Unsaturated polyester-clay slurry nanocomposites

Abstract

In this work, nanocomposites were produced with an unsaturated polyester resin and sodium montmorillonite (MMT) slurry. Upon increasing the clay content [from 1 to 5 parts per hundred resin (phr)] increments of 57 % and up to 120 % were found in the fl exural modulus, with respect to that of the resin alone. Using clay slurry, the cross-linking reaction was affected by the clay, in such a way that the gelation temperature and the thermal stability increased. Using transmission and scanning electron microscopy, resin intercalation into the MMT silicate layers was observed and the fracture morphology revealed the effect of the clay slurry on the nanocomposite morphology. Furthermore, shear and oscillatory rheological tests revealed the formation of a structure between resin and clay at low shear rates, and the presence of this structure was evidenced by X-ray photoelectron spectroscopy (XPS) measurements.

Glass Fiber Reinforced Unsaturated Polyester: Effect of Nanoclay and Mixing Time on Tensile Modulus, Flammability, and Wear Resistance

“…However, the moisture content may also increase clay viscosity and inhibit clay dispersion [18]. In addition, the moisture content may function as lubricant that reduces shear and interfacial bonding in composites [19,20]. These caused the low modulus for UDC samples.…”

Unsaturated polyester nanocomposites based on poly(ethylene terephthalate) waste using different types of nanofillers

“…It is quite evident from Figure 7 that among all nanocomposite samples, UPN5 and UPC1 exhibit the highest thermal stability and the lowest rate of mass loss when compared with UPL5 and pristine UP. Rivera-Gonzaga et al 26 reported that upon UP intercalation, increased interaction between UP and the clay surface may be induced through carboxylic groups in the chain ends as well as van der Waals interactions among the UP ester group and the clay surface. These interactions lead to decrease the mass loss rate and consequently to better thermal stability.…”

Physico‐mechanical properties of gamma‐irradiated clay/polyester nanocomposites

“…Jawahar et al demonstrated that nanocomposites with different clay contents exhibit an improvement of 85% in wear resistance and a decrease of 35% in the friction coefficient . On the other hand, the addition of montmorillonite particles into polyester resin reduced the coefficients of thermal expansion (CTE), bending and tensile testes revealed that higher percentages of montmorillonite induced higher Young's modulus . Numerous researchers have been reported that the addition of a nanoclay in amounts of 0.5–1% increases the viscosity of UP resin; whereas, the gel time and the degree of shrinking are decreased.…”