Study of the Mechanical Behavior of Papyrus Fiber-Reinforced Composites

Introduction

The extensive use of petroleum derived polymers has contributed to environmental degradation, particularly through persistent plastic waste in terrestrial and aquatic ecosystems. Global plastic production exceeds 400 million tons annually, with a significant fraction accumulating in landfills or natural environments [1].

Natural fiber reinforced composites (NFRCs) have emerged as viable alternatives, offering biodegradability, renewability, and acceptable mechanical performance for low to medium structural applications [2,3]. Their high strength to weight ratio, ease of processing, and compatibility with adhesives make them attractive for packaging, insulation, and non permanent structural elements [4].

Cyperus Papyrus, historically used as a writing substrate in Ancient Egypt, possesses a fibrous pith rich in cellulose and characterized by low density and flexibility. These attributes suggest potential for reinforcement in bio composites [5]. This study evaluates the mechanical behavior of papyrus laminates fabricated through artisanal weaving and bonding, aiming to assess their suitability for sustainable engineering applications.

Methodology

Papyrus stems were sourced from organic plantations to avoid chemical contamination.

Figure 1: Cyperus Papyrus Plantation

Deteriorated specimens were excluded.

The rigid outer bark was removed, and the pith was sliced into strips (~1 mm thick). Strips were hydrated for seven days, then manually cross woven to form sheets.

Figure 2: Papyrus Stripes After Treatment (Left); Papyrus Sheet (Right)

Sheets were pressed under 110 bar for seven days to promote adhesion and drying. Laminates were bonded with Ceys® white glue to a thickness of 5 mm and re pressed for 24 hours.

Specimens (120 × 25 × 5 mm³) were tested using a SHIMADZU AG X 100 kN universal machine at 2 mm/min displacement, following ISO 527 4 [6]. Stress strain curves were recorded, and tensile strength, elastic modulus, and elongation were calculated.

Results

Table 1 Summarizes Tensile Test Results.

                                       Specimen  Tensile Strength (MPa)  Elastic Modulus (MPa)  Elongation (%)

The composite exhibited consistent mechanical behavior, with tensile strength ranging between 2.48–4.15 MPa. Elastic modulus averaged 0.15 GPa, lower than synthetic composites (0.56–1.7 GPa) but superior to PVC cables (0.006 GPa) and styrene butadiene copolymers (0.0689 GPa) [7].

Discussion

The papyrus laminate demonstrated predictable mechanical performance, with relatively low dispersion compared to synthetic counterparts. While tensile strength is modest, the material’s stability and cohesion make it suitable for applications where reliability and biodegradability outweigh high strength requirements.

The methodology, inspired by ancestral papyrus fabrication, illustrates how traditional techniques can be adapted for modern composite processing. Optimization strategies such as fiber surface treatments, improved weaving patterns, or resin impregnation could enhance mechanical properties.

Conclusions

This study confirms the feasibility of papyrus fiber laminates for low load applications.

With tensile strength of 3.32 MPa and elastic modulus of 149.3 MPa, the material competes with lightweight foams and certain natural composites.

Potential applications include biodegradable packaging, decorative elements, and eco friendly reinforcement components.

Future work should focus on process optimization, hybridization with technical resins, and evaluation of durability under environmental exposure.

Acknowledgments

The authors acknowledge the Fundação Terras de Santa Maria da Feira for financial support of this work.

References

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