Synthesis of Fluorinated Polyurethane/Polyacrylate Hybrid Emulsion Initiated by⁶⁰Co γ-Ray and Properties of the Latex Film

Abstract

Based on the solvent-free method, novel fluorinated polyurethane/polyacrylate hybrid emulsions, dodecafluoroheptyl methacrylate (DFMA) as fluorinated monomer, were successfully prepared via emulsion polymerization without traditional emulsifier. For the purpose of increasing the grafting ratio of polyurethane and polyacrylate, 60 Co γ -ray radiation polymerization had been adopted to enhance the hardness of latex film. The chain structure and polymerization progress were confirmed by the analysis of Fourier transform infrared spectroscopy. The grafting ratio of polymethyl methacrylate and polyurethane was obtained by calculating the ratio of N-H peak integral area and Ph(C=C) peak integral area. The effect of DFMA content on thermal stability, mechanical property and water resistance were investigated systematically by thermal weight loss analysis, tensile strength test, absorbed water ratio and water contact angle.

Polyurethane/Acrylic Hybrid Waterborne Dispersions: Synthesis, Properties and Applications

“…Due to a combination of environmental and economic reasons, solvent-free PU/acrylic hybrids have attracted increasing attention from academia and industry. ,− In this process, the acrylic monomers are used as solvents in the synthesis of the PU prepolymer, which allows the viscosity to be lowered sufficiently to allow for easy mechanical agitation during the dispersion step (see Scheme ). It should be noted most conventional PUDs utilize water miscible solvents such as n -methyl pyrrolidone, acetone and methyl ethyl ketone; therefore, the dispersion process using water insoluble acrylic monomers as solvents has significant differences that are yet to be fully understood.…”

Toward a Green Synthesis of Polyurethane/(Meth)acrylic Dispersions through Control of Colloidal Characteristics

“…The use of solvents can be avoided by synthesizing the PU containing ionic functional groups in bulk, dissolving in (meth)­acrylic monomers, and dispersing the mixture in water using high-shear devices. ,, However, in this case the molecular weight of the PU should be limited to control the viscosity and temperature of the reaction mixture during the bulk polymerization.…”