Synthesis and characterization of partially bio-based polyimides based on biphenylene-containing diisocyanate derived from Vanillic acid (cas 121-34-6)

Add time:09/08/2019    Source:sciencedirect.com

A new bio-based biphenylene-containing diisocyanate, namely, 5,5′-diisocyanato-2,2′,3,3′-tetramethoxy-1,1′-biphenyl (BDI) was synthesized starting from vanillic acid – a lignin-derived phenolic acid. A series of new partially bio-based polyimides was prepared by polycondensation of BDI with five commercially available aromatic dianhydrides. Polyimides exhibited good solubility in organic solvents and medium molecular weights (Mn (GPC, polystyrene standard) = 25,100–32,200 g mol−1). Polyimides showed good thermal stability with 10% degradation temperature and glass transition temperature in the range 459–473 °C and 262–329 °C, respectively.

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