Abstract
Biopolymer/chitosan/silan composite was sensitized in four form by conjugating of chitosan with different biopoly-mer compounds namely, β-Cyclodextrin (β-CD), Arabic gum, Guar gum and Pullulan in presence of 3-glycidoxypropyltrimethoxysilan (GPTMS) as a cross-linker. Characterisation of the prepared composites have been done through some measurements. FT-IR confirmed the chemical reactions and between biopolymers, chitosan and GPTMS. TEM and particle size confirm that, the particles are in small size ranged from 20 - 200 µm and have porous structure. Tex-tural properties of the prepared composites were studied and provide that, the microgel with pullulan have the best texture properties than other gels, and gel with guar gum have a worst texture properties. The effect of temperature on average diam-eter of prepared microgels were studied at different pH. The flow properties of the chitosan based microgels at different con-centration and different temperature were also determined. Treated fabrics with chitosan-based microgels were characterized for their morphological structure, antibacterial properties, water uptake for untreated and treated fabrics at different pH and temperature and it is confirmed that, the prepared composites impart a hydrophobicity property to the cotton fabrics.
Highlights
Cellulose is a natural polymer (Mohamed and Hassabo, 2015; Visakh and Arao, 2015) and it is useful to functionalize it to impart additional properties
Studding the pH effect found that, the microgels particle size was changing with increasing/decreasing the temperature.The results show that microgels are swollen at 25 C and have diameter average 190, 150, 195 and 180 μm, while at 40 °C the particles having average size 110, 25, 115 and 95 μm for pullulan, -cyclodextrin, Arabic gum and guar gum respectively
On the other hand, when the temperature was in the study run, at low temperature, the viscosity of the microgel can be arranged as follow: -cyclodextrin > pullulan >Arabic gum > guar gum
Summary
Cellulose is a natural polymer (Mohamed and Hassabo, 2015; Visakh and Arao, 2015) and it is useful to functionalize it to impart additional properties. Pullulan containing materials with biocide agents have a good antibacterial properties (Gniewosz and Synowiec, 2011). Guar gum is a non-ionic, branched chain polymer, consisting of a mannose units joined by β-D (1–4) linkages with branched α-Dgalactopyranose units joined by (1–6) linkages Presence of epoxysilanes such as 3glycidylpropyloxytrimethoxysilan (GPTMS) on the surface of cotton cause increasing of the coating properties and enhancing the mechanical stability. Prepared composite will reacted with GPTMS to be act as cross-linker This composite willim part many properties to the surface such as antibacterial, temperature and pH–responsive. Added to 10 ml Chitosan based microgels dispersion, stirred for 15 min (5 × 5 cm) washed cotton fabric were dipped in the reaction mixture for 10 min and padded (with 100% pick-up) using laboratory padder.
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