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Chain-folding and overall molecular conformation in a novel amphiphilic starlike macromolecule

Chain-folding and overall molecular conformation in a novel amphiphilic starlike macromolecule
Chain-folding and overall molecular conformation in a novel amphiphilic starlike macromolecule
The crystallization and self-assembly behavior of an amphiphilic starlike macromolecule (ASM) with a lipophilic core and four poly(ethylene oxide) (PEO) arms (Mn = 2000 g/mol) were characterized by synchrotron small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction at different crystallization temperatures (Tc). The overall d-spacing of the alternating amorphous core and crystalline PEO lamellae almost doubled from 11.4 nm for samples quenched into liquid nitrogen to 21.0 nm for Tc = 42 °C, indicating gradual transitions from nearly once-folded to fractionally folded and finally to extended chain crystals with increasing the Tc. On the basis of SAXS, transmission electron microscopy, and computer simulation results, it was suggested that the lamellae contained an interdigitated, single-layered PEO crystal, and an amorphous layer consisted of a double-layered lipophilic core and amorphous PEO. A folded (four PEO arms at one side of the core) rather than an extended (two PEO arms on each side of the core) overall molecular conformation (OMC) of the ASM was deduced in the solid state. These results implied that chain-folding and OMC of the ASM closely depended on its star-block-like architecture.
7074-7082
Miao, Jianjun
880a8ace-2125-42f6-8fe6-7989fe708b32
Xu, Guoqiang
e29fa0f3-379e-4a3f-b7ac-f5c7163fcfee
Zhu, Lei
8b4e6183-2c05-434c-be36-70a19352825c
Tian, Lu
214356e6-268e-4095-9e48-a36ebf6f7162
Uhrich, Kathryn E.
34436866-4156-4408-81c4-e06a43c3edc7
Avila-Orta, Carlos A.
79230742-ce75-4131-be7f-9eebe9eb812a
Hsiao, Benjamin S.
91b9795c-a6d7-4358-b39d-649cd578584c
Utz, Marcel
c84ed64c-9e89-4051-af39-d401e423891b
Miao, Jianjun
880a8ace-2125-42f6-8fe6-7989fe708b32
Xu, Guoqiang
e29fa0f3-379e-4a3f-b7ac-f5c7163fcfee
Zhu, Lei
8b4e6183-2c05-434c-be36-70a19352825c
Tian, Lu
214356e6-268e-4095-9e48-a36ebf6f7162
Uhrich, Kathryn E.
34436866-4156-4408-81c4-e06a43c3edc7
Avila-Orta, Carlos A.
79230742-ce75-4131-be7f-9eebe9eb812a
Hsiao, Benjamin S.
91b9795c-a6d7-4358-b39d-649cd578584c
Utz, Marcel
c84ed64c-9e89-4051-af39-d401e423891b

Miao, Jianjun, Xu, Guoqiang, Zhu, Lei, Tian, Lu, Uhrich, Kathryn E., Avila-Orta, Carlos A., Hsiao, Benjamin S. and Utz, Marcel (2005) Chain-folding and overall molecular conformation in a novel amphiphilic starlike macromolecule. Macromolecules, 38 (16), 7074-7082. (doi:10.1021/ma050983q).

Record type: Article

Abstract

The crystallization and self-assembly behavior of an amphiphilic starlike macromolecule (ASM) with a lipophilic core and four poly(ethylene oxide) (PEO) arms (Mn = 2000 g/mol) were characterized by synchrotron small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction at different crystallization temperatures (Tc). The overall d-spacing of the alternating amorphous core and crystalline PEO lamellae almost doubled from 11.4 nm for samples quenched into liquid nitrogen to 21.0 nm for Tc = 42 °C, indicating gradual transitions from nearly once-folded to fractionally folded and finally to extended chain crystals with increasing the Tc. On the basis of SAXS, transmission electron microscopy, and computer simulation results, it was suggested that the lamellae contained an interdigitated, single-layered PEO crystal, and an amorphous layer consisted of a double-layered lipophilic core and amorphous PEO. A folded (four PEO arms at one side of the core) rather than an extended (two PEO arms on each side of the core) overall molecular conformation (OMC) of the ASM was deduced in the solid state. These results implied that chain-folding and OMC of the ASM closely depended on its star-block-like architecture.

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More information

Published date: 9 July 2005
Organisations: Chemistry, Faculty of Natural and Environmental Sciences, Magnetic Resonance

Identifiers

Local EPrints ID: 355569
URI: https://eprints.soton.ac.uk/id/eprint/355569
PURE UUID: 621eaf26-d702-40f4-9afc-cbea9928d341
ORCID for Marcel Utz: ORCID iD orcid.org/0000-0003-2274-9672

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Date deposited: 24 Oct 2013 13:45
Last modified: 20 Jul 2019 00:40

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Contributors

Author: Jianjun Miao
Author: Guoqiang Xu
Author: Lei Zhu
Author: Lu Tian
Author: Kathryn E. Uhrich
Author: Carlos A. Avila-Orta
Author: Benjamin S. Hsiao
Author: Marcel Utz ORCID iD

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