Achieving High-Ductile Polylactide Sheets with Inherent
Strength via a Compact and Uniform Stress Conduction Network
Posted on 2020-06-16 - 21:04
Conventional
methods for toughening polylactide (PLA), such as
plasticization and blending with flexible components, are prone to
cause large reduction in its strength and stiffness. The objective
of this study was to highly increase the ductility of PLA sheets without
compromising its strength and sustainable nature. A compact and uniform
stress conduction network was constructed inside PLA based on the
scaffold-network nuclei from entanglement network of long chain branchedPLA,
which dramatically increased the elongation at break from 8 to 229%
and simultaneously enhanced the yield strength by 5% than normal PLA.
Preorientation and homogeneity of PLA melts through layer-multiplying
elements are indispensable for the growth of a compact and uniform
network-like precursor from the scaffold-network nuclei. The existence
of a network-like precursor was also implied from the observation
of a network-like crystal by scanning electron microscopy (SEM) after
the dynamic dissolution–crystallization process during high-temperature
etching treatment. The toughening mechanism was proposed based on
the stress transfer of the network-like precursor as a stress-conducting
network and evidenced by the deformation of the network-like precursor
as shown in the SEM images. The microfibrillation and microsized voids
formed during deformation also largely promoted the energy consumption
in tensile tests. This work brings new insights into the field of
PLA toughening with sustained good strength and stiffness of original
materials under the processing conditions of normal draw ratios.
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Guo, Yuhang; Peng, Shuangjuan; Wang, Qingwen; Song, Xudong; Li, Chunhai; Xia, Lichao; et al. (2020). Achieving High-Ductile Polylactide Sheets with Inherent
Strength via a Compact and Uniform Stress Conduction Network. ACS Publications. Collection. https://doi.org/10.1021/acs.iecr.0c01328