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Chitosan Biopolymer (chitosan + biopolymer)

Distribution by Scientific Domains

Polymers and Materials Science	75%

Selected Abstracts

Forced Soft Lithography (FSL): Production of Micro- and Nanostructures in Thin Freestanding Sheets of Chitosan Biopolymer,

ADVANCED MATERIALS, Issue 21 2007
G. Fernandez
A "forced" soft lithography (FSL) technique is described for production of micro- and nanostructures into the surface of polymers at room temperature. The technique can be used with polymer/mould combinations that are unsuitable for conventional soft lithography, and has been used to structure the surface of the Chitosan biopolymer. Theoretical descriptions of the filling of the mould cavities and the possible formation of bubbles in the polymer are given. [source]

Pervaporation of tertiary butanol/water mixtures through chitosan membranes cross-linked with toluylene diisocyanate,

JOURNAL OF CHEMICAL TECHNOLOGY & BIOTECHNOLOGY, Issue 12 2005
Smitha Biduru
Abstract Membranes made from 84% deacetylated chitosan biopolymer were cross-linked by a novel method using 2,4-toluylene diisocyanate (TDI) and tested for the separation of t -butanol/water mixtures by pervaporation. The unmodified and cross-linked membranes were characterized by Fourier transform infra red (FTIR) spectroscopy, X-ray diffraction (XRD) studies and sorption studies in order to understand the polymer,liquid interactions and separation mechanisms. Thermal stability was analyzed by differential scanning calorimetry (DSC) and thermo gravimetric analysis (TGA) while tensile strength measurement was carried out to assess mechanical strength. The membrane appears to have good potential for breaking the aqueous azeotrope of 88.2 wt% t -butanol by giving a high selectivity of 620 and substantial water flux (0.38 kg m,2 hr,1). The effects of operating parameters such as feed composition, membrane thickness and permeate pressure on membrane performance were evaluated. Copyright © 2005 Society of Chemical Industry [source]

Synthesis and Characterization of Modified Chitosan Through Immobilization of Complexing Agents

MACROMOLECULAR SYMPOSIA, Issue 1 2005
Karin Cristiane Justi
Abstract Summary: The complexation agents 2[-bis-(pyridylmethyl)aminomethyl]-4-methyl-6-formyl-phenol (BPMAMFF) and 2-[2-(hydroxybenzyl)-2-(pyridylmethyl)aminomethyl]-4-methyl-6-formyl-phenol (HBPAMFF) were immobilized on chitosan biopolymer in order to obtain new adsorbent materials for metal ions. The chitosan derivatives were characterized by IR spectroscopy, DSC, TGA, and CHN analysis. The characterization study proved that the chitosan surface was chemically modified with both complexing agents and however, it is expected that these modifications improve the selectivity for metal ions specific in relation to the chitosan. [source]