remarksCharacterization of PPI reveals that this is a protein isolateconsisting of a wide variety of protein fractions showing dif-ferent molecular weights, where a significant amount of themare highly denatured, as indicated by its low solubility and lowcontent of free sulphydryls.Around 30–40% of the plasticizer (glycerol) has been foundto be required to obtain good processability of PPI/GL blendsto produce bioplastics. The excess of plasticizer occurringfor a lower protein/plasticizer ratio yields blends with toolow consistency for suitable processing and specimens show-ing glycerol exudation. On the other hand, increasing thisratio would produce some shear-induced crosslinking effectsleading to hardly processing blends and excessively brittlespecimens.A glass-like transition followed by a minimum in viscoelas-tic properties, prior to the onset of shear-induced crosslinkingeffects, has been found in PPI/GL blends. Both thermal eventsare considered useful to delimit suitable injection processingconditions.Within the aforementioned range, a higher PPI/GL ratioleads to an enhancement of the elastic bending and ten-sile properties of PPI/GL bioplastic specimens, as well astheir ability to absorb mechanical energy before ruptur-ing. It also improves water uptake, though to a lesserextent. On the other hand, the material becomes lesstransparent.Interestingly, considering their water uptake behaviour,these bioplastics show a fast absorption rate up to a very highcapacity, such that they can be considered potential resourcesfor the development of absorbent materials.From the overall results obtained, it is also appar-ent that PPI, being a by-product of the pea agroindustry,may be useful for producing bioplastics by means ofa thermo-mechanical process consisting in two stages(mixing and injection moulding), providing that suitableprocessing conditions are selected. In addition, accord-ing to their mechanical and physicochemical properties,PPI-based bioplastics, coming from renewable resources,can be regarded as promising candidates for the sub-stitution of conventional petroleum plastics in certainapplications