How do cellulose nanocrystals affect the overall properties of biodegradable polymer nanocomposites: A comprehensive review

•Interest for biodegradable polymers is increasing driven by sustainability trend.•Use of CNC as reinforcement in polymer nanocomposites is highlighted.•Effect of CNCs on the overall properties of the nanocomposites is discussed.•Focus on rheological, thermal, mechanical, barrier and biodegradation properties.