Insights into strain-induced solid mesophases in melt-spun polymer fibers

POLYMER

卷:229

Article

Perret, Edith^1,2  Hufenus, Rudolf¹ 

[1] Swiss Fed Labs Mat Sci & Technol, Empa, Lab Adv Fibers, Lerchenfeldstr 5, CH-9014 St Gallen, Switzerland

[2] Swiss Fed Labs Mat Sci & Technol, Ctr Xray Analyt, Empa, Uberlandstr 129, CH-8600 Dubendorf, Switzerland

关键词: Mesophase;    Wide-angle x-ray diffraction;    Melt-spun fibers;    Quantification;   

DOI  :  10.1016/j.polymer.2021.124010

来源: Elsevier

【 摘 要 】

This article provides an overview of strain-induced solid mesophases in polymer fibers, melt-spun from amorphous (polycarbonate, cyclo-olefin polymer, copolyamide, polyethylene terephthalate glycol) and semicrystalline materials (polyethylene terephthalate, poly-3-hydroxybutyrate). The discussed mesophases are made of stretched, conformationally disordered macromolecules that are highly oriented along the fiber axis, and that reveal variations in their lateral spacing. Fitting algorithms for respective wide-angle x-ray diffraction (WAXD) patterns are put forward, and are directly tested on fibers melt-drawn from amorphous as well as semicrystalline polymers. Equatorial, meridional, off-axis and azimuthal profiles are extracted from WAXD patterns and are simultaneously fitted. Best fit parameters contain detailed structural information, and lead to simulated 2D WAXD patterns, which in turn can be used to quantify the phases that are present in the fibers. We postulate that mesophases, which lead to broad equatorial reflections in WAXD patterns, can be found in all types of drawn melt-spun polymer fibers.

【 授权许可】

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