Scanning Small-Angle X-ray Scattering of Injection-Molded Polymers: Anisotropic Structure and Mechanical Properties of Low-Density Polyethylene

Björn, Linnea, 1994 (författare): Chalmers tekniska högskola,Chalmers University of Technology

Liebi, Marianne, 1984 (författare): Chalmers tekniska högskola,Chalmers University of Technology

(creator_code:org_t)

Relaterad länk:: https://research.cha... (primary) (free); visa fler...; https://research.cha...; https://doi.org/10.1...; visa färre...

Abstract Ämnesord

Stäng

Injection molding is known to create a layered anisotropicmorphologyacross the sample thickness due to varying shear and cooling ratesduring the manufacturing process. In this study, scanning small-angleX-ray scattering was used to visualize and quantify the distributionof hierarchical structures present in injection-molded parts of low-densitypolyethylene (LDPE) with varying viscosities. By combining scatteringdata with results from injection molding simulations and tensile testing,we find that oriented shish-kebab structures, as well as elongatedspherulite structures consisting of semicrystalline ellipsoids, contributeto high ultimate tensile strength along the flow direction. Furthermore,we show that a higher degree of orientation is found close to theinjection gate and in LDPE with higher viscosity, consequently fromelevated shear and cooling rates present during the injection moldingprocess.

Av författaren/redakt...: Björn, Linnea, 1 ...; Melhado Mazza, R ...; Andreasson, Eski ...; Linell, Fredrik; Lutz-Bueno, Vivi ...; Guizar-Sicairos, ...; visa fler...; Persson Jutemar, ...; Liebi, Marianne, ...; visa färre...

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Kemiteknik; och Polymerteknologi

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