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2 2011

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Modifcation of PA 6 Fibres with Bentonite, Cloisite and Concentrates (Copolyamide + Bentonite)

Krištofč M., Ujhelyiová A., Vassová I., Ryba J.

Fibres & Textiles in Eastern Europe

2011

Vol. 19, no. 1 (84)

24-29

This contribution outlines the preparation and properties of PA 6 fbres modifed with two types of montmorillonite - organophilic Bentonite 11958 or Cloisite 15A alone, as well as with concentrates consisting of copolyamides and Bentonite. The concentrates were synthesised with ?-caprolactam (CL) and two minor comonomers - nylon salts from adipic acid + diethylenetriamine (ADETA) and from adipic acid + 1-(2-aminoethyl) piperazine (AN2) in the presence of Bentonite. Three concentrates containing copolyamide from CL + 10.7 wt. %, 21.4 wt.% and 23.4 wt.% of minor comonomers + 5 wt.% of Bentonite were prepared. The basic properties of PA 6 and the concentrates were evaluated. Blends PA 6 + 10 - 50 wt.% of each concentrate, PA 6 + 0.25 - 2.5 wt.% of Bentonite and PA 6 + 0.25 - 5 wt.% of Cloisite were prepared, and the apparent viscosity of the blend melts with Bentonite was measured. Experimental PA 6 fbres modifed with Bentonite, Cloisite and the concentrates were prepared and drawn. The mechanical properties - tensile strength, elongation at break and Young's modulus of non-modifed and modifed PA 6 fbres were compared.

Functionalisation of Polypropylene. Part I. Mechanical, Electric and Sorptive Properties of PP Fibres Modifed with Concentrates Consisting of Copolyamides and Nanoclay

Krištofč M., Vassová I., Ujhelyiová A., Ryba J.

Fibres & Textiles in Eastern Europe

2011

Vol. 19, no. 2 (85)

18-22

Concentrates of copolyamides consisting of copolyamide (?-caprolactam + nylon salt of adipic acid and diethylenetriamine and nylon salt of 1-(2-aminoethyl) piperazine and adipic acid) and the nanoadditive Bentonite were prepared, characterised and used for the preparation of blend polypropylene (PP) fbres. PP fbres modifed with 4, 8 and 12 wt.% of the three types of concentrates prepared were spun without a compatibiliser by the standard melting process and drawn at three drawing ratios. Mechanical properties of the modifed PP fbres, i.e. tenacity and Young´s modulus, are better mainly at lower amounts of each concentrate and at higher drawing ratios. Te electric properties of the modifed PP fbres are positively infuenced by all three concentrates. Te higher their amount in the modifed PP fbres, the better the electrostatic properties. Te sorptive properties of the modifed PP fbres, i.e. the sorption of water vapour and disperse dyestufs, are much better in comparison with non modifed PP fbres.