DIELECTRIC LOSS TANGENT OF ALKALI TREATED JUTE WOVEN FABRICS: EFFECT OF HEMICELLULOSES CONTENT

Abstract

The jute woven fabric was treated with sodium hydroxide at room temperature for 5, 30 and 45 min in order to obtain jute fabric with different hemicelluloses content and to study their influence on the dielectric loss tangent. After the alkali treatments, as the result of the hemicelluloses removal, the moisture sorption of the jute fabrics increased. The X-ray diffraction analysis shows that the jute fabrics with lower hemicelluloses content have a lower crystallinity index, which slightly increased after the intensive hemicelluloses removal. These results are in a good agreement with the results obtained for dielectric loss tangent measured at 30% and 80% relative air humidity.

Tkanina od jute je tretirana sa natrijum-hidroksidom na sobnoj temperaturi u toku 5, 30 i 45 min u cilju dobijanja tkanina od jute sa različitim sadržajem hemiceluloza i proučavanja njihovog uticaja na tangens dielektričnih gubitaka. Nakon alkalnih tretmana, kao rezultat uklanjanja hemiceluloza, sorpcija vlage se povećava. Analiza rezultata dobijena rendgenskom difrakcijom pokazuje da tkanine sa manjim sadržajem hemiceluloza imaju manji indeks kristalnosti, koji se malo povećava nakon intenzivnog uklanjanja hemiceluloza. Dobijeni rezultati su u saglasnosti sa rezultatima dobijenim za tangens dielektričnih gubitaka merenim pri 30% i 80% relativne vlažnosti.