“…Some of the types of isocyanates that have already been explored include m-isopropenyl-α,α-dimethylbenzyl isocyanate (m-TMI) grafting [Guo et al, 2013;Guo & Wang, 2008;Karmarkar et al, 2007], poly(methylene)-poly(phenyl) isocyanate (PMPPIC) [Pickering & Ji, 2004;Raj et al, 1990] and polybutadiene isocyanate (PBNCO) [Nourbakhsh et al, 2008] as well as diisocyanates such as toluene diisocyanate (TDI) [Raj et al, 1990] and methylene diphenol diisocyanate (MDI) [Raj et al, 1990], and polymethylene diphenyl diisocyanate (pMDI) [Geng et al, 2005;Thompson et al, 2010a]. In general, improvements in mechanical properties were observed in WF [Geng et al, 2005;Guo et al, 2013;Guo & Wang, 2008;Thompson et al, 2010a] and wood fibre [Karmarkar et al, 2007;Nourbakhsh et al, 2008;Raj et al, 1990] reinforced polymer composites after the addition of isocyanate reagents, predominantly in the tensile, flexural and impact strengths, but as well in improved water resistance. However, the use of the functionalising, not coupling, agent PMPPIC on pine wood fibre/PP composites produced no significant effect on strength [Pickering & Ji, 2004].…”