나노셀룰로오스의 미세구조와 복합소재 응용에 관한 연구

Abstract

Renewable materials have been considered as one of the candidates to replace fossil resources when environmental issues have been on the rise. Moreover, to use natural polymer materials for various industrial applications, many researchers have focused on cellulose materials, which have some remarkable benefits such as low density, high absorptivity, low cost, and biodegradability. Recently, conversion of the cellulose structure from micro- to nano-scale have been studied to enhance its mechanical, thermal and optical properties. In this study, we present fabrication methods for nanofibrilled-celluoses (NFCs) using grinder method and aqueous counter collision treatment from the micro-celluose. Between these two NFCs production methods, the grinder method is the effective means in terms of high strength. It is attributed to the NFC diameter, which is decreased as the process cycles are increased; as a result, NFCs films show higher tensile strength than raw cellulose. PLA/NFC composites were fabricated and examined the mechanical properties. The results proved that the tensile strength of the prepared composites was improved by reinforcing effect of NFCs. Therefore, this study shows that the cellulose materials can be applied to automobile, construction and household goods as eco-friendly and sustainable materials with high mechanical properties.