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Kebiskova J.,Trencianska Univerzita Alexandra Dubceka | Srokova I.,Trencianska Univerzita Alexandra Dubceka | Sasinkova V.,Chemicky ustav SAV
Vlakna a Textil | Year: 2013

Esterification was used for preparation of oleates of starch (O-S) and oleates of O-(carboxymethyl) starch (O-CMS) using native starch and carboxymethyl starch with oleoyl chloride in environment of pyridine, respective DMSO/pyridine and conventional or microwave heating was used. These oleates were subsequently characterized by FT-IR spectroscopy which was also used for determination of the degree of substitution (DS) of prepared esters. Oleates of starch were prepared with higher DS (from 0.8 to 1.8) while oleates of CMS were substituted in a negligible way. Prepared esters were soluble or partially soluble in water. The surface-active properties were evaluated, namely surface tension, critical micellar concentration and emulsifying efficiency. Derivatives did not decrease the surface tension of water and their emulsifying effect has been comparable or lower than the standard. The exception is oleate of CMS prepared by classical heating because this oleate decreases the surface tension to ∼ 41 mNm-1 and it also has a very good emulsifying effect. Utilization of MW heating during the preparation of derivatives starch and CMS is significant in both economic and environmental terms. Source

Uherkova S.,Trencianska Univerzita Alexandra Dubceka | Srokova I.,Trencianska Univerzita Alexandra Dubceka | Urban G.,Trencianska Univerzita Alexandra Dubceka
Vlakna a Textil | Year: 2011

Evaluation of the mechanical properties technical textiles used for production of the seat covers will be presented. From the mechanical properties were evaluated strength and ductility of stitch and yarn in technological process, as well as. Strength and ductility of technical textiles were evaluated by STN EN ISO norms. Source

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