Construction And Performance Characterization Of Cyclodextrin-based Vesicle System

At present,on the basis of satisfying people’s warmth,it is necessary to endue textiles with more new values and functions,such as aesthetic feeling,fragrance and health care.However,its application is limited due to its hydrophobicity,high volatility,poor stability to light and heat,and water insolubility of dyes.Microencapsulation technology has been widely used in many fields such as food,dyeing and finishing,coatings and biotechnology,which can effectively improve the physical properties of substances and improve their stability.Firstly,the self-assembly of epoxy-β-cyclodextrin(EP-β-CD)and mixed anionic/cationic surfactant system(SDS/DTAB)in aqueous solution was studied in this study,using the vesicle system as an encapsulated double substance.The delivery carrier of the two kinds of hydrophobic substances(lavender essence and dye indigo)was simultaneously encapsulated to form doubleencapsulated microcapsules,the particle size was 617±2.10 nm,and the loading of the two substances was 10% and 9.73%,respectively.Among them,lavender essence mainly exists in the bilayer of vesicles,while indigo exists in both the inner cavity and part of the bilayer of vesicles.The characterization of vesicles shows that they can promote the rapid growth and aggregation of crystals.Secondly,by studying the mechanism of temperature-induced morphological transformation of supramolecular aggregates,understanding the process of supramolecular assembly provides a good basis for the development of transport carriers.It was found that that the self-assembled supramolecules would self-assemble into worm-like micelles at lower temperatures,and would self-assemble into vesicles at higher temperatures.The dominant driving force is the hydrogen bond between EP-β-CD molecules,and the water molecule plays an important role in promoting the formation of vesicles.Finally,the doubleencapsulated microcapsules were applied to cotton fabrics.By elucidating the interaction types and adsorption kinetics of microcapsule and cotton fabrics without crosslinker,we can further understand the interaction mechanism between microcapsules and fibers.The experimental results verified that the double-encapsulated microcapsules were successfully adsorbed on the cotton fabric fiber,and the formation of intramolecular hydrogen bonds promoted its binding.The adsorption kinetics models(pseudo-first-order model,pseudo-second-order model,Bangham model and Weber&Morris intramolecular diffusion model)were used to illustrate that the adsorption behavior of the double-encapsulated microcapsules on the cotton fabric,which can be divided into three stages: rapid adsorption,saturation and final equilibrium.Through color fastness experiment,the cotton fabrics treated by double-encapsulation microcapsule had better color fastness.We hope that this research will benefit the development of functional cotton fabrics based materials.