The present invention relates to a production method for synthesizing environmentally friendly polyester and a composite material thereof by utilizing a suberin monomer and a lignin/cellulose residue extracted from cork. In the present invention which is related to a method for producing a polyester composite material, the extraction efficiency is improved through the extraction method different from conventional extraction methods, and the polyester composite material has improved physical properties through mixing a lignin/cellulose residue, which is a residue obtained from an extraction process, with a reinforcing agent.;COPYRIGHT KIPO 2018
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