"Compatibility of Modified Heracleum Sosnovskyi Cellulose-Based Material With Some Polymers "

Abstract

The aim of the present work was to investigate the compatibility prediction of Heracleum sosnovskyi plant material, modified with monoethanolamine (N→B)-trihydroxyborate, with organopolymer binders, such as polyvinyl acetate, polyurethane and casein. To achieve the goal, the following tasks were solved: first, the composition of the modified plant materials was studied and the degree of their antifungal resistance was determined; and then, the compatibility of the modified cellulosic material and organopolymer binders was predicted based on the calculation of the Hildebrand solubility parameter by determining the cohesive energy and the van der Waals volume of elementary bonds of the modified substrate. The investigation showed that the modification of plant raw materials results in the removal of the amorphous part of the lignin-carbohydrate complex of cell walls (lignin and hemicelluloses) from the substrate composition and chemical interaction of the modifier with secondary cellulose hydroxyls. This makes the plant material fully biostable and thus it can be used in the development of composite materials. The method of mutual solubility calculation can be used to predict the compatibility of the modified plant material with organopolymer binders. Based on this method, it was found that the best compatibility is observed when an excess of casein and polyurethane are used as binders for the modified cellulose-based material. Two formulations, namely casein (excess)-modified cellulose-based material and polyurethane (excess)-modified cellulose-based material, can be recommended for developing composites.

Modification of Cellulosic Materials with Boron-Nitrogen Compounds

“…If we specify the field of studies with natural fibers and, in particular, with wood fiber, cellulose is the main component (about 50% by mass), but in view of its crystalline structure, it is the least reactive component of the lignocarbohydrate complex (LCC) of wood. Therefore, initially, the possibility of chemical interaction of the obtained boronnitrogen modifiers with reactive groups of LCC was studied exactly on cellulose under "soft" modification conditions, and then the obtained experimental data were checked on wood [37,38]. The aim of the studies was to obtain reactive quadruple-coordinated boron-nitrogen compounds from commercially available boric acid and amino alcohols (mono-and diethanolamine) and to study the possibility of using the obtained boronnitrogen compounds for modifying cellulose and cellulose-bearing materials to improve the performance, bio-, and fire-protective properties of natural polymers.…”