Bioinspired fracture toughness enhancement of a fully bio-based epoxy resin

被引：6

作者：

Schwaiger, Markus ^{[1
]}

Waly, Christoph ^{[1
]}

Huszar, Michael ^{[1
]}

Oreski, Gernot ^{[2
]}

Feuchter, Michael ^{[1
]}

Arbeiter, Florian ^{[1
]}

Resch-Fauster, Katharina ^{[1
]}

机构：

[1] Univ Leoben, Mat Sci & Testing Polymers, Otto Gloeckel Str 2, A-8700 Leoben, Austria

[2] Polymer Competence Ctr Leoben GmbH, Roseggerstr 12, A-8700 Leoben, Austria

来源：

POLYMER TESTING | 2023年 / 124卷

基金：

欧盟地平线“2020”;

关键词：

Bio-based epoxy resin; Bio-composite; Epoxidized linseed oil; Fracture toughness; Material inhomogeneity; Layered structures; MULTILAYER; STRENGTH; MODULUS; DESIGN;

D O I：

10.1016/j.polymertesting.2023.108098

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this work, the concept of fracture toughness improvement via spatial variation of mechanical properties is applied to a composite with 100% bio-based carbon content based on epoxidized linseed oil. By proper selection of the hardener, either citric acid or sebacic acid, the mechanical properties were adjusted in a way that a biocomposite exhibits a stiff-soft-stiff layer architecture. Samples with two different thicknesses of soft interlayer (approx. 0.1 mm and 1.3 mm) were subsequently analyzed regarding their final performance. Specimen characteristics, owing to the curing and manufacturing process, were analyzed by means of local Fourier-transform infrared spectroscopy and differential scanning calorimetry. Fracture mechanics tests were performed to verify if the soft interlayer acts as a crack arrester. The results propose a high chemical compatibility between the used epoxy resins. Embedding a soft thin interlayer into a stiff resin matrix led to an increase in fracture toughness of 13 times, compared to the pure stiff resin. An increase in interlayer thickness led to a further increase in fracture toughness of 24 times. However, the stiffness decreased by 44% and 67%, respectively.

引用

页数：10

共 52 条

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