High-strength cellulose-based nanocomposite temperature and pH dual stimuli-responsive gel and preparation method thereof

Abstract

The present invention relates to a preparation method of a high-strength and high-buffer POSS (polyhedral oligomeric silsesquioxane) hybridized polylactic acid foam material. The preparation method is characterized in that the foam material is prepared from main materials and auxiliary materials by compounding; the main materials comprise hydroxyl-terminated polylactic acid, thermoplastic polyurethane elastomer and polylactic acid; and the auxiliary materials comprise a compatibilizing agent such as eight-arm maleamic acid-based cage-like silsesquioxane, a condensation catalyst such as tetrabutyl titanate, as well as an antioxidant, a plasticizer, and an anti-UV agent. In the main materials, the mass ratio of the hydroxyl-terminated polylactic acid is between 45% and 65%, the mass ratio of the thermoplastic polyurethane elastomer is between 10% and 25%, and the mass ratio of polylactic acid is between 20% and 30%. In the auxiliary materials, the using amount of the compatibilizing agent such as eight-arm maleamic acid-based cage-like silsesquioxane accounts for 3.5%-6% of the mass of the hydroxyl-terminated polylactic acid in the main materials, the using amount of the condensation catalysts such as tetrabutyl titanate accounts for 0.5%-1.5% of the mass of the hydroxyl-terminated polylactic acid in the main materials, and the mass percentages of the antioxidant, the plasticizer, and the anti-UV agent all account for 1%-2% of the mass of the main materials. The foam material is prepared by adopting vapor extrusion foaming, and the process is simple. The material has good strength and buffer property, and is applicable to the fields of packaging and industry with requirements of high strength and high buffer property.

Description

technical field [0001] The invention belongs to a preparation method of a cellulose-based hydrogel, in particular to a preparation method of a hydrogel which has high strength and can realize rapid reversible response to temperature and pH value changes. Background technique [0002] Polymer gel refers to a system composed of a three-dimensional network structure of polymer compounds and a solvent, in which the polymers are connected by van der Waals force, chemical bond force, physical winding force, hydrogen bond force, etc. Since it is a three-dimensional network structure, it cannot be dissolved by solvents, and at the same time, it can be dispersed in solvents and can maintain a certain shape. Although the solvent cannot dissolve the polymer with a three-dimensional network structure, the solvophilic group in the polymer compound can be affected by the solvent to swell the polymer, which is also the reason for the formation of a polymer gel. Responsive polymer gel ...

AI Technical Summary

Problems solved by technology

On the whole, although natural macromolecular gel systems have been developed and have various functions, they still have some common defects as tissue engineering and drug sustained-release materials, such as generally weak mechanical properties, low responsiveness, and inability to fully integrate with the human environment. fit, and the performance deteriorates with the degradation, etc. For these common defects, some researches have been done to improve them

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