The Property Of N-2-hydroxypropyl-3-trimethylammonium Chloride Chitosan/biopolysaccharide System Solution

Chitosan,the deacetylated product of chitin,is the highest alkaline polysaccharide and the second most abundant biological polysaccharide in nature,which has good biocompatible,biodegradable,hydrophilic,antimicrobial resistance and so on.It has been widely used in biomedical,food packaging,and environmental protection.In this paper,N-?2-hydroxy?-propyl-3-trimethylammonium chloride chitosan was prepared.The main conclusions are as follows:1.Review of the properties of chitosan and its derivatives.In this section,we describe the solutions properties of Chitosan and its derivatives,common modification methods,its applications and put forward the main content and significance of this thesis project.2.HTCC was synthesized through a homogeneous reaction of 2,3-epoxy propyl trimethyl ammonium chloride and CS in 1-allyl-3-methyl chloride imidazole ionic liquids.preparation and rheological properties of the N-2-hydroxypropyl-3-trimethyl ammonium chloride chitosan?HTCC?.The effects of HTCC concentration,temperature,and concentration of inorganic salt,and degree of substitution?DS?on the rheological properties of HTCC were investigated.The variation of HTCC molecular construction under different inorganic salt conditions was confirmed by scanning electron microscopy and atomic force microscope.The results of rheological test show that the HTCC solution presents the shear dilutability,which is pseudoplastic fluid,the elastic modulus is greater than the viscosity modulus,and has the weak gel property.3.RheologicalpropertiesofHTCC/Sodiumcarboxymethylcellulose solution?CMC?on film forming.The effects of the different ratio of HTCC/CMC,temperature and substitution degree on mixed solutions rheology were investigated.The HTCC/CMC film forming solutions?FFSs?showed shear thinning behavior and typical pseudo-plasticity.The HTCC/CMC?10.0%?FFS appeared the highest apparent viscosity at steady shear behavior and lowest crossover frequency at dynamic rheolotical characterization,which ascribed to the strongest intermolecule interaction between HTCC and CMC molecules,and the formation of entanglements.Temperature increased both on the intermolecular interaction and the molecular thermal motion of HTCC and CMC molecules.HTCC with high DS was prone to form entanglements with different confirmations together with CMC,increasing apparent viscosity remarkably.The tensile strength and elongation at break of HTCC/CMC?10.0%?film showed the highest reinforcing effect between HTCC and CMC molecules,which was confirmed by the results of Fourier transform infrared reflection analysis,thermal properties,dynamic-mechanical analysis and scanning electron microscope.4.The effects of N-[?2-Hydroxyl?-propyl-3-trimethyl ammonium]chitosan chloride?HTCC?with different degree of substitution?DS?on the physicochemical properties of sodium carboxymethyl cellulose?CMC?based films were investigated.Determination of the rheological properties showed that all the HTCC/sodium CMC film-forming solutions?FFSs?with different mass ratios exhibited shear-thinning behavior and typical pseudo-plasticity.In addition,the influence of temperature,additives?glycerol and polyvinyl alcohol?and pH indicator?anthocyanins?on the films forming solutions were studied as well.The intermolecular interactions between HTCC and CMC molecules and the structure of HTCC/CMC aggregates were considered to play a key role in both rheological properties of HTCC/CMC FFSs and physicochemical properties of HTCC/CMC films.The pure HTCC film,pure sodium CMC film and blend films were characterized by FTIR and scanning electron microscopy.5.Facile preparation of CaCO₃ with diversified patterns modulated by HTCC.Using a slow vapor diffusion method,controlling CaCO₃ particles.The influences of various concentrations of HTCC,Ca²⁺and Mg²⁺,temperature and aging time,on the properties of CaCO₃ particles were investigated.The CaCO₃ particles were characterized by scanning electron microscopy,transmission electron microscopy,powder X-ray diffraction,Fourier transform infraredspectroscopy and thermogravimetry analysismethods.It was found that the strong electrostatic attraction between HTCC and Ca²⁺,the intramolecular and intermolecular interactions between HTCC molecules played a key role in the crystallization of CaCO₃ with different morphologies and polymorphs.