| 초록 |
Poly lactic acid (PLA) is a bio-degradable polyester which can be derived from renewable resources such as starch. A cellulose nanofiber (CNF) derived from renewable biomass has an advantage as a reinforcement due to its excellent reinforcing effect. When using cellulose nanofiber, due to their polar surface, it is difficult to disperse CNF uniformly in a non-polar polymer matrix. In this study, in order to improve the dispersity of cellulose nanofiber, the microcrystalline cellulose particles were swelled and separated to cellulose nanofibers by sulfuric acid treatment and ultra sonication treatments. PLA/CNF composite solutions were prepared by incorporating 0.1 and 0.5 wt% obtained CNF into a PLA matrix. To investigate the effect of cellulose nanofiber content as reinforcement in the PLA/CNF composites, thermal behavior, mechanical properties and rheological analysis were performed. This research was supported by the National Research Foundation of Korea (Project No. 2011-0011515). |
