Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Comparative investigations on the efficiency of different anchoring chemicals for the permanent finishing of cotton with chitosan

Sharaf S., Opwis K., Knittel D., Gutmann J. S.

Autex Research Journal

2011

Vol. 11, no. 2

71--77

Comparative studies on the efficiency of anchor molecules for the finishing of cotton with chitosan are presented. Four different anchors were used: cyanuric chloride (CNC), butane-1,2,3,4-tetracarboxylic acid (BTCA), glycidyloxypropyltrimethoxysilane (GPTMS) and sodium hydroxydichlorotriazine (Na-HDCT). Two types of chitosan with different molecular weights were used. The type of anchor used for fixation of chitosan on cotton fabric had a distinct effect on the antimicrobial efficiency of chitosan. By using increasing the concentration of anchor chemicals, the ability of chitosan to inhibit the growth of bacteria increased. Using GPTMS as an anchor for chitosan improved the ion binding capacity for Cu2+-ions more than other anchors. The highest colour strength was achieved when using a low amount of anchors from the chlorotriazine system (up to K/S 3.3), whereas carboxylic or trialkoxysilane anchors at the same ratio of anchoring chemical to glucose units achieved comparatively low K/S values. The polyelectrolyte values of treated cotton fabric were also measured. SEM was used to investigate the surface morphology of the treated cotton fabric samples.

Modification of styrene-isoprene-styrene triblock copolymer with a core-shell filler

Jakuczek L., Gutmann J. S., Herrmann Ch., Żuchowska D.

Polimery

2008

T. 53, nr 11-12

888-892

Mechanical properties of composite materials based on triblock poly(styrene-b-isoprene-b-styrene) copolymers (SIS) and modified with two different grades of core-shell fillers (core - silsesquioxane microgel, shell - grafted polystyrene, particle diameters 15.7 and 17.7nm, respectively). Significant improvement - almost 60% increase in tensile strength, relative elongation at break reaching 700% - was observed in case of a high molecular weight (Mw) copolymer at the maximal filler concentration of about 2 wt. % and longer chains of the polystyrene-shell. The rheological properties of nanocomposites differed with respect to the non-modified copolymer - softening of the material at higher temperatures was noticed.

Zbadano właściwości mechaniczne kompozytów trójblokowych kopolimerów poli(styren-b-izopren-b-styren) (SIS) modyfikowanych dwoma różnymi napełniaczami o strukturze rdzeń-otoczka (rdzeń - mikrożel polisilseskwioksanowy, powłoka - zaszczepiony polistyren, średnice nanocząstek, odpowiednio 15,7 lub 17,7nm). Zaobserwowano poprawę właściwości badanych materiałów na skutek napełniania, zwłaszcza w przypadku kopolimerów o dużym ciężarze cząsteczkowym (Mw) (tabela 1), zawartości napełniacza nieprzekraczającej 2 % mas. i dłuższych łańcuchach w polistyrenowej otoczce (tabela 3, rys. 1 i 2). Stwierdzono wystąpienie różnic we właściwościach reologicznych nanokompozytów w stosunku do wyjściowych kopolimerów (rys. 3). W podwyższonej temperaturze zaobserwowano mięknienie materiału.