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

被引：3

作者：

Bjorn, Linnea ^{[1
,2
]}

Melhado Mazza, Renan ^{[3
]}

Andreasson, Eskil ^{[3
]}

Linell, Fredrik ^{[3
]}

Lutz-Bueno, Viviane ^{[4
]}

Guizar-Sicairos, Manuel ^{[4
]}

Persson Jutemar, Elin ^{[3
]}

Liebi, Marianne ^{[1
,4
,5
]}

机构：

[1] Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden

[2] Chalmers Univ Technol, FibRe Ctr Lignocellulose Based Thermoplast, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden

[3] Tetra Pak, S-22186 Lund, Sweden

[4] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[5] Ecole Polytech Federale Lausanne EPFL, Inst Mat, CH-1015 Lausanne, Switzerland

来源：

ACS APPLIED POLYMER MATERIALS | 2023年 / 5卷 / 08期

关键词：

polyethylene; scanning SAXS; mechanical performance; morphology; computational modeling; FLOW-INDUCED CRYSTALLIZATION; ISOTACTIC POLYPROPYLENE; SHISH-KEBAB; DEFORMATION; ORIENTATION; VALIDATION; BEHAVIOR; TENSILE; SHEAR;

D O I：

10.1021/acsapm.3c01007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：6429 / 6440

页数：12

共 42 条

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