Core-shell Type Of Dendritic Polymers Synthesis And Optical Properties Of The Research

Dendrimers are a new class of functional polymers, with a large number offunctional groups, molecular memory in the cavity and controllable molecular chaingrowth characteristics. Dendrimers unique molecular structure and physical andchemical properties, so that in many areas have a wide range of applications, andquickly developed into a research hotspot. In this paper, the synthesis and related opticalproperties of new dendrimers were studied.Ethylenediamine and methyl acrylate as raw material, methanol as solvent, thereaction temperature is25oC, the reaction time was24h under the conditions byMichael addition reaction and condensation reaction of amidation different algebraicsynthesized polyamide-amine tree polymer. Polyamide-amine dendrimers infraredspectroscopy, nuclear magnetic resonance spectra. Solubilization experiments showpolyamide-amine dendrimers for acid insoluble guest molecules with solubilization.Under the same conditions, the generation of polyamide3.5-amine dendrimer andsodium dodecyl sulfate (SDS) micelles guest molecule solubilizing acid wererespectively8.57mg/mL,3.10mg/mL, polyamide-amine dendrimer solubilizationcapacity for benzoic acid is about3times the SDS.Using1-naphthyl amine and methyl acrylate and ethylene diamine as a rawmaterial, sodium methoxide as a catalyst at a reaction temperature of30oC, the reactionconditions for24h, the reaction by the Michael addition reaction and the synthesis ofthe amide type Generation naphthylamine nuclear polyamide-amine dendrimer. Thispolymer was characterized by IR and NMR. By fluorescence spectroscopy showed,G4.0naphthalene nucleus polyamide amine-amine dendrimer having a maximum peakof the fluorescence emission449nm, emission wavelength range of410~456nm,relative to the polyamide G4.0-maximum peak amine dendrimer fluorescence emission366nm, the maximum emission peak occurred redshift. Conjugate naphthalene ringstructure can result in the fluorescence emission spectrum of the polymer red shift.Pyrene, succinic anhydride was synthesized formyl acid pyrene, pyrene formylacid production using the Huang-Minlon reduction pyrene butyric acid, and carboxylicacid chloride sequentially through amidation reaction, a condensation reaction withmethyl acrylate pyrene can be synthesized G0.5core polyamide-amine dendrimers,then ethylenediamine as raw material. Finally synthesized G4.0pyrene as the core ofpolyamide-amine dendrimers and polymers were the IR and NMR spectra. G4.0pyrene fluorescence analysis at the core of polyamide-amine dendrimers, fluorescenceemission wavelength longer wavelength region tends redshift (505~588nm), thefluorescence is better.Benzoyl chloride can be preferably modified polyamide-amine dendrimer whoseterminal amine. Characterized by IR and1HNMR confirmed the correctnessG4.0PAMAM-benzoyl chloride polymer structure. Thermogravimetric analysis of thesynthesized products were shown to have good thermal decomposition curves. AgainstG4.0PAMAM-benzoyl chloride polymers and G4.0PAMAM fluorescence analysisfound that, G4.0PAMAM-benzoyl chloride emission peak position has undergone anobvious red shift, to move from366nm at481nm red.Chlorogenic acid modified using modified G4.0PAMAM dendrimers, G4.0PAMAM dendrimers nuclear naphthalene and pyrene nuclear G4.0PAMAM dendrimers. By NMR analysis, G4.0PAMAM dendrimers, G4.0PAMAMdendrimers naphthalene nucleus, G4.0PAMAM dendrimers nuclear pyrene can bebetter graft chlorogenic acid. Fluorescence spectroscopy proves, G4.0PAMAM-chlorogenic acid dendrimers, G4.0PAMAM-naphthalene nucleus chlorogenic aciddendrimers and G4.0dendrimer three kinds of raw acid pyrene nuclear PAMAM-Greenthe maximum absorption peak of the material were372nm,489nm,557nm.The main fluorescence intensity of the polymer contained in the conjugated groupson the conjugated system helps red shift of the fluorescence. Chlorogenic acidmolecules of chlorogenic acid dendrimers containing the modified more active groupsand special functions, and because these types of core-shell polymer has the advantageof a variety of tree-cavity structure, so the modified performance advantage willdendrimers.