| 초록 |
In this study, a simple method was investigated to fabricate cellulose nano fibers (CNFs) by chemical and mechanical process from cellulose powders (CPs). Hydroxyl groups of two kinds of CPs (fiber / spherical type) having 10 ~ 40 µm diameter size, were chemically modified as sulfur contents. The CPs were micro-fibrillated through passing once micron slot of microfluidizer, then the CNFs which have a size of about 30 nm were easily obtained because of its electrostatic repulsion of positive charged sulfur molecules. It was confirmed that the modulus and stiffness of CNFs significantly improved comparing to existing CPs, and the CNFs used as reinforcing additives to increase mechanical properties of polypropylene (PP) composites using the twin extruder. |
