallization of binary blends of monodisperse n-alkanes
The isothermal crystallization kinetics and morphology have been investigated for a series of dilute binary blends using six monodisperse n-alkanes as guest in C162H326 as host. Two patterns of behaviour were observed. Guest molecules shorter than the host segregate as a separate population causing growth rates to become both reduced and non-linear. Morphologies are then noticeably less spherulitic than the host with less divergence between adjacent dominant lamellae but exhibiting no additional splaying at zero supercooling. By contrast, those blends with an n-alkane longer than the host co-crystallize (producing permanent cilia of controlled length) with a constant, but reduced, isothermal lamellar growth rate. Textures are now more spherulitic than the host, with additional splaying of an amount directly proportional to the number of permanent cilia and increasing with their length. The intercepts and slopes of plots of splaying data against supercooling are consistently related to permanent cilia plus inclined packing of initially rough lamellar surfaces and transient ciliation, respectively. The underlying causes of spherulitic growth for long molecules are thereby further confirmed and clarified.
0032-3861
307-318
Hosier, I.L
6a44329e-b742-44de-afa7-073f80a78e26
Bassett, D.C
b98f3102-f141-4242-bb77-3d46172b8de7
Hosier, I.L
6a44329e-b742-44de-afa7-073f80a78e26
Bassett, D.C
b98f3102-f141-4242-bb77-3d46172b8de7

Hosier, I.L and Bassett, D.C (2002) On permanent cilia and segregation in the crystallization of binary blends of monodisperse n-alkanes. Polymer, 43 (2), 307-318.

Record type: Article

Abstract

The isothermal crystallization kinetics and morphology have been investigated for a series of dilute binary blends using six monodisperse n-alkanes as guest in C162H326 as host. Two patterns of behaviour were observed. Guest molecules shorter than the host segregate as a separate population causing growth rates to become both reduced and non-linear. Morphologies are then noticeably less spherulitic than the host with less divergence between adjacent dominant lamellae but exhibiting no additional splaying at zero supercooling. By contrast, those blends with an n-alkane longer than the host co-crystallize (producing permanent cilia of controlled length) with a constant, but reduced, isothermal lamellar growth rate. Textures are now more spherulitic than the host, with additional splaying of an amount directly proportional to the number of permanent cilia and increasing with their length. The intercepts and slopes of plots of splaying data against supercooling are consistently related to permanent cilia plus inclined packing of initially rough lamellar surfaces and transient ciliation, respectively. The underlying causes of spherulitic growth for long molecules are thereby further confirmed and clarified.

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Published date: January 2002
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 265722
URI: http://eprints.soton.ac.uk/id/eprint/265722
ISSN: 0032-3861
PURE UUID: 57b7df59-20bd-4593-bc62-3b7a1c20d28e
ORCID for I.L Hosier: ORCID iD orcid.org/0000-0003-4365-9385

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Date deposited: 15 May 2008 10:35
Last modified: 25 Sep 2020 01:35

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Contributors

Author: I.L Hosier ORCID iD
Author: D.C Bassett

University divisions

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