Mapping structural gradients in isotactic polypropylene using scanning wide-angle X-ray scattering

Research output: Contribution to journalArticle

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Mapping structural gradients in isotactic polypropylene using scanning wide-angle X-ray scattering. / Granlund, Håvard; Fløystad, Jostein Bø; Esmaeili, Morteza; Bakken, Eirik Torbjørn; Bech, Martin; Vullum, Per Erik; Andreassen, Erik; Breiby, Dag Werner.

In: Polymer, Vol. 54, No. 7, 22.03.2013, p. 1867-1875.

Research output: Contribution to journalArticle

Harvard

Granlund, H, Fløystad, JB, Esmaeili, M, Bakken, ET, Bech, M, Vullum, PE, Andreassen, E & Breiby, DW 2013, 'Mapping structural gradients in isotactic polypropylene using scanning wide-angle X-ray scattering', Polymer, vol. 54, no. 7, pp. 1867-1875. https://doi.org/10.1016/j.polymer.2013.01.055

APA

Granlund, H., Fløystad, J. B., Esmaeili, M., Bakken, E. T., Bech, M., Vullum, P. E., ... Breiby, D. W. (2013). Mapping structural gradients in isotactic polypropylene using scanning wide-angle X-ray scattering. Polymer, 54(7), 1867-1875. https://doi.org/10.1016/j.polymer.2013.01.055

CBE

Granlund H, Fløystad JB, Esmaeili M, Bakken ET, Bech M, Vullum PE, Andreassen E, Breiby DW. 2013. Mapping structural gradients in isotactic polypropylene using scanning wide-angle X-ray scattering. Polymer. 54(7):1867-1875. https://doi.org/10.1016/j.polymer.2013.01.055

MLA

Vancouver

Author

Granlund, Håvard ; Fløystad, Jostein Bø ; Esmaeili, Morteza ; Bakken, Eirik Torbjørn ; Bech, Martin ; Vullum, Per Erik ; Andreassen, Erik ; Breiby, Dag Werner. / Mapping structural gradients in isotactic polypropylene using scanning wide-angle X-ray scattering. In: Polymer. 2013 ; Vol. 54, No. 7. pp. 1867-1875.

RIS

TY - JOUR

T1 - Mapping structural gradients in isotactic polypropylene using scanning wide-angle X-ray scattering

AU - Granlund, Håvard

AU - Fløystad, Jostein Bø

AU - Esmaeili, Morteza

AU - Bakken, Eirik Torbjørn

AU - Bech, Martin

AU - Vullum, Per Erik

AU - Andreassen, Erik

AU - Breiby, Dag Werner

PY - 2013/3/22

Y1 - 2013/3/22

N2 - The internal microstructure of injection-molded dogbone specimens of talc-filled isotactic polypropylene has been investigated using a home laboratory scanning wide-angle X-ray scattering setup, yielding two-dimensional maps of molecular orientation and ordering for cross-sections parallel and perpendicular to the flow direction with unprecedented details. In addition to demonstrating a high degree of alignment of both the iPP b-axis and the talc c-axis parallel to the sample wall normals, thus corroborating earlier reports, the synthesized maps also yield new insights into the molecular organization. We find an asymmetry in the orientation maps, which we ascribe to a lateral temperature gradient across the mold during solidification. This interpretation is supported by numerical simulations of heat transport during the solidification following material flow, leading to orientation maps in full qualitative agreement with the experimental data. Recent developments in X-ray scattering equipment, in particular fast-readout low-noise area detectors, have facilitated the present experiments, which demonstrate the usability of raster scanning for advanced polymer characterization.

AB - The internal microstructure of injection-molded dogbone specimens of talc-filled isotactic polypropylene has been investigated using a home laboratory scanning wide-angle X-ray scattering setup, yielding two-dimensional maps of molecular orientation and ordering for cross-sections parallel and perpendicular to the flow direction with unprecedented details. In addition to demonstrating a high degree of alignment of both the iPP b-axis and the talc c-axis parallel to the sample wall normals, thus corroborating earlier reports, the synthesized maps also yield new insights into the molecular organization. We find an asymmetry in the orientation maps, which we ascribe to a lateral temperature gradient across the mold during solidification. This interpretation is supported by numerical simulations of heat transport during the solidification following material flow, leading to orientation maps in full qualitative agreement with the experimental data. Recent developments in X-ray scattering equipment, in particular fast-readout low-noise area detectors, have facilitated the present experiments, which demonstrate the usability of raster scanning for advanced polymer characterization.

KW - Injection molding

KW - Isotactic polypropylene

KW - Raster-scanning WAXS

U2 - 10.1016/j.polymer.2013.01.055

DO - 10.1016/j.polymer.2013.01.055

M3 - Article

VL - 54

SP - 1867

EP - 1875

JO - Polymer Communications (Guildford, England)

T2 - Polymer Communications (Guildford, England)

JF - Polymer Communications (Guildford, England)

SN - 0032-3861

IS - 7

ER -