The use of modifiers in preparing transparent polycaproamide monofilaments

Conclusions The use of mixers of the centrifugal type, used in the manufacture of plastics, is a very efficient method of introducing modifiers into a polymer with the objective of obtaining transparent monofilaments.In the preparation of transparent filaments of small diameter, where the optimum modifier content does not exceed 0.5% by wt., it is advisable to introduce additives in the stage of polymer synthesis, particularly if the volume of filament manufacture is sufficiently great.Translated from Khimicheskie Volokna, No. 3, pp. 17–19, May–June, 1983.     

Structure features of transparent polyamide monofilaments

Conclusions The transparency of polyamide monfilaments is determined by the size of their supermolecular structures, Reduction in size causes an increase in transparency.Addition of materials which are crystallization retarders to the polyamide aids in the formation of a fine-grain structure.The effectiveness of additive action depends on its chemical structure and the diameter of the monofilament.Translated from Khimicheskie Volokna, No. 4, pp. 17–20, July–August, 1983.     

Structure and properties of dyed polypropylene yarn containing an addition of chemically colored low-molecular polycaproamide

Conclusions The thermal properties of PP yarns have been studied by determining their weight loss on heating. It has been shown that, by comparison with unmodified PP yarn, yarns containing an addition of chemically dyed LMPCA have improved thermal stability.Addition of chemically dyed LMPCA in the spinning of PP yarn leads to an increase in mean crystallinity and a decrease in the average size of yarn crystallites after jet stretch. The existence of two morphological forms of supermolecular structure has been shown by the electron microscopy method: spherulitic and oriented along the yarn axis.Translated from Khimicheskie Volokna, No. 6, pp. 20–21, November–December, 1986.     

Modification of polycaproamide fibres with ethoxylated compounds. Preparation of polycaproamide with antistatic properties

Conclusions The possibility of using diethylenetriamine which has been ethoxylated to various degrees to give antistatic properties to PCA has been discussed; the antistatic effect is expressed most strongly in the case of DETA 60.It has been found that the antistatics studied exert a regulating action on the degree of polymerization of the -caprolactam, displayed in a decrease in the molecular weight of the PCA and an increase in the LMC content of the polymer. This brought about by the fact that the products examined contain, even though in slight amounts, free amino groups. DETA 100 exerts the weakest action.Under otherwise equal conditions in PCA synthesis, the introduction of DETA increase the rate of polymerization in the initial stage of the process.In view of the effects described, it is advisable, in preparing PCA fibres, to use products which contain 60 to 80 moles of ethylene oxide.Bulgaria. Translated from Khimicheskie Volokna, No. 1, pp. 42–44, January–February, 1984.     

Physicomechanical and spectral properties of modified fibre-forming polycaproamide

Conclusions The physicomechanical characteristics of fibre based on polycaproamide which has been modified at the synthesis stage with 1–5% by wt. of sodium 4,4-diaminostilbene-2,2-disulfonic acid have been investigated.Spectral-luminescent properties of solutions and films of the modified polycaproamide have been described.An evaluation of the ability of two types of dye to dye the modified polycaproamide fibres has been carried out, and it has been found that the introduction of diaminostilbene fragments helps raise the dyeability of the fibres with basic cationic golden-yellow 2K.Translated from Khimicheskie Volokna, No. 6, pp. 38–39, November–December, 1987.     

Sorptive properties of polycaproamide fibres containing antistats

Conclusions Modification of polycaproamide fibres with ethoxylated amines increases free volume and the combinatorial entropy of the polymer.The indicated changes in fibre structure cause an increase in their hygroscopicity.Bulgaria. Translated from Khimicheskie Volokna, No. 4, pp. 55–56, July–August, 1984.     

Connection between diamagnetic and physicomechanical properties of fibres

Conclusions Measurement of the diamagnetic anisotropy of man-made fibres permits one, in a number of cases where fibre defectiveness does not play a decisive role, to evaluate their strength in extension.The interconnection between strength and diamagnetic anisotropy, in the general case, is caused by their identical dependence on the mean degree of molecular orientation of the fibre-forming polymer, and also on the character of the chemical bonds in the main chains.Translated from Khimicheskie Volokna, No. 6, pp. 23–24, November–December, 1989.     

Influence of plasticisers on the properties of polycaproamide

Conclusions 1. Arylsulphonamides added before polymerisation plasticise polycaproamide, lowering the viscosity of the melt in proportion to the amount of plasticiser added.2. It has been shown that it is better to add the plasticiser during the polymerisation of the -caprolactam and not in the remelting of the finished polymer.Kiev Branch of the All-Union Research Institute for Synthetic Fibres (VNIIV); VNIIV. Translated from Khimicheskie Volokna, No. 2, pp. 10–11, March–April, 1969.