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1Crop protection residual plastic films are a growing environmental problem which 2 requires efficient solutions. Their suitability as matrices for obtaining sustainable eco-3 composites reinforced with industrially-sourced residual natural fibers was investigated 4 in order to boost their recovery and prevent waste generation. The analysis of the 5 studied residual agricultural plastics revealed that they are low density polyethylene still 6 containing significant amounts of ethylene-vinyl acetate (2.5 to 4.5 wt%). A pilot-plant 7 extrusion-compounding technology was applied to a selected recycled plastic from 8 residual agricultural films and the residual cellulose fibers for obtaining the eco-9composites. The effects of cellulose-fiber content and a selected maleic anhydride-10 modified polyethylene coupling agent on the properties and interfacial adhesion of the 11 eco-composites were investigated. By using micromechanical models, scientific data of 12 the intrinsic modulus and strength of the Eucalyptus Globulus residual fibers, hitherto 13 scarcely available in literature, were found to be 16.4 GPa and 180 MPa, respectively, 14 thus revealing their suitability as cost-effective reinforcement. Tensile modulus and 15 strength of the eco-composites were up to 667 % and 70 % greater than those of the neat 16 agricultural recycled plastic, the latter due to the enhanced compatibility provided by 17 the ethylene-vinyl acetate found. When the coupling agent was added, tensile and 18 flexural strengths increased up to a maximum of 20.26 MPa and 23.96 MPa, 19 respectively. Property variations were found to be due to the fiber length reduction and 20 the interfacial adhesion improvement caused by the coupling agent as well as to its 21 plasticizing effect. The properties achieved revealed the suitability of the eco-22 composites for their immediate application in the production of numerous 23 environmentally sustainable and cost-effective end-products from the aforementioned 24 wastes. 25 3

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