IMPROVEMENT OF THE USE-VALUE OF POLYESTER-BASED FABRICS

The tendency to staining and the ability for stain retentivity of polyester fabrics can be decreased by basic treatment and tenside modification. The inflammability and risk of accidence of these textiles can also be reduced. This characteristic is also reflected in the rate of burning

MECHANISM OF CATIONIC LACTAM POLYMERIZATION

The authors suggested a new mechanism for the interpretation of cationic lactam polymerization according to which in the chain propagation reaction. through the appropriate intermediates. compounds belonging to various polymer homologous series are formed and additional polymerization processes are superimposed onto the original ones. On the basis of the new mechanism a kinetic model has been developed by the computer simulation of which rate and equilibrium constants could be determined. The latter enabled. a good quantitative description of polymerization

CHEMICAL MODIFICATION OF CELLULOSE

Thermolytic degradation of cellulose is dependant on its initial DP, accessibility and on the method and temperature of the treatment. A limiting DP could be detected in the depolymerizing reaction. The deteriorating action of aggressive water could be demonstrated. Quantitative correlation was elaborated concerning the role of accessibility in the reaction between cellulose and reactive dyestuffs. The role of temperature was cleared up in the ceIlulose-caustic soda interaction. New bleaching process was elaborated with the use of singlet oxygen. Physical characteristics, amount of releasable formaldehyde and colouristic influence of resin finishing of cotton could be optimized