Michal Krištofič

The DSC Study of PA 6, Polyamides and Copolyamides

The DSC method was used to obtain more information on changes of thermal properties connected with different comonomers bound in the (co)polymer chains. The copolyamides propered were block ones which were less crystalline and compatible with poly-ε-caprolactam. The results have confirmed the crystalline nature of polyamides and copolyamides.

Preparation, properties and application of modified fibers with piperazine rings

ABSTRACTWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW The paper is devoted to the preparation of copolyamidesfrom e-caprolactam with 6.1–24.5 wt% of the nylon saltof adipic acid and 1-(2-aminoethyl)piperazine. Molecularcharacteristics and thermal properties of the preparedcopolyamides have been studied.Fibers from copolyamides and blend fibers containingpolyamide 6 and copolyamides have been prepared andtheirpropertieshavebeenevaluated.Modifiedfibershavebetter electrical properties, higher sorption of watervapour, lower orientation factor and tensile strength andpractically the same elongation at break in comparisonwith non modified polyamide 6 fibers. Copyright 1999John Wiley & Sons, Ltd.KEYWORDS: copolyamide; e-caprolactam; adipic acid;1-(2-aminoethyl)piperazine; blended fibers

Modification of PP fibres with alkaline copolyamides

Copolyamides with 5.9-19.7 wt.% of nylon salt ADETA (adipic acid + diethylenetriamine) and 94.1-80.3 wt.% of e-caprolactam were synthesized and their properties were estimated. Blended polypropylene/ copolyamides fibres containing 5-15 wt.% of copolyamides were prepared and their properties were evaluated. The electrical properties, hydrophilicity and especially dyeability of modified PP fibres are positively influenced by a higher amount of the copolyamide in the PP and also by a higher amount of the nylon salt ADETA in the copolyamide.

Blended Polypropylene Fibers

The preparation, and especially the dyeability of blended fibers polypropylene and terpolymer acrylonitrile-butadiene-styrene and/or polypropylene and polystyrene, respectively are presented in this paper. Modified polypropylene fibers fix the dyestuffs much better and have lower tenacity according to the amount of the additive.