The modification of polypropylene fibres (POP) and POP fleece prepared by preirradiation technique is discussed. Grafting measure, hydrophility change and dyeing ability of the radiation modified samples were studied. The preirradiation and the simultaneous one were performed in a chamber type RCH-gamma-30 radiation equipment, having the emitters charge of60Co. For radiation-induced grafting 5–30% acrylic acid solution was used. It was proved that the percentage of irradiation-induced grafting of both POP fibres and POP fleece increased with an increase in the radiation dose and the concentration of acrylic acid. Samples modified by this technique have a good dyeing ability and their dyeing intensity increased parallel with the percentage of grafting.
This work is dealing with grafting of poly-propylene fibres /POP/ prepared by the pre-irradiation technique. A hydrophility change in irradited and modified samples was studied. Irradiation was performed in a chamber type RCH-gamma-30 radiation equipment, containing60Co. In the radiation modified samples of POP fibres prepared by the preirradiation technique the humidity adsorption increased from 0.1% to 0.56% after the radiation dose of 24.5 kGy has been used. The sorption properties of the samples were studied on McBeen balances with regard to temperature and water-vapour pressure.
Authors:J. Šandula, A. Ebringerová, and J. Pružinec
The solubility and the degree of degradation of water-insoluble particulate glucan isolated from Saccharomyces cerevisiae were studied after -irradiation. The different radiolytic stability of /1–3/-, /1–6/- and -glucan linkages of the complex polysaccharide can be used to achieve its fragmentation and provide a new insight to its macromolecular structure.
Authors:A. Ebringerová, M. Kačuráková, and J. Pružinec
Chemical and structural changes of two-insoluble heteroxylans of different origin after -irradiation treatment were studied by IR spectroscopy and sugar analysis of the obtained polymeric fractions. Radiolytic degradation in solid states was found to be an effective fragmentation method for structural analysis of complex insoluble polysaccharides.
Authors:A. Ebringerová, M. Kačuráková, Z. Hromádková, and J. Pružinec
The structural and solubility changes of a water-insoluble arabinoxylan with a low degree of branching was studied after -irradiation by IR spectroscopy and chemical analysis of the polysaccharide and its polymeric fractions.