Study On The Preparation And Properties Of Fluorescent Acrylic Resin Based On Aggregation-induced Emission Mechanism

By modifying the traditional polymer resin,the coating has the function of anticorrosion and decoration.And it has real-time response to the stimulation of the external environment,so that it has monitoring performance.So researchers have done a lot of research.As a sensitive material,fluorescent materials can provide real-time responsive signals.It provides new ideas for the intellectualization of traditional coatings.This paper is based on Aggregation-Induced Emission.Polymer resin was modified by chemical copolymerization with fluorescence molecular.Due to the fixation and binding effect of polymer chain segments on fluorescence molecules,the fluorescence properties of cured coatings will respond in real time to the stimulation of polymers.Thus,the coating is endowed with new characteristics.The main contents and results of this paper are as follows.（1）The traditional organic-inorganic composite resin was functionalized by fluorescence molecular chemical modification with Aggregation-Induced Emission.Traditional organic-inorganic composite resin has excellent properties.Silica sol is a colloidal solution of silicic acid polymer.It has non-toxic,high hardness,good mechanical strength,good heat resistance and other characteristics.In this paper,the silane coupling agentγ-（2,3-epoxy propylene oxide）propyltrimethoxysilane was used as the bonding bridge.Fluorescence small molecule TPE-2CH₂NH₂ was chemically grafted onto the silica sol surface.The modified fluorescence silica sol was used as seed and acrylic emulsion was polymerized on the surface to form a shell.Finally,the organic-inorganic compound fluorescent emulsion was obtained.Based on the mechanism of intramolecular rotation limitation（RIR）,the changes in the internal structure of these polymers are directly manifested in the increase or decrease of fluorescence intensity of organic-inorganic composite resins and cured coatings.Therefore,the polymerization process,coating curing and water absorption process of organic-inorganic composite resin can be observed in real time.The experimental results in this chapter provide a simple method to study the relationship between the internal structure and the properties of polymer materials.And it has the potential to expand the practical application of the AIE phenomenon.（2）In this paper,self-crosslinking acrylic latex was studied and functionalized by fluorescence.When conventional acrylic latex solidifies into film,there is no chemical bond crosslinking between latex particles.Which belongs to thermoplastic coating film.It has poor water resistance,solvent resistance,anti-fouling ability,hardness and tensile strength.Self-crosslinking latex was prepared by DAAM and ADH.It can be automatically crosslinked into a three-dimensional network structure during the curing process.So that the mechanical properties and corrosion resistance of the coating can be significantly improved.In this study,fluorescence molecule TPE-2COOCHCH₂ with was copolymerized into self-crosslinked latex particles by free radical polymerization.The self-crosslinking latex and its coatings also have AIE effects.The results show that the preparation of self-crosslinking fluorescent latex and the change of its internal structure during curing can be studied by the change of fluorescence intensity.The dynamic detection of toluene and ammonia was realized by using the real-time response of fluorescence.（3）The structure and properties of acrylic resin with high solid content and low viscosity were studied by fluorescence.Traditional solvent-based acrylic resins have low solid content and abundant organic solvents.The solid content of acrylic resin prepared in this paper is up to 80%.However,because the polymer molecular weight is small,not used as a single component coating.Methyl methacrylate（MMA）,cyclohexyl acrylate（CAS）,2-ethylhexyl acrylate（2-EHA）,hydroxyethyl acrylate（HEA）and acrylic acid（AA）were used as copolymers.The fluorescence molecule TPE-2COOCHCH₂ with Aggregation-Induced Emission was copolymerized into acrylic resin by free radical polymerization.The results show that the preparation of acrylic resin and the change of its internal structure during curing can be studied by the change of fluorescence intensity.The real-time response of fluorescence was used to detect the ambient temperature and toluene.