Plasticization of methylated kraft lignin-based polymeric materials by miscible low glass transition temperature (Tg) aliphatic polyesters affects the x-ray powder diffraction pattern in a counterintuitive manner. The d-spacing at the point of maximum intensity in the characteristic amorphous halo is displaced towards smaller values. A reduction in molecular weight of the kraft lignin components alone engenders a similar trend. These effects can be understood by describing the diffuse scattering from methylated kraft lignin preparations as a sum of two overlapping Lorentzian component peaks centered at d = ~4.1 Å and d = ~5.1 Å. Comparison with the crystal structures of selected di- and trilignols indicates that these two peaks encompass d-spacings between aromatic rings which are, respectively, in roughly parallel-but-offset and edge-on orientations relative to one another. As would be expected, the latter peak is broadened much more than the former when a miscible low-Tg polymer is blended into a methylated kraft lignin-based material.
- Amorphous polymeric materials
- Kraft lignin-based polymeric materials
- X-Ray diffraction patterns from lignin preparations
- X-ray powder diffraction analyses of kraft lignin-based thermoplastic polymer blends
- X-ray powder diffraction patterns from methylated kraft lignin-based plastics
- X-ray powder diffraction patterns from paucidisperse kraft lignin fractions
- alkylated kraft lignin-based thermoplastic blends with low-Tg polymers