Perspective for the use of eucalyptus cellulose in the production of composite materials for collecting biological samples

Abstract

The paper shows the possibility of using eucalyptus sulfate cellulose both as an independent fiber and in a mixture with coniferous when creating a cellulose composite material for collecting biological samples. The influence of the eucalyptus pulp grinding process on the physico-mechanical, structural and absorbent properties of the CСМ is shown. The study of the influence of eucalyptus cellulose on the physico-mechanical, structural and absorbent properties of handsheets has shown that the use of a different ratio of fibrous semi-finished products allows achieving a balance between the high physico-mechanical and absorbent properties of ССМ for collecting biological samples. Impregnation of the material with a lysing solution in accordance with FTA technology leads to a decrease in physical and mechanical properties by 60–70%, in absorbent properties by 12–15%. Due to changes in the capillary-porous structure, there is an increase in plumpness by 20–45% and air permeability by 75–85%, depending on the fiber composition and the degree of grinding of eucalyptus cellulose. Two ССМ compositions have been developed for the collection and storage of biomaterials: composition No.1 is a mixture of coniferous and eucalyptus cellulose with a refining degree of 17°SR, providing high absorbency and strength properties of CCM, which will ensure the collection of biological samples: softwood sulfate cellulose 75% – eucalyptus sulfate cellulose 25%; composition No.2 is a mixture of coniferous and eucalyptus cellulose with a refining degree of 21°SR, providing higher physical and mechanical properties, but with lower absorbency and cost, which will ensure not only collection, but reliable storage and safe transportation of biological samples from anywhere in our country: softwood sulfate cellulose 50% – eucalyptus sulfate cellulose 50%.