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Polymer Science Gowariker 11.pdf
chitosan, a versatile biopolymer, finds numerous applications in textile processing unit operations such as preparation, dyeing, printing, and finishing. however, the accessibility of this biopolymer by the textile material depends on the viscosity of its solution which in turn is a function of its molecular weight. in this work, therefore, the effect of molecular weight, storage life, presence of electrolyte, and particle size of chitosan on its viscosity was investigated. chitosan of different molecular weights was synthesized by nitrous acid hydrolysis of parent chitosan solution. the synthesized low molecular weight products were analysed by ftir spectroscopy. chitosan of nanoconfiguration was prepared by ionotropic gelation method and characterized by particle size analyzer. the viscosity of different chitosan solutions was determined using ubbelohde capillary viscometer. as an extension to this study, the chelation property of chitosan was also evaluated.
the field of green chemistry emphasizes the avoidance of hazards for human health and the environment. in the paper, green chemistry is introduced with some references and brief information on the green chemistry concept and green chemistry practices. detailed description of the green chemistry concepts such as operational, chemical, and design concepts are presented and their relations with the green chemistry practices are also discussed. the green chemistry practices and concepts are demonstrated in practice with the examples of a novel biodegradable polymer and the green synthesis of green organic dyes. in this review, green chemistry approaches and technologies are presented to help researchers in their studies and research for future sustainable development.
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