| In recent years, self-assembled construction of the condensed state and its functional application in macromolecule-small molecule hybrid system induced by non-covalent bond attracted many researchers. This paper mainly focused on the structure of hydrogen bonded network and its influence on dynamic viscoelastic behavior, which establisded scientific basis for preparing light and high efficient water-based damping coatings.In the hybrid system with4,4’-thio-bis(3-methyl-6-t-butyl phenol) as small organic molecule(SOM) and ethyl acrylate homopolymer(PEA) as macromolecule, the hydrogen bonds were found to exist among them. The hydrogen bonding content was directly related to the dispersion state of SOM. The linear increasing relationship between Tg, TA and hydrogen bonding content indicated that damping improving effect indeed correlated with the opening and closing of hydrogen bonds. However, when the density of hydrogen bonded network raised to the state that each4-6structural units of PEA chains sharing one SOM molecule, SOM molecules began to aggregate and Tg of the mixtures stabilized gradually.In order to improve the dispersion state of the oil SOM in the water-based acrylate emulsion, the idea to emulsify SOM was proposed. Comparing with the solvent dispersion method, melt milling method and directly adding method, the dispersion state closed to the solvent method was obtained. With decreasing the particle size of SOM emulsion, the hyrogen bonding content, the values of lossing peak height and TA increased.A series of water-based damping coatings samples were prepared using the emulsion blending method. Effects of the composition and blending ratio on damping performance were investigated by cantilever method. The coating characteristic parameters analysed in this paper can provide basic datas to predict and evaluate the damping performances of the specimen with different thicknesses in practical application. |
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