10.1021/acs.macromol.6b02714.s001
Wilhelm Kossack
Wilhelm
Kossack
Anne Seidlitz
Anne
Seidlitz
Thomas Thurn-Albrecht
Thomas
Thurn-Albrecht
Friedrich Kremer
Friedrich
Kremer
Molecular Order in Cold Drawn, Strain-Recrystallized
Poly(ε-caprolactone)
American Chemical Society
2017
IR-TMOA
S xx
PCL
transition moment orientational analysis
order parameter tensor
deformation
Hermans orientation function
crystallite
2017-02-02 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Molecular_Order_in_Cold_Drawn_Strain-Recrystallized_Poly_-caprolactone_/4613122
Biaxial order in
free-standing films of poly(ε-caprolactone)
(PCL), induced by plastic deformation and fibrillation, is studied
by infrared transition moment orientational analysis (IR-TMOA) and
X-ray diffraction (pole figures). This enables one to determine the
order parameter tensor for the different molecular moieties with respect
to the sample coordinate system. The main chains of the polymers are
aligned with the stretching direction (<u><i>x</i></u>), leading to a strong order of the crystallites (Hermans
orientation function, <i>S</i><sub><i>xx</i></sub> = 0.9 ± 0.1), and less ordered, amorphous regions (<i>S</i><sub><i>xx</i></sub> = 0.34 ± 0.1). The
microscopic biaxiality of the system, |<i>S</i><sub><i>yy</i></sub> – <i>S</i><sub><i>zz</i></sub>| ≈ 0.1, is caused by the macroscopically asymmetric
deformation perpendicular to the stretching direction. Cold drawing
leads to a reduction in crystallinity and distorted crystallites in
the fibrils, indicating the absence of “melting and recrystallization”
or “fine slip” processes.