Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session W26: Physics-Informed Design of Recycled, Upcycled, and Sustainable Polymers: Additives and Processing Conditions
3:00 PM–6:00 PM,
Thursday, March 7, 2024
Room: 101G
Sponsoring
Unit:
DPOLY
Chair: Wenlin Zhang, Dartmouth College
Abstract: W26.00004 : Enhanced Mechancial Properties in Uniaxially Stretched Films of Diblock Polymer Modified Poly(L-lactide)
3:36 PM–3:48 PM
Presenter:
Jonathan P Coote
(University of Minnesota)
Authors:
Jonathan P Coote
(University of Minnesota)
Charles McCutcheon
(University of Minnesota)
Boran Zhao
(University of Minnesota)
Matthew Larson
(University of Minnesota)
Frank S Bates
(University of Minnesota)
Christopher J Ellison
(University of Minnesota)
but lacks the toughness required for many applications. Chain alignment via uniaxially stretching
significantly toughens PLLA in the machine direction (MD) but leaves the transverse direction (TD)
brittle. This work reports uniaxially stretched films of PLLA blended with 3 wt% poly(ethylene oxide)-b-
poly(butylene oxide) (PEO-PBO/PLLA) with increased toughness in both MD and TD. Tensile testing in
the MD showed toughness in both PLLA and PEO-PBO/PLLA, with shear yielding as the primary
mechanism of deformation. In the TD, by contrast, PEO-PBO/PLLA films outperformed PLLA and
deformed uniformly by crazing. Faster stretching was shown to enhance the mechanical properties of
both MD and TD and was correlated with greater degrees of crystallinity and crystallite alignment
determined by wide-angle X-ray scattering. Increasing the stretching rate from 2 %s -1 to 100 %s -1
increased the yield stress in the MD from 76 MPa to 95 MPa, while in the TD elongation at break was
increased from 12 % to 36 %, exceeding that of the MD. In summary, this work presents uniaxially-
stretched but biaxially-toughened PEO-PBO/PLLA as a more sustainable alternative to conventional
plastics.
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