文摘
In this study, butylolactone-modified lignin (BLL) and tetrahydrofuran-modified lignin (THFL) were used for alkyl chain modification of lignin in order to mimic the relation of lignin-carbohydrate-complex (LCC) and cellulose. The result of FT-IR and 1H-NMR analysis indicate that lignin was well modified. It is confirmed that Aromatic OH of lignin (ArOH, 9.86 ppm) and Aliphatic OH of lignin (AlOH, 3.88 ppm) were decreased. Tensile properties of THFL/polypropylene (PP) blend are increased better than lignin/PP or acetylated lignin/PP. BLL/polyethylene terephthalate (PET) blend shows typical “rule of mixture” behavior because property of alkyl chain (P4HB) well reflected that used for modification of BLL. The results of thermal and mechanical analyses of modified lignin/matrix blends demonstrate that the characteristics of the alkyl chains used to modify lignin were well reflected in the final blends compared with lignin/matrix. In the case of THFL/ PP blend shows phase separation because of miscibility gap between alkyl chain of THFL and PP. The result of XRD analysis indicate that BLL/PET shows increased crystallinity because of good compatibility and THFL/PP shows opposite behavior. It can be confirmed that type of alky chain and miscibility gap between alkyl chain-matrix affect mechanical properties enormously in the fungi degradable environment.