Abstract
The hydrophilic/hydrophobic organoclays with varying quaternary ammonium substituents (QAS) were successfully synthesized and used as filler in unsaturated polyester (UPE) resin-organoclay nanocomposites to enhance mechanical properties. The organoclay-BQASMMT18 (octadecyldimethylbenzylammonium bromide modified montmorillonite) with only 3 wt% in the UPE enhanced tensile strength, tensile modulus, flexural strength and elongation at break by the order of 4.6, 2.4, 2 and 2.4, respectively compared to the pristine UPE. The tensile strength and hardness of the UPE-organoclay nanocomposites were increased with increase in organoclay content in the nanocomposites. However, the tensile and flexural strength decreased with increased loading of BQASMMT18 from 3% to 5 wt% due to less dispersibility of organoclay in nanocomposites. Moreover, dispersibility of hydrophobic organoclays in UPE nanocomposite is higher with respect of hydrophilic and pristine clay.
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