Rhubarb petioles inspire biodegradable cellulose fibre-reinforced PLA composites with increased impact strength

被引：20

作者：

Graupner, Nina ^{[1
]}

Labonte, David ^{[2
]}

Muessig, Joerg ^{[1
]}

机构：

[1] HSB City Univ Appl Sci Bremen, Biomimet, Fac 5, Biol Mat Grp, Bremen, Germany

[2] Univ Cambridge, Dept Engn, Nanosci Ctr, Cambridge, England

来源：

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2017年 / 98卷

关键词：

Biocomposites; Natural fibers; Impact strength; Mechanical testing; MECHANICAL-PROPERTIES; FUNCTIONALLY GRADIENT; TENSILE FAILURE; ADHESION; LENGTH;

D O I：

10.1016/j.compositesa.2017.03.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The petioles of red rhubarb are load-bearing structures which need to combine sufficient stiffness with high toughness. Although mostly consisting out of water, the petioles showed a remarkable Charpy impact strength, partly based on their beam-like structure: outermost bark fibre bundles provide stiffness and strength, and surround a core reinforced with ductile vascular bundles, which dissipate impact energy at two hierarchical levels: helical fibres in the vascular bundles are straightened, and both helical fibres and bundles are pulled-out of the parenchyma. Using technical composites made from stiff and ductile cellulose fibres as a model system, we investigated the functional significance of the fibre arrangement further. The impact resistance of bio-inspired composites exceeded that of composites with identical fibre-fraction but random fibre-distribution by more than a factor of two, while their tensile and flexural properties did not differ significantly, suggesting promising new routes for the design of tough, bio-compatible composites. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：218 / 226

页数：9

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