Abstract
Polymer blends consisting of hydroxypropyl lignin (HPL) and poly(vinyl alcohol) (PVA) hydrolysed to the extent of 75, 88 and 96% were prepared by casting from dimethylformamide solution. The resulting films were studied with regard to their morphology by scanning electron microscopy, differential scanning calorimetry and dynamic mechanical thermal analysis. Results suggest that HPL/PVA blends form homogeneous and at least partially miscible materials (with separated phases of <2000 A ̊ at any composition. This is attributed both to similarity in solubility parameter and to the formation of hydrogen bonds. Supporting evidence is derived from scanning electron microscopy of freeze-fractured surfaces, from quantitative melt endotherm measurements, and from measurements of the position and range of glass transition temperatures.
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