| 초록 |
Lignin is a low-price abundant wood waste product generated as a by-product during the paper pulp process. The exact chemical structure of lignin is still unknown; however, its various chemical bonds make it very difficult to process it further. In addition, its low molecular weight and poor mechanical properties limit any practical applications. To increase its potential toward industrial applications, isocyanates were often introduced in synthesis of polyurethane by using lignin as a polyol source to enhance molecular weight and mechanical properties. Here, we employed lignin and isocyanate in the extrusion process of polypropylene and glass fiber composites. Herein, isocyanate is introduced to induce chemical covalent bonding between hydroxyl groups of glass fiber and lignin. We will discuss enhanced chemical adhesion between polymer and filler as well as structure-property relationships of the composites. |
