Preparation And Properties Of Gelatin Gel Films With Multiple Stimulus Response

Stimulus response materials are one of the most important research contents in the preparation of sensors.Traditional stimulus-responsive materials have a single functional system and cannot meet current needs.Multiple stimulus-responsive materials are widely used in various fields because of their flexibility,convenient handling,and strong bionic functions.Diacetylene is a conjugated material,and its polymer is a new type of multiple stimulus response material,which has attracted a large number of researchers due to its special optical properties.Diacetylene polymer(PDA)is in the form of micellar particles,which can be combined with gelatin to prepare a stimulus-response gel system with good biocompatibility,strong plasticity,and environmentally friendly.The system will change from colorless to colorless under ultraviolet light.blue.This research experiment shows that the blue PDA gel system has dual stimulus response characteristics of temperature and pH.At the same time,PDA micellar gel is laid on the PDMS micro-array structure film to form a composite membrane structure.Experiments show that the composite membrane structure inherits the stimulus response characteristics of PDA gel,and at the same time has better flexibility,and can be applied to complex and diverse applications.Production environment.Specifically,this research topic can be divided into the following parts.In the first part of this article,firstly,the diacetylene monomer is made into a polydiacetylene(PDA)polymer micelle structure through chemical self-assembly,and the polymer structure is characterized,and its diameter and appearance characteristics are explored.Then,using the PDA micellar solution that has been turned blue by ultraviolet light,the stimulus response experiments such as temperature change,alkalinity increase,and acidity increase of the blue PDA micellar aqueous solution are studied.Finally,use ultraviolet absorption spectrum and fluorescence spectrum to analyze the experimental results.The experimental analysis results show that the blue PDA micellar aqueous solution has dual stimulus response characteristics of temperature and pH.In the second part of this article,the PDA micelle solution is mixed with gelatin to prepare PDA micellar gel.First,different amounts of gelatin were added to the PDA micelle aqueous solution to make a hydrogel system,and the appearance characteristics of the hydrogel system were observed after drying.The experimental results show that as the amount of gelatin added decreases,the gap of the corresponding hydrogel becomes larger.The experiment found that when 0.4 g of gelatin is added to 20 ml of PDA micelle solution,the gel system prepared under this amount of gelatin can become a solid It can keep the stimulating activity of PDA micelle particles,and has excellent experimental performance.Then use the PDA micellar gel that turns blue by ultraviolet light to study the response of the blue PDA micellar gel with increasing temperature and alkaline environment stimuli;as well as the plasticity test and cytotoxicity test of the PDA micellar gel.Finally,the results of the stimulus response experiment were analyzed by testing the ultraviolet absorption spectrum and the fluorescence spectrum.Comprehensive experimental results prove that PDA micellar gel has plasticity,biocompatibility,and response to temperature and pH dual stimuli.In the third part of this article,due to the poor mechanical properties of the PDA micellar gel system,it is necessary to design the carrier to improve its performance and expand the application field of the gel.In this experiment,the BOSCH process was first used to design and fabricate a silicon template with a surface array structure.Then the silicon template was used as a mold,and polydimethylsiloxane(PDMS)polymer was injected on it to prepare a PDMS film with an array structure,and the thickness of the film was controlled by spin coating while studying The influence of spin coating process(rotation speed and rotation time)on the thickness of PDMS film is discussed.Afterwards,the PDMS film with the array structure and the PDA micellar gel were composited into a film using the above spin coating process,and the temperature and pH stimulus response characteristics of the composite film were tested by ultraviolet light experiments.Finally,the experiments were performed by testing the ultraviolet absorption spectrum and the fluorescence spectrum Analysis of the results,the experimental results prove that the composite film has flexibility and response characteristics to temperature and pH dual stimulation.