Viscoelastic properties of alkyd ceramers

Abstract

ABSTRACT:The viscoelastic behavior of three alkyd ceramers was studied using dynamic mechanical thermal analysis (DMTA). A commercial product was compared to model alkyds. The model alkyds were prepared from phthalic anhydride, glycerol, and linseed or sunflower seed oil. Three sol-gel precursors, titanium tetra-i-propoxide, titanium di-i-propoxide diacetylacetonate, and zirconium tera-n-propoxide were investigated. The alkyd ceramers were evaluated as a function of both alkyd type and a sol-gel precursor content. The viscoelastic data showed that both EЈ and T g were affected by sol-gel precursor content. Both the crosslink density and T g demonstrated a minimum at low sol-gel precursor contents. After this minimum, both the crosslink density and the T g increased substantially.

Improvement of the mechanical properties of nano‐TiO2/poly(vinyl alcohol) composites by enhanced interaction between nanofiller and matrix

“…10 that the storage modulus increased with increasing temperature (above T g ), and the extent of increase was related to the COOH content in the composite, which was enhanced by increasing carboxylated TiO 2 loading or COOH content on the TiO 2 surface. A general explanation of this relationship is that as the temperature increases, the mobility of the reactive groups is enhanced, thereby resulting in the occurrence of more crosslinking reactions [41].…”

Durable graphene-based alkyd nanocomposites for surface coating applications

“…The reaction’s byproducts include monoglycerides, diglycerides, unconverted drying oil, and unreacted glycerol. Figure 6 shows an example of glycerol and soybean oil being transesterified [Sailer and Soucek 1999 ]. The mono-glyceride and a di-basic acid, for example phthalic anhydride, are directly esterified on the second stage, as depicted in Fig.…”

“…Alkyds can be divided into three categories: modified versus unmodified, oxidizing versus nonoxidizing, and oil length. Autoxidation is the process by which reacting alkyds, also denoted to as artificial drying-oils, crosslink when oxygen is present [Sailer and Soucek 1999 ]. Non-oxidizing alkyds are frequently utilized as resins with hydroxyl functions or as plasticizers.…”

Coatings

“…Recent studies of interest include the examination of binder content in latex paint films (35) and the determination of conversion at the gel point of powder paints (36). Dynamic mechanical analysis was also used to advantage for the characterization of polyurethane coatings (37) and alkyd ceramers (38).…”