▎ 摘　　要

NOVELTY - Method for producing biodegradable polymer nanocomposite, involves (a) dispersing graphene nanoplatelets into a matrix of biodegradable polymer, and (b) extruding the matrix of biodegradable polymer containing the graphene nanoplatelets to obtain the biodegradable polymer nanocomposite. USE - The method is used for producing a biodegradable polymer nanocomposite (claimed). The nanocomposite is used as biodegradable plastics, and used for packaging or for carrier bags. The packaging applications include containers, bottles, drums, trays, boxes, cups, food packaging, protection packaging, and product packaging. ADVANTAGE - The nanocomposite provides a solution to the existing problem of brittle, weak, environmentally unsustainable and economically inviable conventional biodegradable plastics having low impact resistance, heat resistance, and barrier resistance. The nanocomposite provides a graphene-polymer nanocomposite that serves as an efficient biodegradable packaging and replacement of bio-based plastics. The nanocomposite enables mechanically stronger, heat resistant and economical polymer nanocomposite that is environmentally sustainable and suitable for large-scale production. The nanocomposite is thinner, lighter, less wasteful and high economic. The nanocomposite utilizes graphene nanoplatelets to enhance barrier strength of the biodegradable polymer, substantially reduce permeability of liquid, gas and odour through them. The nanocomposite prevents premature degradation of items stored in them by shielding it against UV radiations, and has improved thermal properties. The nanocomposite ensures rapid manufacturing speed, and has improved thermal properties of the graphene nanoplatelets that enhances conduction and convection of the biodegradable polymer nanocomposite. The nanocomposite has enhanced output speed of the biodegradable polymer nanocomposite owing to its faster rate of heating and cooling. The nanocomposite ensures substantially reduced manufacturing cost, and makes its large-scale production feasible. The nanocomposite is fully decomposable (biodegradable or compostable) bio-based plastic, where the biodegradable polymer nanocomposite is produced partly or wholly with biologically sourced polymers. The nanocomposite is decomposed by the action of living organisms, usually microbes, into water, carbon dioxide, and biomass, in a given time frame. The nanocomposite utilizes graphene nanoplatelets to improve mechanical properties such as stiffness, strength and hardness of a biodegradable polymer matrix, to provide high degree of exfoliation. The nanocomposite has high bonding between the graphene nanoplatelets and chains of polymer in the matrix of biodegradable polymer, and has increased thermal conductivity to eliminate occurrence of excessive temperature zones in the graphene-polymer nanocomposite that causes its thermal degradation. The nanocomposite evenly distributes heating and cooling and is time-efficient. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a biodegradable polymer nanocomposite comprising unagglomerated graphene nanoplatelets dispersed in biodegradable polymer.