Lignosulfonates tensile strength

The enzyme concentration was not the rate-limiting factor in the system, because an increase of activity up to 1,000 U/mL did not lead to a higher tensile strength or a better water resistance. Currently, we are investigating several mixtures of less polar lignosulfonates and kraft lignins. Because these studies are being conducted cooperatively with an industrial partner, the results must be considered confidential at this time. 

Incorporation of low amounts (3-8%) of lignosulfonates into PO leads to a significant increase of the physicomechanical indices so the tensile strength is two times higher and elongation at break 6 times higher with respect to those of LDPE or IPP—Table 3. 

It can be concluded that water-reducing admixtures of the lignosulfonate and hydroxycarboxylic acid types will not alter the relationship between the compressive strength and the tensile and flexural strengths. 

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