Modification of cellulose permolecular structure in the process of beating

Abstract

Beating of fibrous materials in water environment is one of the most important processes in the technology of manufacturing both paper and cardboard. The degree of beating determines basic properties of the received kinds of paper and cardboard. The work dwells upon the permolecular structure of cellulose and its change in the process of beating. The methods applied here are ones: infrared spectroscopy, X-ray structure analysis, electronic microscopy and nuclear-magnetic resonance. All samples of the chosen materials with a degree of beating equal to 14, 19, 24 and 32°SR are investigated. With the purpose of preventing recrystallization of the ground cellulose drying cellulose was engaged with toluol with subsequent drying at 293°K. The conditions of engaging were picked up experimentally. With the help of X-ray structure analysis the basic parameters of an elementary cell of cellulose were determined and the ’’index crystallinity” for each kind of cellulose of a various degree is calculated. The received spectra have confirmed, that in process of beating the quantity of liquid-like phase increases and the quantity of crystal phase decreases which is, probably, connected with infringement of regulations in the arrangement of circuits in fibre cellular construction.