Effect of dimethylaminoethyl methacrylate on the graft copolymerization of ethyl acrylate onto hydroxypropyl methylcellulose in aqueous medium

Abstract

Graft copolymerization of an ethyl acrylate (EA) and dimethylaminoethyl methacrylate (DMAEMA) monomer mixture onto water-soluble hydroxypropyl methylcellulose was investigated with potassium persulfate (KPS) as the initiator in an aqueous medium. The effects of introducing DMAEMA onto the graft copolymerization and the properties of the resulting latex that was produced were studied systematically. The optimum conditions for the graft copolymerization in terms of percentage of grafting and grafting efficiency were determined. The graft copolymer was characterized by Fourier transform infrared spectra, elemental analyses, nuclear magnetic resonance, transmission electron microscopy, and dynamic light scattering methods. The results suggest that the introduction of the DMAEMA monomer clearly accelerates the initial rate of the graft copolymerization, whereas the grafting parameters decrease significantly with increasing amounts of DMAEMA. These results can be attributed to the relatively large size of the DMAEMA molecule, its redox reaction with KPS, its hydrophilicity in water, and its chain transfer effect. The equilibrium humidity adsorption behavior and acid solubility of graft the copolymer films were also studied.

Photoluminescent Nanoinks with Multilevel Security for Quick Authentication of Encoded Optical Tags by Sunlight: Effective Physicochemical Parameters on Responsivity, Printability, and Brightness

“…In the next step, an aqueous solution of KPS was added to the reactor for initiation of copolymerization of the MMA and DMAEMA monomers. It should be pointed out that the polymerization reaction was performed at room temperature due to the redox reaction of KPS with tertiary amine groups of the DMAEMA, which resulted in the formation of free radicals and initiation of copolymerization at room temperature. , After completion of the polymerization reaction at a temperature of 80 °C, the solid content and also conversion of monomers to polymers were calculated using the methods reported in our previous studies, and the obtained results for all of the samples are presented in Table . ,, Differences in solid content and conversion for all of the samples are not significant and cannot be attributed to a specific reason or a parameter. As can be seen in Figure , the functional latex nanoparticles are composed of a PMMA-based hydrophobic core and a PDMAEMA-based hydrophilic corona.…”