Abstract
In this paper, we report on the production of modified pullulan derivatives that have been produced in solution by ring-opening e-caprolactone and [l]-lactide using a tin octanoate [Sn(Oct)2] catalyst system in DMSO. These derivatives designated as hexanoates (1 and 2) and dilactates (4−7) have been characterized and have varying degrees of substitution (DS). 1 and 2 were characterized by interesting thermal properties as well as crystalline morphology. From DSC analysis, 2, unlike the parent polysaccharide, appears to melt at 114 °C. The crystalline morphology of this polymer was characterized by X-ray powder diffraction and d spacings were calculated. This pullulan derivative possessed new crystallographic reflections not seen in either pullulan or poly (e-caprolactone). The pullulan-6 dilactate samples (4−7), produced had DS values ranging from 0.1 to 0.75. Depending upon the DS, these samples were soluble in a wide range of organic solvents including acetone and methanol. Although these materials did ...
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