The Effect of Incorporation of Cellulose Nanocrystal on Polymer Dynamics and Rheological Properties of Polylactic-acid Nanocomposites
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내용
Polylactic acid (PLA) is a biopolymer with excellent mechanical, and thermal properties and biodegradability. The properties can be reinforced by incorporating nanoparticles (NPs), producing polymer nanocomposites (PNCs). In improving physical properties of PNC, the adsorption layer of polymer to NP, distinct from bulk polymer, plays a critical role and requires careful characterization. However, research on PLA nanocomposites focusing on adsorption is very limited. We investigate the adsorption of PLA nanocomposites focusing on its dynamics and rheological properties. Among NPs, eco-friendly cellulose nanocrystal (CNC) is a suitable filler for PLA, with silica NP used for comparison. CNC produced a robust network in PLA matrix, and unlike silica, exhibited clear adsorption due to interactions with PLA chains. QENS analysis revealed that CNC significantly slowed PLA segmental dynamics, indicating strong adsorption. Finally, CNC showed notable reinforcement in rheological properties due to its unique adsorption behavior with PLA.