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Cotton plain fabrics have been used to reinforce polylactic acid (PLA) resin to make a green composite.The PLA has been modified with PPgMA to improve the interface properties between cotton and the PLA.Various contents (2%, 4%, 6%, 8%, 10% and 12%)of PPgMA were added into the PLA to improve the adhesion and toughness of the PLA.A Xenon weather meter was used to inspect the anti-aging characteristics of the modified PLA.Furthermore, the degradation of the modified PLA is discussed in this paper.