Abstract
The interfacial shear strength of short regenerated cellulose fibre/polylactide composites was characterized by means of an industry-friendly adhesion test method. The interfacial shear strength was back-calculated from the experimental tensile stress-strain curves of composites by using a micro-mechanical model. The parameters characterizing the microstructure of the composites, e.g. fibre length and orientation distributions, used as input in the model were obtained by micro-tomography. The investigation was carried out on composites with untreated and surface treated fibres with various fibre weight contents (5wt%, 10wt%, and 15wt% for untreated fibres, and 15wt% for treated fibres). The properties of fibres were measured by an automated single fibre tensile test method. Based on these results, the efficiency of the fibre treatment to improve fibre/matrix adhesion is evaluated, and the applicability of the method to measure the interfacial shear strength is discussed. The results are compared with data from previous work, and with other results from the literature.
Highlights
During recent years, cellulosic fibres have been considered as feasible replacement of synthetic reinforcement for polymer composites designed for long term use in structures
A comprehensive characterization of regenerated cellulose fibres and their composites based on a Polylactic acid (PLA) matrix was carried out in order to evaluate interfacial shear strength in the composites
The internal structure of composite was characterized by X-ray tomography, and input parameters for micro-mechanical models were obtained
Summary
Cellulosic fibres (natural and manmade) have been considered as feasible replacement of synthetic reinforcement (e.g. glass fibres) for polymer composites designed for long term use in structures. The driving force for such development is the concern regarding impact of production of composites on environment, and the growing demand for sustainable and recyclable materials This trend is reflected in the growing number of publications on the subject as shown in literature reviews [1,2] on development of bio-based engineering materials. One of the weaknesses of cellulosic fibres is their typical poor compatibility with polymers, and the resulting weak fibre/matrix adhesion which strongly affects the mechanical properties of composite materials. This problem can be addressed by modifying the fibre surface to enhance the chemical bonding between composite constituents [3]. It has been shown that the grafting of carbon nano-tubes on conventional
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