Thermal, hydrolytic, anticorrosive, and tribological properties of alkyd‐silicone hyperbranched resins with high solid content

Abstract

Novel alkyd hyperbranched resins (AHBRs) modified with a Z-6018 silicone (a polysiloxane intermediate) and with high solid content were synthesized by etherification reaction using an acid catalyst. Different molar ratios of AHBR to silicone were used. Structural, thermal, hydrolytic, anticorrosive, and tribological properties were studied using infrared (IR) analysis, nuclear magnetic resonance (NMR), vapor pressure osmometry (VPO), thermogravimetric analysis (TGA), acid value, electrochemical impedance spectroscopy (EIS), and pin-on-disk friction. IR and NMR provide evidence of grafting of the silicone on AHBR; the efficiency of grafting was quantified by TGA.Thermal stability was studied also by acid value analysis. Grafting increases the number average molecular mass, enhances thermal stability, and improves significantly hydrolytic stability. Corrosion resistance on steel is improved by two orders of magnitude, hence our modified materials can be used as highly effective anticorrosion coatings. Grafting lowers dynamic friction dramatically, more so at higher concentrations of silicone.

Waterborne hyperbranched alkyd-acrylic resin obtained by miniemulsion polymerization

“…These latters (the VOCs) are toxic, responsible for global warming and climate changes, and photochemical ozone layer deterioration [1] . Some alternatives have been adopted to obtain ecofriendly materials were, among others, waterborne coatings and hyperbranched polymers with high solid content are being developed for this purposes [1][2][3][4][5][6] .…”

Hyperbranched phenolic-alkyd resins with high solid content

“…The reaction of hydroxy-ester interchange produces two structures, one cyclic and another cyclic. This reaction was shown in the synthesis of waterborne hyperbranched acrylated-maleinized alkyd resins [28], alkyd-silicone hyperbranched nanoresins with high solid contents [29] and hyperbranched polyester polyols [35].…”

“…Attempts have been made to improve the hardness, thermal stability, chemical and corrosion resistance of hyperbranched alkyd resins, these have been hybridized with others compounds, such as acrylics [25][26][27], silicones [28,29], acrylated silicon [30], and melamine-formaldehyde [31]. Moreover, phenol has been used mainly in synthesis of phenolic resins, such as resole and novolak [32].…”

“…Therefore, the aim of the present study is to obtain new materials and evaluate the effect of the phenol contents on the structural, thermal, rheological and film properties of the HPARs. Furthermore, the properties of the hyperbranched alkyd resin (HBAR), synthesized in our earlier work employing the same HBP and TOFA contents and conditions of synthesis [21,22,28,29] will be compared with those of the HPARs.…”

Polyfunctional macromonomers obtained from 2,2‐bis(hydroxymethyl) propanoic acid and tall oil fatty acids

“…This material was obtained from renewable resources (wood pulp) . This material has been used in the synthesis of hyperbranched alkyd resins …”