Isododecane mixture of isomers

• CAS: 31807-55-3
• Catalog Number: ACM31807553
• Category: Alkanes
• Molecular Weight: 170.33
• Hazard Statements: H318
• RIDADR: NONH for all modes of transport
• Symbol: GHS05

Case Study

Rheological Properties of Amide Organogelators in Isododecane

Sakanishi, Yuichi, et al. Advances in Materials Physics and Chemistry, 2014, 4(12), 267.

Isododecane was chosen as the test fluid in this study because it is widely used as a hydrophobic solvent for cosmetics and hygiene products. The solubility and rheological properties of novel organogelators (butane 1,2,3,4-tetracarboxamides) with four chemical side chains were evaluated in the isododecane test fluid to explore the viscosity-increasing mechanism of these compounds.
Key Findings
· PMDA, containing two oleyl and two 2-ethylhexyl groups (Figure 4), demonstrated notable viscosity-enhancing effects in various hydrophobic fluids. In this investigation, the relative viscosity of a 0.5 wt% PMDA solution was measured at 2148 for isododecane at a shear rate of γ = 1 s^-1.
The viscoelastic characteristics of a 0.5 wt% solution of compound 5 and PMDA in isododecane are illustrated in Figure 5, revealing that the PMDA solution exhibits a prolonged relaxation time of several seconds.
· Figure 6 presents the strain dependence of G' for both compound 5 and PMDA. Although compound 5 exhibits a higher G' value at lower strains, it experiences a significant drop compared to PMDA. This indicates that the self-assembled structure of compound 5 is less stable than that of PMDA.
· The morphology of compound 5 was examined using TEM, and Figure 7(a) shows that it forms fibrous molecules with diameters of approximately 5-10 nm in isododecane. The presence of these small self-assembled structures likely contributes to the increased viscosity in isododecane. For comparative purposes, Figure 7(b) depicts the morphology of PMDA with similar alkyl side chains, indicating that compound 5 creates a finer network than PMDA.