Ramie/PLA composites with the diisocyanates as compatibilizer were fabricated by extrusion and injection
molding. The influence of different diisocyanates and various diisocyanate content on the mechanical
properties and thermal properties of the composites was investigated. The presence of the
diisocyanates in the composites lead to the improvements in mechanical properties and thermal properties
of the composites. The morphologies of fracture surface using scanning electron microscopy (SEM)
provided evidence of improved interfacial adhesion between ramie and PLA from the addition of the
diisocyanates. The composites containing isophorone diisocyanate (IPDI) showed the best mechanical
properties. The comparison of various IPDI content showed that the composites with 1.5% IPDI could
get the optimum mechanical properties, and the excess diisocyanate content resulted in the decrease
in the mechanical properties of the composites. However, IPDI content had almost no effect on the crystallization
and melting behavior of the ramie/PLA composites