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Largely enhanced mechanical performance of poly(butylene succinate) multiple system via shear stress-induced orientation of hierarchical structure

Abstract

In order to fabricate the oriented hierarchical structure of biodegradable poly(butylene succinate) (PBS) and thus improve its mechanical properties, oscillation shear stress was imposed on the melt during solidification, aiming to stretch polymer chain and suppress the relaxation of the oriented chains. Abundant oriented interlocked shish-kebabs were formed with the aid of intense shear stress and poly(L-lactide) (PLA), which was demonstrated through small angle X-ray scattering (SAXS), scanning electronic microscopy, and wide angle X-ray diffraction (WAXD). The distinctly oriented structure in the core layer of the structured samples could well clarify the role of PLA in promoting shear-induced oriented hierarchical structure of PBS. With such unique hierarchical structure, the tensile strength, modulus and impact strength of structured sample with 10 wt% PLA were simutanousely enhanced from 36.4 MPa, 390.2 MPa and 23.3 KJ/m2 for conventional neat PBS to 49.1 MPa, 634.0 MPa and 28.7 KJ/m2, gaining a remarkable enhancement of 34.9%, 62.5% and 23.2%, respectively. The simultaneous reinforcement and toughening was achieved due to oriented hierarchical structure. Cavity forms along with lamellae fragmentation and recrystallization during tensile deforming, revealed by WAXD and SAXS of tensile broken samples. Compared with isotropic structure, the oriented hierarchical structure not only prevent the slippage of molecular chains and bear larger stress, but also limit the formation of cavity due to high density. These surprising results are of importance to bridge the gap between the hierarchical structure and performance of PBS, offering helpful guidance to design and fabricate the structure of PBS during the practical processing.

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Publication details

The article was received on 24 Apr 2018, accepted on 05 Jun 2018 and first published on 07 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA03778G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Largely enhanced mechanical performance of poly(butylene succinate) multiple system via shear stress-induced orientation of hierarchical structure

    X. Xie, Y. Li, J. Xu, Z. Yan, G. Zhong and Z. Li, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA03778G

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