• composites;
  • crosslinking;
  • lignin;
  • polyester;
  • strength


Lignin and switchgrass based poly (butylene succinate) composites were prepared using a melt mixing technique. The effects of polymeric methylene diphenyl diisocyanate (pMDI), isocyanate terminated polybutadiene prepolymer (ITPB) and organic peroxide on the properties of the composites were evaluated. Peroxide and pMDI resulted in the improvement of the tensile and flexural strengths of the composites. ITPB enhanced the impact strength of the material. The degree of crystallinity of the polymer increased with the addition of fillers and reduced with the incorporation of chemical additives. The composites exhibited about 252–333% higher storage modulus than the virgin plastic. Good interfacial morphologies were observed for composites with chemical additives. Mechanisms were deduced for the predicted chemical reactions.mame201300038-gra-0001