Abstract
Four waterborne hyperbranched alkyd-acrylic resins (HBRAA) were synthesized by miniemulsion polymerization from a hyperbranched alkyd resin (HBR), methyl methacrylate (MMA), butyl acrylate (BA) and acrylic acid (AA), by using benzoyl peroxide (BPO) and ammonium persulfate (AP) as initiators. The reaction between HBR and acrylic monomers was evidenced by differential scanning calorimetric (DSC), nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC). The conversion percentage, glass transition temperature (Tg), content of acrylic polymer (determined by soxhlet extraction) and molecular weight increased with the content of acrylic monomers used in the synthesis. The main structure formed during the synthesis was the HBRAA. The analysis by dynamic light scattering (DLS) showed that the particle size distribution of HBRAA2, HBRAA3 and HBRAA4 resins were mainly monomodal. The film properties (gloss, flexibility, adhesion and drying time) of the HBRAA were good.
Highlights
The use of renewable resources in the preparation of monomers has been only focused on materials synthesis various industrial materials has been revitalized due to the with the lowest branching degree[17,18,19,20,21,22].environmental concerns
In the nuclear magnetic resonance (NMR) spectra of the hyperbranched alkyd-acrylic resins (HBRAA), it can be observed that the signal of the protons of -HC=CH- bonds decreased its intensity with the increase of the acrylic monomers proportion in the synthesis
Different environmentally friendly HBRAA were obtained in this study, which contribute to the development of new materials
Summary
The use of renewable resources in the preparation of monomers has been only focused on materials synthesis various industrial materials has been revitalized due to the with the lowest branching degree[17,18,19,20,21,22]. There are two methods usually employed to synthesize (research) was conducted aiming to the reduction of volatile alkyd-acrylic resins, which are emulsion polymerization[22], organic compounds (VOCs)[1]. Hybrid waterborne alkyd-acrylic dispersions with solid content of 40 wt%, free from any surfactant and organic solvent, were synthesized by a melt co-condensation reaction between an acrylic prepolymer bearing carboxylic groups and an alkyd resin by a phase inversion process. Alkyd-acrylic resins were synthesized by emulsion polymerization and these materials presented a synergic effect[22]. The properties of these resins were better than alkyd-acrylic blends. The effects of acrylic monomers on the structural, thermal and film properties of HBRAA resins were studied
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